BlackTreeCVE Intelligence
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Full vulnerability report · 2019
CVE-2018-20843High confidence

Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP: Improper Restriction of XML External Entity Reference

Siemens · SIMATIC S7-1500 CPU 1518-4 PN/DP MFP

Official source article: Siemens SSA-398330 ↗. Check the applicable product and release in the original source.

7.5HighCVSS 3.1
Recommended action
Patch only the product branches with a verified fix

High technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance. Verified remediation exists for at least one product or source, but 6 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Fix availability varies by product
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityHighOperational priority:Critical, raised one band.upgradedsince 30 May 2025

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • A structured source references public exploit or proof-of-concept material.
  • The selected CVSS metric records a network-reachable, unauthenticated path with no user interaction.
  • EPSS is 7.11% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict the affected network interface to trusted sources where business-safe.
  • Increase monitoring for the attack path and post-exploitation behaviour described in the report.

Verification

  1. Confirm that the asset runs Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: Within 3 daysRemediation target: Within 90 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Cross-source reconciliation

Remediation availability differs by product scope

Verified remediation exists for at least one product or source, but 6 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Distribution package intelligence

Release-specific package status

Alpine, Debian, ubuntu findings are scoped to the named distribution, release and source package. An absent finding does not mean a package is unaffected.

13 package states
Package result overrides the generic status

BlackTree has verified remediation for at least one product or source, but the relevant distribution still reports no fixed package for 1 affected package state shown here. Treat those rows as affected with no fix until that distribution publishes a fixed version.

Repository candidate not checked

A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.

Distribution releaseSource packageVendor stateFixed versionEvidence
Alpine v3.23v3.23 · mainexpatVendor fix publishedAlpine records a security fix at this version. An absent entry does not mean the package is unaffected.2.2.7-r0Alpine Security Database ↗Source updated 23 Oct 2026
Alpine v3.22v3.22 · mainexpatVendor fix publishedAlpine records a security fix at this version. An absent entry does not mean the package is unaffected.2.2.7-r0Alpine Security Database ↗Source updated 23 Oct 2026
Alpine v3.21v3.21 · mainexpatVendor fix publishedAlpine records a security fix at this version. An absent entry does not mean the package is unaffected.2.2.7-r0Alpine Security Database ↗Source updated 23 Oct 2026
Debian trixietrixie · sourceexpatVendor fix publishedDebian records a fixed source-package version for this release.2.2.6-2Debian Security Tracker ↗Source updated 23 Oct 2026
Debian bookwormbookworm · sourceexpatVendor fix publishedDebian records a fixed source-package version for this release.2.2.6-2Debian Security Tracker ↗Source updated 23 Oct 2026
Debian bookwormbookworm · sourcelibxmltokAffected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 23 Oct 2026
Debian forkyforky · sourceexpatVendor fix publishedDebian records a fixed source-package version for this release.2.2.6-2Debian Security Tracker ↗Source updated 23 Oct 2026
Debian sidsid · sourceexpatVendor fix publishedDebian records a fixed source-package version for this release.2.2.6-2Debian Security Tracker ↗Source updated 23 Oct 2026
Ubuntu 24.04 LTSnoble · esm-appslibxmltokVendor fix publishedCanonical reports that a fixed source package version has been published. Repository candidate availability is not checked by BlackTree.1.2-4.1ubuntu2.24.0.4.1+esm2Canonical Ubuntu Security ↗Source updated 23 Oct 2026
Ubuntu 24.04 LTSnoble · esm-appsswish-eUnder evaluationCanonical reports that the package might be affected and still needs evaluation or fixing.Not published in this feedCanonical Ubuntu Security ↗Source updated 23 Oct 2026
Ubuntu 24.04 LTSnoble · esm-appsxmlrpc-cUnder evaluationCanonical reports that the package might be affected and still needs evaluation or fixing.Not published in this feedCanonical Ubuntu Security ↗Source updated 23 Oct 2026
Ubuntu 24.04 LTSnoble · standard archivecadaverUnder evaluationCanonical reports that the package might be affected and still needs evaluation or fixing.Not published in this feedCanonical Ubuntu Security ↗Source updated 23 Oct 2026
Ubuntu 24.04 LTSnoble · standard archivematanzaUnder evaluationCanonical reports that the package might be affected and still needs evaluation or fixing.Not published in this feedCanonical Ubuntu Security ↗Source updated 23 Oct 2026
Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

2 current · 1 archived
CVE-2018-20843 · CSAF 2.0 · revision 50 · interimSUSE Product Security TeamCVE-2018-20843
83 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • expat as component of HPE Helion OpenStack 8
  • libexpat1 as component of HPE Helion OpenStack 8
  • libexpat1-32bit as component of HPE Helion OpenStack 8
  • expat as component of SUSE Enterprise Storage 7
  • expat as component of SUSE Linux Enterprise High Performance Computing 12 SP2
  • libexpat1 as component of SUSE Linux Enterprise High Performance Computing 12 SP2
  • libexpat1-32bit as component of SUSE Linux Enterprise High Performance Computing 12 SP2
  • expat as component of SUSE Linux Enterprise High Performance Computing 12 SP4
  • libexpat1 as component of SUSE Linux Enterprise High Performance Computing 12 SP4
  • libexpat1-32bit as component of SUSE Linux Enterprise High Performance Computing 12 SP4
  • expat as component of SUSE Linux Enterprise High Performance Computing 12 SP5
  • libexpat1 as component of SUSE Linux Enterprise High Performance Computing 12 SP5
Summary
In libexpat in Expat before 2.2.7, XML input including XML names that contain a large number of colons could make the XML parser consume a high amount of RAM and CPU resources while processing (enough to be usable for denial-of-service attacks).
Remediation
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
SSA-398330 · CSAF 2.0 · revision 19 · interimSiemens ProductCERTCVE-2018-20843
5 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) >= V3.1.0 < V3.1.5
  • SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= V3.1.0 < V3.1.5
  • SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) >= V3.1.0 < V3.1.5
  • SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) >= V3.1.0 < V3.1.5
  • SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) >= V3.1.0 < V3.1.5
Summary
In libexpat in Expat before 2.2.7, XML input including XML names that contain a large number of colons could make the XML parser consume a high amount of RAM and CPU resources while processing (enough to be usable for denial-of-service attacks).
Remediation
Update to V3.1.5 or later version
CVE-2018-20843 · CSAF 2.0 · revision 3 · finalRed Hat Product Securityexpat: large number of colons in input makes parser consume high amount of resources, leading to DoSNo longer in the provider’s current catalogue
17 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • expat.src as a component of Red Hat Enterprise Linux 5
  • xmlrpc-c.src as a component of Red Hat Enterprise Linux 5
  • compat-expat1 as a component of Red Hat Enterprise Linux 6
  • compat-expat1.src as a component of Red Hat Enterprise Linux 6
  • expat as a component of Red Hat Enterprise Linux 6
  • expat-devel as a component of Red Hat Enterprise Linux 6
  • expat.src as a component of Red Hat Enterprise Linux 6
  • httpd as a component of Red Hat JBoss Enterprise Application Platform 6
  • httpd-devel as a component of Red Hat JBoss Enterprise Application Platform 6
  • httpd-manual as a component of Red Hat JBoss Enterprise Application Platform 6
  • httpd-tools as a component of Red Hat JBoss Enterprise Application Platform 6
  • httpd.src as a component of Red Hat JBoss Enterprise Application Platform 6
Summary
It was discovered that the "setElementTypePrefix()" function incorrectly extracted XML namespace prefixes. By tricking an application into processing a specially crafted XML file, an attacker could cause unusually high consumption of memory resources and possibly lead to a denial of service.
Remediation
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2018-13383

No EUVD known-exploited evidence

In libexpat in Expat before 2.2.7, XML input including XML names that contain a large number of colons could make the XML parser consume a high amount of RAM and CPU resources while processing (enough to be usable for denial-of-service attacks).

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
7.5 · CVSS 3.1
Advisory evidence
No linked advisory details stored yet
Recommended actionPatch only the product branches with a verified fix

High technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance. Verified remediation exists for at least one product or source, but 6 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Fix availability varies by product
01

What, why and how

In libexpat in Expat before 2.2.7, XML input including XML names that contain a large number of colons could make the XML parser consume a high amount of RAM and CPU resources while processing (enough to be usable for denial-of-service attacks).

What

In libexpat in Expat before 2.2.7, XML input including XML names that contain a large number of colons could make the XML parser consume a high amount of RAM and CPU resources while processing (enough to be usable for denial-of-service attacks).

Why

The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

In libexpat in Expat before 2.2.7, XML input including XML names that contain a large number of colons could make the XML parser consume a high amount of RAM and CPU resources while processing (enough to be usable for denial-of-service attacks).

Why

The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
Reference recorded

A structured CVE source labels at least one public reference as exploit material. BlackTree has not independently validated that it is safe, reliable or weaponised.

Likely attack path
a network path → Improper Restriction of XML External Entity Reference → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-611 ↗

CWE-611: Improper Restriction of XML External Entity Reference. The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CNoneConfidentiality impact: No direct loss is represented by this metric.INoneIntegrity impact: No direct loss is represented by this metric.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
NetworkUnauthenticatedCWE-611Public exploit reference
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2018-13383Official EUVD mapping

In libexpat in Expat before 2.2.7, XML input including XML names that contain a large number of colons could make the XML parser consume a high amount of RAM and CPU resources while processing (enough to be usable for denial-of-service attacks).

Official EUVD record ↗
BSI · German · WID-SEC-2025-0227IBM QRadar SIEM: Mehrere Schwachstellen

Ein entfernter, authentisierter Angreifer kann mehrere Schwachstellen in IBM QRadar SIEM ausnutzen, um seine Privilegien zu erweitern, Administratorrechte zu erlangen, beliebigen Programmcode auszuführen, Informationen offenzulegen, Dateien zu manipulieren oder Sicherheitsvorkehrungen zu umgehen.

Official advisory ↗
BSI · German · WID-SEC-2024-1735expat: Schwachstelle ermöglicht Denial of Service

Ein entfernter, anonymer Angreifer kann eine Schwachstelle in expat ausnutzen, um einen Denial of Service Angriff durchzuführen.

Official advisory ↗
CISA · English · ICSA-23-348-10Siemens SIMATIC S7-1500

In libexpat in Expat before 2.2.7, XML input including XML names that contain a large number of colons could make the XML parser consume a high amount of RAM and CPU resources while processing (enough to be usable for denial-of-service attacks).

Official advisory ↗
CERT-FR · French · CERTFR-2023-AVI-1015Multiples vulnérabilités dans les produits Siemens

Record?id=CVE-2017-9049 Référence CVE CVE-2017-9050 https://www.cve.org/CVERecord?id=CVE-2017-9050 Référence CVE CVE-2018-0495 https://www.cve.org/CVERecord?id=CVE-2018-0495 Référence CVE CVE-2018-12886 https://www.cve.org/CVERecord?id=CVE-2018-12886 Référence CVE CVE-2018-14404 https://www.cve.org/CVERecord?id=CVE-2018-14404 Référence CVE CVE-2018-14567 https://www.cve.org/CVERecord?id=CVE-2018-14567 Référence CVE CVE-2018-18928 https://www.cve.org/CVERecord?id=CVE-2018-18928 Référence CVE CVE-2018-19591 https://www.cve.org/CVERecord?id=CVE-2018-19591 Référence CVE CVE-2018-20482 https://www.cve.org/CVERecord?id=CVE-2018-20482 Référence CVE CVE-2018-20843 https://www.cve.org/CVERecord?id=CVE-2018-20843 Référence CVE CVE-2018-25032 https://www.cve.org/CVERecord?id=CVE-2018-25032 Référence CVE CVE-2019-1010022 https://www.cve.org/CVERecord?id=CVE-2019-1010022 Référence CVE CVE-2019-1010023 https://www.cve.org/CVERecord?id=CVE-2019-1010023 Référence CVE CVE-2019-1010024 https://www.cve.org/CVERecord?id=CVE-2019-1010024 Référence CVE CVE-2019-1010025 https://www.cve.org/CVERecord?id=CVE-2019-1010025 Référence CVE CVE-2019-1010180 https://www.cve.org/CVERecord?id=CVE-2019-1010180 Référence CVE CVE-2019-10160 https://www.cve.org/CVERecord?id=CVE-2019-10160 Référence CVE CVE-2019-11360 https://www.c

Official advisory ↗
CERT-FR · French · CERTFR-2022-AVI-267Multiples vulnérabilités dans Juniper Networks Junos Space

d?id=CVE-2018-18520 Référence CVE CVE-2018-18521 https://www.cve.org/CVERecord?id=CVE-2018-18521 Référence CVE CVE-2018-18751 https://www.cve.org/CVERecord?id=CVE-2018-18751 Référence CVE CVE-2018-19519 https://www.cve.org/CVERecord?id=CVE-2018-19519 Référence CVE CVE-2018-19788 https://www.cve.org/CVERecord?id=CVE-2018-19788 Référence CVE CVE-2018-19985 https://www.cve.org/CVERecord?id=CVE-2018-19985 Référence CVE CVE-2018-20060 https://www.cve.org/CVERecord?id=CVE-2018-20060 Référence CVE CVE-2018-20169 https://www.cve.org/CVERecord?id=CVE-2018-20169 Référence CVE CVE-2018-20836 https://www.cve.org/CVERecord?id=CVE-2018-20836 Référence CVE CVE-2018-20843 https://www.cve.org/CVERecord?id=CVE-2018-20843 Référence CVE CVE-2018-20852 https://www.cve.org/CVERecord?id=CVE-2018-20852 Référence CVE CVE-2018-3639 https://www.cve.org/CVERecord?id=CVE-2018-3639 Référence CVE CVE-2018-4180 https://www.cve.org/CVERecord?id=CVE-2018-4180 Référence CVE CVE-2018-4181 https://www.cve.org/CVERecord?id=CVE-2018-4181 Référence CVE CVE-2018-4700 https://www.cve.org/CVERecord?id=CVE-2018-4700 Référence CVE CVE-2018-5407 https://www.cve.org/CVERecord?id=CVE-2018-5407 Référence CVE CVE-2018-5683 https://www.cve.org/CVERecord?id=CVE-2018-5683 Référence CVE CVE-2018-5729 https://www.cve.org/CVERecord?id=CVE-2018-5729

Official advisory ↗
CERT-FR · French · CERTFR-2021-AVI-589Multiples vulnérabilités dans Juniper Junos Space Log Collector

couvertes dans Juniper Junos Space Log Collector. Certaines d'entre elles permettent à un attaquant de provoquer une exécution de code arbitraire à distance, un déni de service à distance et une atteinte à l'intégrité des données. Solution Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation). Documentation Bulletin de sécurité Juniper JSA11209 du 02 août 2021 https://kb.juniper.net/InfoCenter/index?page=content&id=JSA11209 Référence CVE CVE-2017-12652 https://www.cve.org/CVERecord?id=CVE-2017-12652 Référence CVE CVE-2018-20836 https://www.cve.org/CVERecord?id=CVE-2018-20836 Référence CVE CVE-2018-20843 https://www.cve.org/CVERecord?id=CVE-2018-20843 Référence CVE CVE-2019-11068 https://www.cve.org/CVERecord?id=CVE-2019-11068 Référence CVE CVE-2019-11756 https://www.cve.org/CVERecord?id=CVE-2019-11756 Référence CVE CVE-2019-12450 https://www.cve.org/CVERecord?id=CVE-2019-12450 Référence CVE CVE-2019-12614 https://www.cve.org/CVERecord?id=CVE-2019-12614 Référence CVE CVE-2019-14866 https://www.cve.org/CVERecord?id=CVE-2019-14866 Référence CVE CVE-2019-15807 https://www.cve.org/CVERecord?id=CVE-2019-15807 Référence CVE CVE-2019-15917 https://www.cve.org/CVERecord?id=CVE-2019-15917 Référence CVE CVE-2019-16231 https://www.cve.org/CVERecord?id=

Official advisory ↗
CERT-FR · French · CERTFR-2021-AVI-466Multiples vulnérabilités dans les produits Tenable

De multiples vulnérabilités ont été découvertes dans les produits Tenable. Elles permettent à un attaquant de provoquer une élévation de privilèges.

Official advisory ↗
CERT-FR · French · CERTFR-2020-AVI-691Multiples vulnérabilités dans les produits Juniper

x?page=content&id=JSA11073&cat=SIRT_1&actp=LIST Bulletin de sécurité Juniper JSA11074 du 28 octobre 2020 https://kb.juniper.net/InfoCenter/index?page=content&id=JSA11074&cat=SIRT_1&actp=LIST Bulletin de sécurité Juniper JSA11087 du 28 octobre 2020 https://kb.juniper.net/InfoCenter/index?page=content&id=JSA11087&cat=SIRT_1&actp=LIST Référence CVE CVE-2016-9841 https://www.cve.org/CVERecord?id=CVE-2016-9841 Référence CVE CVE-2016-9843 https://www.cve.org/CVERecord?id=CVE-2016-9843 Référence CVE CVE-2018-0732 https://www.cve.org/CVERecord?id=CVE-2018-0732 Référence CVE CVE-2018-20217 https://www.cve.org/CVERecord?id=CVE-2018-20217 Référence CVE CVE-2018-20843 https://www.cve.org/CVERecord?id=CVE-2018-20843 Référence CVE CVE-2018-5729 https://www.cve.org/CVERecord?id=CVE-2018-5729 Référence CVE CVE-2018-5730 https://www.cve.org/CVERecord?id=CVE-2018-5730 Référence CVE CVE-2019-13734 https://www.cve.org/CVERecord?id=CVE-2019-13734 Référence CVE CVE-2019-14846 https://www.cve.org/CVERecord?id=CVE-2019-14846 Référence CVE CVE-2019-1543 https://www.cve.org/CVERecord?id=CVE-2019-1543 Référence CVE CVE-2019-1547 https://www.cve.org/CVERecord?id=CVE-2019-1547 Référence CVE CVE-2019-1549 https://www.cve.org/CVERecord?id=CVE-2019-1549 Référence CVE CVE-2019-1551 https://www.cve.org/CVERecord?id=CVE-2019-15

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2018-015732Expat における XML 外部エンティティの脆弱性

Expat には、XML 外部エンティティの脆弱性が存在します。

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Fix availability varies by product
Affected
Fixed
Update to V3.1.5 or later version
Action
Use the product-specific evidence above. Patch only products with a verified fixed release, and keep every affected or under-investigation state without a matching fix in the remediation queue.
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04

Evidence and provenance

Published 24 Jun 2019 · Last source change 14 Oct 2026, 06:30 UTC · CWE-611 · Improper Restriction of XML External Entity Reference

CVE recordCVE.org · 5.2
CVSS sourceNIST NVD
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-09-01
European sourceENISA EUVD · EUVD-2018-13383
Product sourceVendor CSAF · SUSE Product Security Team
Remediation sourceVendor CSAF · SUSE Product Security Team
CWE sourceCISA ADP
NVD statusNVD modified after enrichment

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗
  1. Vendor guidanceAuthoritative vendor guidance changed: added remediation: oracle.com/cpuapr2020.html; removed patch: cert-portal.siemens.com/ssa-398330.html; removed remediation: cert-portal.siemens.com/ssa-398330.html.
    Before
    patch: cert-portal.siemens.com/ssa-398330.html · patch: github.com/11f8838bf99ea0a6f0b76f9760c43704d00c4ff6 · patch: github.com/186 · 6 more references
    After
    patch: github.com/11f8838bf99ea0a6f0b76f9760c43704d00c4ff6 · patch: github.com/186 · patch: github.com/262 · 5 more references
    oracle.com ↗
  2. Affected versionsThe structured affected or fixed version information changed.
    Before
    SIMATIC S7-1500 CPU 1518-4 PN/DP MFP: V3.1.0 < V3.1.5; SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP: V3.1.0 < V3.1.5; SIPLUS S7-1500 CPU 1518-4 PN/DP MFP: V3.1.0 < V3.1.5 · Fixed: Update to V3.1.5 or later version
    After
    SIMATIC S7-1500 CPU 1518-4 PN/DP MFP: V3.1.0 < V3.1.5; SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP: V3.1.0 < V3.1.5; SIPLUS S7-1500 CPU 1518-4 PN/DP MFP: V3.1.0 < V3.1.5 · Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
    Other authority ↗
  3. Vendor guidanceAuthoritative vendor guidance changed: added remediation: oracle.com/cpuapr2020.html; removed remediation: access.redhat.com/CVE-2018-20843.
    Before
    patch: github.com/11f8838bf99ea0a6f0b76f9760c43704d00c4ff6 · patch: github.com/186 · patch: github.com/262 · 5 more references
    After
    patch: github.com/11f8838bf99ea0a6f0b76f9760c43704d00c4ff6 · patch: github.com/186 · patch: github.com/262 · 5 more references
    oracle.com ↗
  4. Affected versionsThe structured affected or fixed version information changed.
    Before
    n/a · Fixed: Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
    After
    SIMATIC S7-1500 CPU 1518-4 PN/DP MFP: V3.1.0 < V3.1.5; SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP: V3.1.0 < V3.1.5; SIPLUS S7-1500 CPU 1518-4 PN/DP MFP: V3.1.0 < V3.1.5 · Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
    Other authority ↗
  5. Affected versionsThe structured affected or fixed version information changed.
    Before
    SIMATIC S7-1500 CPU 1518-4 PN/DP MFP: V3.1.0 < V3.1.5; SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP: V3.1.0 < V3.1.5; SIPLUS S7-1500 CPU 1518-4 PN/DP MFP: V3.1.0 < V3.1.5 · Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
    After
    SIMATIC S7-1500 CPU 1518-4 PN/DP MFP: V3.1.0 < V3.1.5; SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP: V3.1.0 < V3.1.5; SIPLUS S7-1500 CPU 1518-4 PN/DP MFP: V3.1.0 < V3.1.5 · Fixed: Update to V3.1.5 or later version
    Siemens ProductCERT ↗
  6. Vendor guidanceAuthoritative vendor guidance changed from remediation: access.redhat.com/CVE-2018-20843 to advisory no longer present in the provider's current catalogue.
    Before
    remediation: access.redhat.com/CVE-2018-20843
    After
    advisory no longer present in the provider's current catalogue
    Red Hat Product Security ↗
  7. Affected versionsThe structured affected or fixed version information changed.
    Before
    n/a · Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
    After
    n/a · Fixed: Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
    Red Hat Product Security ↗
  8. ENISA EUVD mappingEUVD-2018-13383 was added to the official ENISA EUVD mapping for this CVE.
    Before
    not recorded
    After
    {"euvdId":"EUVD-2018-13383"}
    ENISA EUVD ↗
  9. Vendor guidanceAuthoritative vendor guidance changed: added patch: github.com/11f8838bf99ea0a6f0b76f9760c43704d00c4ff6; added patch: github.com/186; removed vendor advisory: debian.org/dsa-4472; removed vendor advisory: lists.fedoraproject.org/CEJJSQSG3KSUQY4FPVHZ7ZTT7FORMFVD; 6 further additions; 5 further removals.
    Before
    vendor advisory: debian.org/dsa-4472 · vendor advisory: lists.fedoraproject.org/CEJJSQSG3KSUQY4FPVHZ7ZTT7FORMFVD · vendor advisory: lists.fedoraproject.org/IDAUGEB3TUP6NEKJDBUBZX7N5OAUOOOK · 4 more references
    After
    patch: github.com/11f8838bf99ea0a6f0b76f9760c43704d00c4ff6 · patch: github.com/186 · patch: github.com/262 · 5 more references
    oracle.com ↗
  10. Affected versionsThe structured affected or fixed version information changed.
    Before
    n/a · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    After
    n/a · Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
    CNA ↗
  11. Remediation statusRemediation status changed from Awaiting fix to Patch available.
    Before
    Awaiting fix
    After
    Patch available
    oracle.com ↗
  12. Public exploit evidencePublic exploit evidence changed from No public exploit to Public exploit reference.
    Before
    No public exploit
    After
    Public exploit reference
    github.com ↗
  13. CVSS scoreCVSS scoring authority changed from CISA ADP to NIST NVD; the displayed base score remained 7.5.
    Before
    7.5 (CVSS 3.1 · CISA ADP · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
    After
    7.5 (CVSS 3.1 · NIST NVD · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
    NIST NVD ↗
  14. Catalogue recordCVE added to the BlackTree catalogue.
    CNA ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2018-20843 · cve.blacktree.nl