BlackTreeIndependent security intelligence
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Full vulnerability report · 2020
CVE-2020-7595High confidence

xmlStringLenDecodeEntities in parser.c in libxml2 2.9.10 has an infinite loop in a certain end-of-file situation

n/a · n/a

7.5HighCVSS 3.1
Recommended action
Within 7 days

High technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance.

Patch available
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
SSA-398330 · CSAF 2.0 · revision 18 · interimSiemens ProductCERTSSA-398330: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP >= V3.1.0 and < V3.1.5
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)
  • SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0)
  • SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0)
  • SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0)
  • SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0)
Summary
xmlStringLenDecodeEntities in parser.c in libxml2 2.9.10 has an infinite loop in a certain end-of-file situation.
Remediation
Update to V3.1.5 or later version
SSA-292794 · CSAF 2.0 · revision 1 · finalSiemens ProductCERTSSA-292794: Multiple Denial-of-Service Vulnerabilities in SINEMA Remote Connect Server
1 known affected

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

  • SINEMA Remote Connect Server
Summary
xmlStringLenDecodeEntities in parser.c in libxml2 2.9.10 has an infinite loop in a certain end-of-file situation.
Remediation
Update to V3.0
Optional official sources

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

Select the national-authority views to include. The exact source language is shown on each matched advisory. Your choice is remembered on this device and encoded in the shareable URL.

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-2020-0292

No EUVD known-exploited evidence

ENISA has published the identifier mapping but no EUVD description has been stored yet.

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
Not supplied in the stored EUVD record
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 7 days

High technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance.

Patch available
01

What, why and how

xmlStringLenDecodeEntities in parser.c in libxml2 2.9.10 has an infinite loop in a certain end-of-file situation.

What

xmlStringLenDecodeEntities in parser.c in libxml2 2.9.10 has an infinite loop in a certain end-of-file situation.

Why

A malformed condition prevents a loop from making progress or terminating, allowing resource exhaustion.

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

xmlStringLenDecodeEntities in parser.c in libxml2 2.9.10 has an infinite loop in a certain end-of-file situation.

Why

A malformed condition prevents a loop from making progress or terminating, allowing resource exhaustion.

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

CISA Vulnrichment records proof-of-concept exploitation in its SSVC data. BlackTree has not independently executed or validated exploit material.

Likely attack path
a network path → Loop with Unreachable Exit Condition ('Infinite Loop') → 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-835 ↗

CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop'). The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop.

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-835Public exploit reference
A

Official authority intelligence

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

BSI · German · WID-SEC-W-2023-1614Tenable Security Nessus Network Monitor: Mehrere Schwachstellen

Ein entfernter, anonymer, authentisierter oder lokaler Angreifer kann mehrere Schwachstellen in Tenable Security Nessus Network Monitor ausnutzen, um beliebigen Code auszuführen, vertrauliche Informationen offenzulegen, einen Denial-of-Service-Zustand auszulösen und Daten zu manipulieren.

Official advisory
BSI · German · WID-SEC-W-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-W-2025-0616libxml2: Schwachstelle ermöglicht Denial of Service

Ein entfernter, anonymer Angreifer kann eine Schwachstelle in libxml2 ausnutzen, um einen Denial of Service Angriff durchzuführen.

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

ord?id=CVE-2020-36223 Référence CVE CVE-2020-36224 https://www.cve.org/CVERecord?id=CVE-2020-36224 Référence CVE CVE-2020-36225 https://www.cve.org/CVERecord?id=CVE-2020-36225 Référence CVE CVE-2020-36226 https://www.cve.org/CVERecord?id=CVE-2020-36226 Référence CVE CVE-2020-36227 https://www.cve.org/CVERecord?id=CVE-2020-36227 Référence CVE CVE-2020-36228 https://www.cve.org/CVERecord?id=CVE-2020-36228 Référence CVE CVE-2020-36229 https://www.cve.org/CVERecord?id=CVE-2020-36229 Référence CVE CVE-2020-36230 https://www.cve.org/CVERecord?id=CVE-2020-36230 Référence CVE CVE-2020-6096 https://www.cve.org/CVERecord?id=CVE-2020-6096 Référence CVE CVE-2020-7595 https://www.cve.org/CVERecord?id=CVE-2020-7595 Référence CVE CVE-2020-8169 https://www.cve.org/CVERecord?id=CVE-2020-8169 Référence CVE CVE-2020-8177 https://www.cve.org/CVERecord?id=CVE-2020-8177 Référence CVE CVE-2020-8231 https://www.cve.org/CVERecord?id=CVE-2020-8231 Référence CVE CVE-2020-8284 https://www.cve.org/CVERecord?id=CVE-2020-8284 Référence CVE CVE-2020-8285 https://www.cve.org/CVERecord?id=CVE-2020-8285 Référence CVE CVE-2020-8286 https://www.cve.org/CVERecord?id=CVE-2020-8286 Référence CVE CVE-2020-8315 https://www.cve.org/CVERecord?id=CVE-2020-8315 Référence CVE CVE-2020-8492 https://www.cve.org/CVERecord?id=CVE-2020-8492 Ré

Official advisory
CERT-FR · French · CERTFR-2023-AVI-0499Multiples vulnérabilités dans Tenable Nessus Network Monitor

d?id=CVE-2020-13630 Référence CVE CVE-2020-13631 https://www.cve.org/CVERecord?id=CVE-2020-13631 Référence CVE CVE-2020-13632 https://www.cve.org/CVERecord?id=CVE-2020-13632 Référence CVE CVE-2020-13871 https://www.cve.org/CVERecord?id=CVE-2020-13871 Référence CVE CVE-2020-14155 https://www.cve.org/CVERecord?id=CVE-2020-14155 Référence CVE CVE-2020-15358 https://www.cve.org/CVERecord?id=CVE-2020-15358 Référence CVE CVE-2020-24977 https://www.cve.org/CVERecord?id=CVE-2020-24977 Référence CVE CVE-2020-35525 https://www.cve.org/CVERecord?id=CVE-2020-35525 Référence CVE CVE-2020-35527 https://www.cve.org/CVERecord?id=CVE-2020-35527 Référence CVE CVE-2020-7595 https://www.cve.org/CVERecord?id=CVE-2020-7595 Référence CVE CVE-2020-9327 https://www.cve.org/CVERecord?id=CVE-2020-9327 Référence CVE CVE-2021-20227 https://www.cve.org/CVERecord?id=CVE-2021-20227 Référence CVE CVE-2021-30560 https://www.cve.org/CVERecord?id=CVE-2021-30560 Référence CVE CVE-2021-31239 https://www.cve.org/CVERecord?id=CVE-2021-31239 Référence CVE CVE-2021-3517 https://www.cve.org/CVERecord?id=CVE-2021-3517 Référence CVE CVE-2021-3518 https://www.cve.org/CVERecord?id=CVE-2021-3518 Référence CVE CVE-2021-3537 https://www.cve.org/CVERecord?id=CVE-2021-3537 Référence CVE CVE-2021-3541 https://www.cve.org/CVERecord?id=CVE-2021-3

Official advisory
CERT-FR · French · CERTFR-2022-AVI-663Multiples vulnérabilités dans IBM QRadar

port/pages/node/6605299 Référence CVE CVE-2017-12652 https://www.cve.org/CVERecord?id=CVE-2017-12652 Référence CVE CVE-2018-11782 https://www.cve.org/CVERecord?id=CVE-2018-11782 Référence CVE CVE-2019-11068 https://www.cve.org/CVERecord?id=CVE-2019-11068 Référence CVE CVE-2019-18197 https://www.cve.org/CVERecord?id=CVE-2019-18197 Référence CVE CVE-2019-19956 https://www.cve.org/CVERecord?id=CVE-2019-19956 Référence CVE CVE-2019-20388 https://www.cve.org/CVERecord?id=CVE-2019-20388 Référence CVE CVE-2019-5094 https://www.cve.org/CVERecord?id=CVE-2019-5094 Référence CVE CVE-2019-5188 https://www.cve.org/CVERecord?id=CVE-2019-5188 Référence CVE CVE-2020-7595 https://www.cve.org/CVERecord?id=CVE-2020-7595 Référence CVE CVE-2021-45960 https://www.cve.org/CVERecord?id=CVE-2021-45960 Référence CVE CVE-2021-46143 https://www.cve.org/CVERecord?id=CVE-2021-46143 Référence CVE CVE-2022-22822 https://www.cve.org/CVERecord?id=CVE-2022-22822 Référence CVE CVE-2022-22823 https://www.cve.org/CVERecord?id=CVE-2022-22823 Référence CVE CVE-2022-22824 https://www.cve.org/CVERecord?id=CVE-2022-22824 Référence CVE CVE-2022-22825 https://www.cve.org/CVERecord?id=CVE-2022-22825 Référence CVE CVE-2022-22826 https://www.cve.org/CVERecord?id=CVE-2022-22826 Référence CVE CVE-2022-22827 https://www.cve.org/CVERecord?id=C

Official advisory
CERT-FR · French · CERTFR-2021-AVI-700Multiples vulnérabilités dans les produits IBM

ecord?id=CVE-2020-12049 Référence CVE CVE-2020-12825 https://www.cve.org/CVERecord?id=CVE-2020-12825 Référence CVE CVE-2020-13401 https://www.cve.org/CVERecord?id=CVE-2020-13401 Référence CVE CVE-2020-15049 https://www.cve.org/CVERecord?id=CVE-2020-15049 Référence CVE CVE-2020-15810 https://www.cve.org/CVERecord?id=CVE-2020-15810 Référence CVE CVE-2020-15811 https://www.cve.org/CVERecord?id=CVE-2020-15811 Référence CVE CVE-2020-24606 https://www.cve.org/CVERecord?id=CVE-2020-24606 Référence CVE CVE-2020-5258 https://www.cve.org/CVERecord?id=CVE-2020-5258 Référence CVE CVE-2020-5259 https://www.cve.org/CVERecord?id=CVE-2020-5259 Référence CVE CVE-2020-7595 https://www.cve.org/CVERecord?id=CVE-2020-7595 Référence CVE CVE-2020-8177 https://www.cve.org/CVERecord?id=CVE-2020-8177 Référence CVE CVE-2020-8449 https://www.cve.org/CVERecord?id=CVE-2020-8449 Référence CVE CVE-2020-8450 https://www.cve.org/CVERecord?id=CVE-2020-8450 Référence CVE CVE-2021-20385 https://www.cve.org/CVERecord?id=CVE-2021-20385 Référence CVE CVE-2021-20386 https://www.cve.org/CVERecord?id=CVE-2021-20386 Référence CVE CVE-2021-20389 https://www.cve.org/CVERecord?id=CVE-2021-20389 Référence CVE CVE-2021-20419 https://www.cve.org/CVERecord?id=CVE-2021-20419 Référence CVE CVE-2021-20426 https://www.cve.org/CVERecord?id=CVE-202

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

d?id=CVE-2020-25632 Référence CVE CVE-2020-25643 https://www.cve.org/CVERecord?id=CVE-2020-25643 Référence CVE CVE-2020-25647 https://www.cve.org/CVERecord?id=CVE-2020-25647 Référence CVE CVE-2020-25705 https://www.cve.org/CVERecord?id=CVE-2020-25705 Référence CVE CVE-2020-27749 https://www.cve.org/CVERecord?id=CVE-2020-27749 Référence CVE CVE-2020-27779 https://www.cve.org/CVERecord?id=CVE-2020-27779 Référence CVE CVE-2020-28374 https://www.cve.org/CVERecord?id=CVE-2020-28374 Référence CVE CVE-2020-29573 https://www.cve.org/CVERecord?id=CVE-2020-29573 Référence CVE CVE-2020-29661 https://www.cve.org/CVERecord?id=CVE-2020-29661 Référence CVE CVE-2020-7595 https://www.cve.org/CVERecord?id=CVE-2020-7595 Référence CVE CVE-2020-8625 https://www.cve.org/CVERecord?id=CVE-2020-8625 Référence CVE CVE-2021-20225 https://www.cve.org/CVERecord?id=CVE-2021-20225 Référence CVE CVE-2021-20233 https://www.cve.org/CVERecord?id=CVE-2021-20233 Référence CVE CVE-2021-20265 https://www.cve.org/CVERecord?id=CVE-2021-20265 Référence CVE CVE-2021-20305 https://www.cve.org/CVERecord?id=CVE-2021-20305 Référence CVE CVE-2021-3156 https://www.cve.org/CVERecord?id=CVE-2021-3156 Gestion détaillée du document le 03 août 2021 Version initiale Alertes Avis Bulletins d’actualités Mentions légales Conditions générales À propo

Official advisory
CERT-FR · French · CERTFR-2021-AVI-255Multiples vulnérabilités dans les produits Siemens

d?id=CVE-2020-15795 Référence CVE CVE-2020-25243 https://www.cve.org/CVERecord?id=CVE-2020-25243 Référence CVE CVE-2020-25244 https://www.cve.org/CVERecord?id=CVE-2020-25244 Référence CVE CVE-2020-26997 https://www.cve.org/CVERecord?id=CVE-2020-26997 Référence CVE CVE-2020-27009 https://www.cve.org/CVERecord?id=CVE-2020-27009 Référence CVE CVE-2020-27736 https://www.cve.org/CVERecord?id=CVE-2020-27736 Référence CVE CVE-2020-27737 https://www.cve.org/CVERecord?id=CVE-2020-27737 Référence CVE CVE-2020-27738 https://www.cve.org/CVERecord?id=CVE-2020-27738 Référence CVE CVE-2020-28385 https://www.cve.org/CVERecord?id=CVE-2020-28385 Référence CVE CVE-2020-7595 https://www.cve.org/CVERecord?id=CVE-2020-7595 Référence CVE CVE-2021-25663 https://www.cve.org/CVERecord?id=CVE-2021-25663 Référence CVE CVE-2021-25664 https://www.cve.org/CVERecord?id=CVE-2021-25664 Référence CVE CVE-2021-25670 https://www.cve.org/CVERecord?id=CVE-2021-25670 Référence CVE CVE-2021-25677 https://www.cve.org/CVERecord?id=CVE-2021-25677 Référence CVE CVE-2021-25678 https://www.cve.org/CVERecord?id=CVE-2021-25678 Référence CVE CVE-2021-27380 https://www.cve.org/CVERecord?id=CVE-2021-27380 Référence CVE CVE-2021-27382 https://www.cve.org/CVERecord?id=CVE-2021-27382 Référence CVE CVE-2021-27389 https://www.cve.org/CVERecord?id=C

Official advisory
CERT-FR · French · CERTFR-2020-AVI-257Multiples vulnérabilités dans GitLab

De multiples vulnérabilités ont été découvertes dans GitLab. Elles permettent à un attaquant de provoquer un déni de service, un contournement de la politique de sécurité et une atteinte à la confidentialité des données. Note : toutes les vulnérabilités ne disposent pas encore d'un identifiant CVE.

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.
Patch available
Affected
SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0); SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0); SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0); SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0); SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0)
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.
Action
Update to V3.1.5 or later version
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 21 Jan 2020 · Last source change 3 Dec 2025, 15:50 UTC · CWE-835 · Loop with Unreachable Exit Condition ('Infinite Loop')

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 2026-08-14
European sourceENISA EUVD · EUVD-2020-0292
Product sourceVendor CSAF · Siemens ProductCERT
Remediation sourceVendor CSAF · Siemens ProductCERT
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 →

No material field changes have been recorded since change tracking began. Routine source refreshes and cosmetic edits are intentionally excluded.

Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2020-0292↗Vendor CSAF · Siemens ProductCERT↗CISA Vulnrichment SSVC evidence↗Patch or update reference↗Patch or update reference↗Patch or update reference↗CVE authority or vendor reference↗Official CVE record (CNA and ADP data)↗NVD record↗
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-2020-7595 · cve.blacktree.nl