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Full vulnerability report · 2020
CVE-2019-20388High confidence

xmlSchemaPreRun in xmlschemas.c in libxml2 2.9.10 allows an xmlSchemaValidateStream memory leak

n/a · n/a

7.5HighCVSS 3.1
Recommended action
Within 7 days

High technical severity; 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.

1 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
xmlSchemaPreRun in xmlschemas.c in libxml2 2.9.10 allows an xmlSchemaValidateStream memory leak.
Remediation
Update to V3.1.5 or later version
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-2019-10940

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; prioritise exposed affected systems while verifying vendor guidance.

Patch available
01

What, why and how

xmlSchemaPreRun in xmlschemas.c in libxml2 2.9.10 allows an xmlSchemaValidateStream memory leak.

What

xmlSchemaPreRun in xmlschemas.c in libxml2 2.9.10 allows an xmlSchemaValidateStream memory leak.

Why

The product does not sufficiently track and release allocated memory after it has been used, making the memory unavailable for reallocation and reuse.

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

xmlSchemaPreRun in xmlschemas.c in libxml2 2.9.10 allows an xmlSchemaValidateStream memory leak.

Why

The product does not sufficiently track and release allocated memory after it has been used, making the memory unavailable for reallocation and reuse.

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.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
a network path → Missing Release of Memory after Effective Lifetime → 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-401 ↗

CWE-401: Missing Release of Memory after Effective Lifetime. The product does not sufficiently track and release allocated memory after it has been used, making the memory unavailable for reallocation and reuse.

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-401
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
CERT-FR · French · CERTFR-2023-AVI-1015Multiples vulnérabilités dans les produits Siemens

d?id=CVE-2019-19906 Référence CVE CVE-2019-19923 https://www.cve.org/CVERecord?id=CVE-2019-19923 Référence CVE CVE-2019-19924 https://www.cve.org/CVERecord?id=CVE-2019-19924 Référence CVE CVE-2019-19925 https://www.cve.org/CVERecord?id=CVE-2019-19925 Référence CVE CVE-2019-19926 https://www.cve.org/CVERecord?id=CVE-2019-19926 Référence CVE CVE-2019-19956 https://www.cve.org/CVERecord?id=CVE-2019-19956 Référence CVE CVE-2019-19959 https://www.cve.org/CVERecord?id=CVE-2019-19959 Référence CVE CVE-2019-20218 https://www.cve.org/CVERecord?id=CVE-2019-20218 Référence CVE CVE-2019-20367 https://www.cve.org/CVERecord?id=CVE-2019-20367 Référence CVE CVE-2019-20388 https://www.cve.org/CVERecord?id=CVE-2019-20388 Référence CVE CVE-2019-20795 https://www.cve.org/CVERecord?id=CVE-2019-20795 Référence CVE CVE-2019-20907 https://www.cve.org/CVERecord?id=CVE-2019-20907 Référence CVE CVE-2019-25013 https://www.cve.org/CVERecord?id=CVE-2019-25013 Référence CVE CVE-2019-3855 https://www.cve.org/CVERecord?id=CVE-2019-3855 Référence CVE CVE-2019-3856 https://www.cve.org/CVERecord?id=CVE-2019-3856 Référence CVE CVE-2019-3857 https://www.cve.org/CVERecord?id=CVE-2019-3857 Référence CVE CVE-2019-3858 https://www.cve.org/CVERecord?id=CVE-2019-3858 Référence CVE CVE-2019-3859 https://www.cve.org/CVERecord?id=CVE-2019-

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

d?id=CVE-2019-19646 Référence CVE CVE-2019-19880 https://www.cve.org/CVERecord?id=CVE-2019-19880 Référence CVE CVE-2019-19923 https://www.cve.org/CVERecord?id=CVE-2019-19923 Référence CVE CVE-2019-19924 https://www.cve.org/CVERecord?id=CVE-2019-19924 Référence CVE CVE-2019-19925 https://www.cve.org/CVERecord?id=CVE-2019-19925 Référence CVE CVE-2019-19926 https://www.cve.org/CVERecord?id=CVE-2019-19926 Référence CVE CVE-2019-19956 https://www.cve.org/CVERecord?id=CVE-2019-19956 Référence CVE CVE-2019-19959 https://www.cve.org/CVERecord?id=CVE-2019-19959 Référence CVE CVE-2019-20218 https://www.cve.org/CVERecord?id=CVE-2019-20218 Référence CVE CVE-2019-20388 https://www.cve.org/CVERecord?id=CVE-2019-20388 Référence CVE CVE-2019-20838 https://www.cve.org/CVERecord?id=CVE-2019-20838 Référence CVE CVE-2019-5815 https://www.cve.org/CVERecord?id=CVE-2019-5815 Référence CVE CVE-2019-8457 https://www.cve.org/CVERecord?id=CVE-2019-8457 Référence CVE CVE-2019-9936 https://www.cve.org/CVERecord?id=CVE-2019-9936 Référence CVE CVE-2019-9937 https://www.cve.org/CVERecord?id=CVE-2019-9937 Référence CVE CVE-2020-11655 https://www.cve.org/CVERecord?id=CVE-2020-11655 Référence CVE CVE-2020-11656 https://www.cve.org/CVERecord?id=CVE-2020-11656 Référence CVE CVE-2020-13434 https://www.cve.org/CVERecord?id=CVE-2020

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

orrectifs (cf. section Documentation). Documentation Bulletin de sécurité IBM 6441625 du 19 juillet 2022 https://www.ibm.com/support/pages/node/6441625 Bulletin de sécurité IBM 6605299 du 19 juillet 2022 https://www.ibm.com/support/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-20

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

/pages/node/6455281 Référence CVE CVE-2019-10785 https://www.cve.org/CVERecord?id=CVE-2019-10785 Référence CVE CVE-2019-11719 https://www.cve.org/CVERecord?id=CVE-2019-11719 Référence CVE CVE-2019-12450 https://www.cve.org/CVERecord?id=CVE-2019-12450 Référence CVE CVE-2019-12528 https://www.cve.org/CVERecord?id=CVE-2019-12528 Référence CVE CVE-2019-12749 https://www.cve.org/CVERecord?id=CVE-2019-12749 Référence CVE CVE-2019-14822 https://www.cve.org/CVERecord?id=CVE-2019-14822 Référence CVE CVE-2019-14866 https://www.cve.org/CVERecord?id=CVE-2019-14866 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-2019-5482 https://www.cve.org/CVERecord?id=CVE-2019-5482 Référence CVE CVE-2020-10754 https://www.cve.org/CVERecord?id=CVE-2020-10754 Référence CVE CVE-2020-12049 https://www.cve.org/CVERecord?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-20

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

d?id=CVE-2019-19447 Référence CVE CVE-2019-19523 https://www.cve.org/CVERecord?id=CVE-2019-19523 Référence CVE CVE-2019-19524 https://www.cve.org/CVERecord?id=CVE-2019-19524 Référence CVE CVE-2019-19530 https://www.cve.org/CVERecord?id=CVE-2019-19530 Référence CVE CVE-2019-19537 https://www.cve.org/CVERecord?id=CVE-2019-19537 Référence CVE CVE-2019-19807 https://www.cve.org/CVERecord?id=CVE-2019-19807 Référence CVE CVE-2019-19956 https://www.cve.org/CVERecord?id=CVE-2019-19956 Référence CVE CVE-2019-20054 https://www.cve.org/CVERecord?id=CVE-2019-20054 Référence CVE CVE-2019-20095 https://www.cve.org/CVERecord?id=CVE-2019-20095 Référence CVE CVE-2019-20388 https://www.cve.org/CVERecord?id=CVE-2019-20388 Référence CVE CVE-2019-20636 https://www.cve.org/CVERecord?id=CVE-2019-20636 Référence CVE CVE-2019-20907 https://www.cve.org/CVERecord?id=CVE-2019-20907 Référence CVE CVE-2019-25013 https://www.cve.org/CVERecord?id=CVE-2019-25013 Référence CVE CVE-2019-5482 https://www.cve.org/CVERecord?id=CVE-2019-5482 Référence CVE CVE-2019-8675 https://www.cve.org/CVERecord?id=CVE-2019-8675 Référence CVE CVE-2019-8696 https://www.cve.org/CVERecord?id=CVE-2019-8696 Référence CVE CVE-2020-10543 https://www.cve.org/CVERecord?id=CVE-2020-10543 Référence CVE CVE-2020-10878 https://www.cve.org/CVERecord?id=CVE-20

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 17 Dec 2025, 21:50 UTC · CWE-401 · Missing Release of Memory after Effective Lifetime

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-2019-10940
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-2019-10940↗Vendor CSAF · Siemens ProductCERT↗Patch or update reference↗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-2019-20388 · cve.blacktree.nl