BlackTreeIndependent security intelligence

Full vulnerability report · 2024

CVE-2023-6780High confidence

Glibc: integer overflow in __vsyslog_internal()

n/a · glibc

5.3MediumCVSS 3.1

Recommended action

Within 7 days

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

Patch available

Distribution package intelligence

Ubuntu vendor package status

Canonical’s release and source-package findings are shown separately from local repository availability.

1 package state

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.

Ubuntu release	Source package	Vendor state	Fixed version	Evidence
Ubuntu 24.04 LTSnoble · standard archive	`glibc`	Vendor fix publishedCanonical reports that a fixed source package version has been published. Repository candidate availability is not checked by BlackTree.	`2.39-0ubuntu1`	Canonical record ↗Source updated 8 Sept 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.

1 current

SSA-082556 · CSAF 2.0 · revision 7 · interimSiemens ProductCERTSSA-082556: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP 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) >= V3.1.5
SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= V3.1.5
SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) >= V3.1.5
SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) >= V3.1.5
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) >= V3.1.5

Summary: An integer overflow was found in the __vsyslog_internal function of the glibc library. This function is called by the syslog and vsyslog functions. This issue occurs when these functions are called with a very long message, leading to an incorrect calculation of the buffer size to store the message, resulting in undefined behavior. This issue affects glibc 2.37 and newer.
Remediation: Limit access to the interactive shell of the additional GNU/Linux subssytem to trusted personnel only.

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-2023-58992

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

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

Patch available

What, why and how

An integer overflow was found in the __vsyslog_internal function of the glibc library. This function is called by the syslog and vsyslog functions. This issue occurs when these functions are called with a very long message, leading to an incorrect calculation of the buffer size to store the message, resulting in undefined behavior. This issue affects glibc 2.37 and newer.

What

Why

The product does not correctly calculate the size to be used when allocating a buffer, which could lead to a buffer overflow.

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

Why

The product does not correctly calculate the size to be used when allocating a buffer, which could lead to a buffer overflow.

How

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 → Incorrect Calculation of Buffer Size → 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-131 ↗
CWE-131: Incorrect Calculation of Buffer Size. The product does not correctly calculate the size to be used when allocating a buffer, which could lead to a buffer overflow.
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:L
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.ALowAvailability impact: A successful attack can cause a limited 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-131Public exploit reference

Official authority intelligence

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

ENISA EUVD · EUVD-2023-58992Official EUVD mapping

0 linked advisory records.

Official EUVD record

BSI · German · WID-SEC-W-2024-0246GNU libc: Mehrere Schwachstellen

Ein lokaler Angreifer kann mehrere Schwachstellen in GNU libc ausnutzen, um seine Privilegien zu erhöhen oder einen Denial of Service Zustand herbeizuführen.

Official advisory

CERT-FR · French · CERTFR-2026-AVI-0218Multiples vulnérabilités dans les produits VMware

g/CVERecord?id=CVE-2023-52426 Référence CVE CVE-2023-53107 https://www.cve.org/CVERecord?id=CVE-2023-53107 Référence CVE CVE-2023-53164 https://www.cve.org/CVERecord?id=CVE-2023-53164 Référence CVE CVE-2023-53182 https://www.cve.org/CVERecord?id=CVE-2023-53182 Référence CVE CVE-2023-5388 https://www.cve.org/CVERecord?id=CVE-2023-5388 Référence CVE CVE-2023-5752 https://www.cve.org/CVERecord?id=CVE-2023-5752 Référence CVE CVE-2023-6228 https://www.cve.org/CVERecord?id=CVE-2023-6228 Référence CVE CVE-2023-6277 https://www.cve.org/CVERecord?id=CVE-2023-6277 Référence CVE CVE-2023-6779 https://www.cve.org/CVERecord?id=CVE-2023-6779 Référence CVE CVE-2023-6780 https://www.cve.org/CVERecord?id=CVE-2023-6780 Référence CVE CVE-2024-0743 https://www.cve.org/CVERecord?id=CVE-2024-0743 Référence CVE CVE-2024-10041 https://www.cve.org/CVERecord?id=CVE-2024-10041 Référence CVE CVE-2024-1013 https://www.cve.org/CVERecord?id=CVE-2024-1013 Référence CVE CVE-2024-11053 https://www.cve.org/CVERecord?id=CVE-2024-11053 Référence CVE CVE-2024-11168 https://www.cve.org/CVERecord?id=CVE-2024-11168 Référence CVE CVE-2024-12133 https://www.cve.org/CVERecord?id=CVE-2024-12133 Référence CVE CVE-2024-12243 https://www.cve.org/CVERecord?id=CVE-2024-12243 Référence CVE CVE-2024-12718 https://www.cve.org/CVERecord?id=CVE-2

Official advisory

CERT-FR · French · CERTFR-2025-AVI-0969Multiples vulnérabilités dans les produits VMware

.cve.org/CVERecord?id=CVE-2023-6228 Référence CVE CVE-2023-6237 https://www.cve.org/CVERecord?id=CVE-2023-6237 Référence CVE CVE-2023-6246 https://www.cve.org/CVERecord?id=CVE-2023-6246 Référence CVE CVE-2023-6277 https://www.cve.org/CVERecord?id=CVE-2023-6277 Référence CVE CVE-2023-6349 https://www.cve.org/CVERecord?id=CVE-2023-6349 Référence CVE CVE-2023-6378 https://www.cve.org/CVERecord?id=CVE-2023-6378 Référence CVE CVE-2023-6481 https://www.cve.org/CVERecord?id=CVE-2023-6481 Référence CVE CVE-2023-6597 https://www.cve.org/CVERecord?id=CVE-2023-6597 Référence CVE CVE-2023-6779 https://www.cve.org/CVERecord?id=CVE-2023-6779 Référence CVE CVE-2023-6780 https://www.cve.org/CVERecord?id=CVE-2023-6780 Référence CVE CVE-2023-6918 https://www.cve.org/CVERecord?id=CVE-2023-6918 Référence CVE CVE-2023-7008 https://www.cve.org/CVERecord?id=CVE-2023-7008 Référence CVE CVE-2023-7104 https://www.cve.org/CVERecord?id=CVE-2023-7104 Référence CVE CVE-2024-0397 https://www.cve.org/CVERecord?id=CVE-2024-0397 Référence CVE CVE-2024-0450 https://www.cve.org/CVERecord?id=CVE-2024-0450 Référence CVE CVE-2024-0553 https://www.cve.org/CVERecord?id=CVE-2024-0553 Référence CVE CVE-2024-0567 https://www.cve.org/CVERecord?id=CVE-2024-0567 Référence CVE CVE-2024-0727 https://www.cve.org/CVERecord?id=CVE-2024-0727 Ré

Official advisory

CERT-FR · French · CERTFR-2025-AVI-0756Multiples vulnérabilités dans les produits VMware

.cve.org/CVERecord?id=CVE-2023-5841 Référence CVE CVE-2023-5981 https://www.cve.org/CVERecord?id=CVE-2023-5981 Référence CVE CVE-2023-6129 https://www.cve.org/CVERecord?id=CVE-2023-6129 Référence CVE CVE-2023-6237 https://www.cve.org/CVERecord?id=CVE-2023-6237 Référence CVE CVE-2023-6246 https://www.cve.org/CVERecord?id=CVE-2023-6246 Référence CVE CVE-2023-6378 https://www.cve.org/CVERecord?id=CVE-2023-6378 Référence CVE CVE-2023-6481 https://www.cve.org/CVERecord?id=CVE-2023-6481 Référence CVE CVE-2023-6597 https://www.cve.org/CVERecord?id=CVE-2023-6597 Référence CVE CVE-2023-6779 https://www.cve.org/CVERecord?id=CVE-2023-6779 Référence CVE CVE-2023-6780 https://www.cve.org/CVERecord?id=CVE-2023-6780 Référence CVE CVE-2023-7104 https://www.cve.org/CVERecord?id=CVE-2023-7104 Référence CVE CVE-2024-0397 https://www.cve.org/CVERecord?id=CVE-2024-0397 Référence CVE CVE-2024-0450 https://www.cve.org/CVERecord?id=CVE-2024-0450 Référence CVE CVE-2024-0553 https://www.cve.org/CVERecord?id=CVE-2024-0553 Référence CVE CVE-2024-0567 https://www.cve.org/CVERecord?id=CVE-2024-0567 Référence CVE CVE-2024-0727 https://www.cve.org/CVERecord?id=CVE-2024-0727 Référence CVE CVE-2024-0760 https://www.cve.org/CVERecord?id=CVE-2024-0760 Référence CVE CVE-2024-10041 https://www.cve.org/CVERecord?id=CVE-2024-10041

Official advisory

CERT-FR · French · CERTFR-2025-AVI-0492Multiples vulnérabilités dans les produits Siemens

ures à V3.1 SCALANCE XRM334 (2x230 V AC, 12xFO) (6GK5334-3TS01-4AR3) versions antérieures à V3.2 SCALANCE XRM334 (2x230 V AC, 8xFO) (6GK5334-2TS01-4AR3) versions antérieures à V3.1 SCALANCE XRM334 (2x230 V AC, 8xFO) (6GK5334-2TS01-4AR3) versions antérieures à V3.2 SCALANCE XRM334 (2x230V AC, 2x10G, 24xSFP, 8xSFP+) (6GK5334-5TS01-4AR3) versions antérieures à V3.1 SCALANCE XRM334 (2x230V AC, 2x10G, 24xSFP, 8xSFP+) (6GK5334-5TS01-4AR3) versions antérieures à V3.2 SIMATIC S7-1500 versions supérieures ou égales àV3.1.5 pour les vulnérabilités CVE-2021-41617, CVE-2023-4527, CVE-2023-4806, CVE-2023-4911, CVE-2023-5363, CVE-2023-6246, CVE-2023-6779, CVE-2023-6780, CVE-2023-28531, CVE-2023-38545, CVE-2023-38546, CVE-2023-44487, CVE-2023-46218, CVE-2023-46219, CVE-2023-48795, CVE-2023-51384, CVE-2023-51385, CVE-2023-52927, CVE-2024-2961, CVE-2024-6119, CVE-2024-6387, CVE-2024-12133, CVE-2024-12243, CVE-2024-24855, CVE-2024-26596, CVE-2024-28085, CVE-2024-33599, CVE-2024-33600, CVE-2024-33601, CVE-2024-33602, CVE-2024-34397, CVE-2024-37370, CVE-2024-37371, CVE-2024-45490, CVE-2024-45491, CVE-2024-45492, CVE-2024-50246, CVE-2024-53166, CVE-2024-57977, CVE-2024-57996, CVE-2024-58005, CVE-2025-4373, CVE-2025-4598, CVE-2025-21701, CVE-2025-21702, CVE-2025-21712, CVE-2025-21724, CVE-2025-21728, CVE-2025-2174

Official advisory

NCSC-NL · Dutch · NCSC-2025-0187Kwetsbaarheden verholpen in Siemens producten

De kwetsbaarheden stellen een kwaadwillende mogelijk in staat aanvallen uit te voeren die kunnen leiden tot de volgende categorieën schade: - Denial-of-Service (DoS) - Manipulatie van gegevens - Omzeilen van een beveiligingsmaatregel - Omzeilen van authenticatie - (Remote) code execution (root/admin rechten) - (Remote) code execution (Gebruikersrechten) - Toegang tot systeemgegevens - Toegang tot gevoelige gegevens - Spoofing De kwaadwillende heeft hiervoor toegang nodig tot de productieomgeving. Het is goed gebruik een dergelijke omgeving niet publiek toegankelijk te hebben.

Official advisory

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) >= V3.1.5; SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= V3.1.5; SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) >= V3.1.5; SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) >= V3.1.5; SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) >= V3.1.5
Fixed: 2.39
Action: Review the linked authoritative reference and apply the recorded fixed release appropriate to the affected product branch.
Workaround: Limit access to the interactive shell of the additional GNU/Linux subssytem to trusted personnel only.

Evidence and provenance

Published 31 Jan 2024 · Last source change 14 Jul 2026, 12:03 UTC · CWE-131 · Incorrect Calculation of Buffer Size

CVE recordCVE.org · 5.2

CVSS sourceCNA

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-2023-58992

Product sourceVendor CSAF · Siemens ProductCERT

Remediation sourceVendor CSAF · Siemens ProductCERT

CWE sourceCNA

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.

2024-01-31CVE published

2026-07-14Fixed release or patch reference recorded

ENISA EUVD · EUVD-2023-58992↗Vendor CSAF · Siemens ProductCERT↗CISA Vulnrichment SSVC evidence↗Public exploit reference↗Public exploit 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.

Glibc: integer overflow in __vsyslog_internal()

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

EUVD-2023-58992

What, why and how

Exploit reality and attack path

Official authority intelligence

Patch and workaround

Evidence and provenance

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