CVE-2023-6779

Glibc: off-by-one heap-based buffer overflow in __vsyslog_internal()

HIGH
7.5
CVSS Score
Published: January 31, 2024 at 02:07 PM UTC
Updated: October 14, 2026 at 10:15 PM UTC
5 products affected across 3 vendorsFedoraGlibcSIMATIC S7-1500 CPU 1518-4 Pn /dp MFP Firmware

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Severity
HIGH7.5
Exploit prediction
EPSS 3%
SSVC
No known exploit

Description

An off-by-one heap-based buffer 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 message bigger than INT_MAX bytes, leading to an incorrect calculation of the buffer size to store the message, resulting in an application crash. This issue affects glibc 2.37 and newer.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-122CWE-787

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