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CVE-2023-6779

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

Published: Jan 31, 2024Updated: May 12, 2026 Sources: CVE List NVD BDU csafCWE-122
NVD MITRE
8.2CVSSHIGH
EPSS Score
3.1%
Top 13.8%
CISA KEV
Not in KEV
Exploits
2 Known
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:LA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:HAvailability
High
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Weaknesses

CWE-122CWE-787

Affected Products

glibcgnuOSS Libraries
fedorafedoraproject
On-premOS
Operating Systems / linux-distro
glibcn/a
Red Hat Enterprise Linux 6Red Hat
On-premOS
Operating Systems / linux-distro
Red Hat Enterprise Linux 7Red Hat
On-premOS
Operating Systems / linux-distro
gnuoss-projectUSOSS Librariesaka g. nu
fedoraprojectoss-projectUSOperating Systemsaka fedora project
red hatcommercialUSOperating Systemsaka red hat
and 7 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

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Exploitability

2 exploit sources identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available

MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

References

http://packetstormsecurity.com/files/176932/glibc-syslog-Heap-Based-Buffer-Overflow.html
packetstormsecurity.com
http://seclists.org/fulldisclosure/2024/Feb/3
seclists.org
https://access.redhat.com/security/cve/CVE-2023-6779
access.redhat.com
and 264 more references View all →

Timeline

Published
Jan 31, 2024
Last Updated
May 12, 2026

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