CVE-2023-6779
Glibc: off-by-one heap-based buffer overflow in __vsyslog_internal()
HIGH 7.5EPSS 3.2%
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
- Fedora · glibc
- CVSS v3.1 NVD
- 7.5 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - CVSS v3.1 REDHAT
- 8.2 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H - EPSS
- 3.15% chance of exploitation in the next 30 days, 88th percentile
- Published
- 2024-01-31
- Updated
- 2026-10-14
Proof-of-concept exploits (2)
- http://packetstormsecurity.com/files/176932/glibc-syslog-Heap-Based-Buffer-Overflow.html
- http://seclists.org/fulldisclosure/2024/Feb/3
Security advisories
- https://access.redhat.com/security/cve/CVE-2023-6779
- https://security.gentoo.org/glsa/202402-01
- https://security.netapp.com/advisory/ntap-20240223-0006
- https://www.qualys.com/2024/01/30/cve-2023-6246/syslog.txt
- https://bugzilla.redhat.com/show_bug.cgi?id=2254395