CVE-2023-6779
Glibc: off-by-one heap-based buffer overflow in __vsyslog_internal()
CVSS Score
8.2
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-122 |
| Vendor | n/a |
| Product | glibc |
| Published | Jan 31, 2024 |
| Last Updated | Jun 13, 2025 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
High
Affected Versions
n/a / glibc
All versions affected Red Hat / Red Hat Enterprise Linux 6
All versions affected Red Hat / Red Hat Enterprise Linux 6
All versions affected Red Hat / Red Hat Enterprise Linux 7
All versions affected Red Hat / Red Hat Enterprise Linux 7
All versions affected Red Hat / Red Hat Enterprise Linux 8
All versions affected Red Hat / Red Hat Enterprise Linux 9
All versions affected Fedora / Fedora
All versions affected References
packetstormsecurity.com: http://packetstormsecurity.com/files/176932/glibc-syslog-Heap-Based-Buffer-Overflow.html seclists.org: http://seclists.org/fulldisclosure/2024/Feb/3 access.redhat.com: https://access.redhat.com/security/cve/CVE-2023-6779 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2254395 lists.fedoraproject.org: https://lists.fedoraproject.org/archives/list/[email protected]/message/D2FIH77VHY3KCRROCXOT6L27WMZXSJ2G/ lists.fedoraproject.org: https://lists.fedoraproject.org/archives/list/[email protected]/message/MWQ6BZJ6CV5UAW4VZSKJ6TO4KIW2KWAQ/ security.gentoo.org: https://security.gentoo.org/glsa/202402-01 openwall.com: https://www.openwall.com/lists/oss-security/2024/01/30/6 qualys.com: https://www.qualys.com/2024/01/30/cve-2023-6246/syslog.txt security.netapp.com: https://security.netapp.com/advisory/ntap-20240223-0006/
Credits
Red Hat would like to thank Qualys Threat Research Unit for reporting this issue.