CVE-2023-6779
Glibc: off-by-one heap-based buffer overflow in __vsyslog_internal()
- Published
- Updated
- Reserved
- Assigned by
- redhat
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| redhatCNA (assigner) | 3.1 | High8.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H |
| NVDNVD · Modified | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 3.2% · top 12% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.2.
Weakness
Affected products
glibc
- unaffected 2.39
Red Hat · Red Hat Enterprise Linux 6
All versions: unaffected
Red Hat · Red Hat Enterprise Linux 6
All versions: unaffected
Red Hat · Red Hat Enterprise Linux 7
All versions: unaffected
Red Hat · Red Hat Enterprise Linux 7
All versions: unaffected
Red Hat · Red Hat Enterprise Linux 8
All versions: unaffected
Red Hat · Red Hat Enterprise Linux 9
All versions: unaffected
All versions: affected
References (11)
- http://packetstormsecurity.com/files/176932/glibc-syslog-Heap-Based-Buffer-Overflow.html (opens in a new tab)x_transferred
- http://seclists.org/fulldisclosure/2024/Feb/3 (opens in a new tab)x_transferred
- https://access.redhat.com/security/cve/CVE-2023-6779 (opens in a new tab)vdb-entryx_refsource_REDHATx_transferred
- RHBZ#2254395 (opens in a new tab)issue-trackingx_refsource_REDHATx_transferred
- https://lists.fedoraproject.org/archives/list/[email protected]/message/D2FIH77VHY3KCRROCXOT6L27WMZXSJ2G/ (opens in a new tab)x_transferred
- https://lists.fedoraproject.org/archives/list/[email protected]/message/MWQ6BZJ6CV5UAW4VZSKJ6TO4KIW2KWAQ/ (opens in a new tab)x_transferred
- https://security.gentoo.org/glsa/202402-01 (opens in a new tab)x_transferred
- https://www.openwall.com/lists/oss-security/2024/01/30/6 (opens in a new tab)x_transferred
- https://www.qualys.com/2024/01/30/cve-2023-6246/syslog.txt (opens in a new tab)x_transferred
- https://security.netapp.com/advisory/ntap-20240223-0006/ (opens in a new tab)x_transferred
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2023-6779)Record last updated .