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Vulnerability record · CVE-2023-6780 · published 31 January 2024

CVE-2023-6780: Gnu glibc integer overflow vulnerability

Gnu · Glibc

An integer 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 very long message, leading to an incorrect calculation of the buffer size to store the message, resulting in undefined behavior. This issue affects glibc 2.37 and newer.

5.3 CVSS 3.1 Medium EPSS 2.7% · top 14.6% CWE-131 · CWE-131CWE-190 · Integer overflow
5.3CVSS 3.1 base score
2.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
20References, 6 tagged exploit
17 Jun 2026Last modified by NVD

Description

An integer 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 very long message, leading to an incorrect calculation of the buffer size to store the message, resulting in undefined behavior. This issue affects glibc 2.37 and newer.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://packetstormsecurity.com/files/176932/glibc-syslog-Heap-Based-Buffer-Overflow.html ExploitThird Party AdvisoryVDB Entry
http://seclists.org/fulldisclosure/2024/Feb/3 ExploitMailing ListThird Party Advisory
https://access.redhat.com/security/cve/CVE-2023-6780 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2254396 Issue Tracking
https://lists.fedoraproject.org/archives/list/[email protected]/message/D2FIH77VHY3KCRROCXOT6L27W Mailing List
https://lists.fedoraproject.org/archives/list/[email protected]/message/MWQ6BZJ6CV5UAW4VZSKJ6TO4K Mailing List
https://security.gentoo.org/glsa/202402-01 Third Party Advisory
https://www.openwall.com/lists/oss-security/2024/01/30/6 ExploitMailing List
https://www.qualys.com/2024/01/30/cve-2023-6246/syslog.txt Third Party Advisory
http://packetstormsecurity.com/files/176932/glibc-syslog-Heap-Based-Buffer-Overflow.html ExploitThird Party AdvisoryVDB Entry
http://seclists.org/fulldisclosure/2024/Feb/3 ExploitMailing ListThird Party Advisory
https://access.redhat.com/security/cve/CVE-2023-6780 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2254396 Issue Tracking
https://lists.fedoraproject.org/archives/list/[email protected]/message/D2FIH77VHY3KCRROCXOT6L27W Mailing List
https://lists.fedoraproject.org/archives/list/[email protected]/message/MWQ6BZJ6CV5UAW4VZSKJ6TO4K Mailing List
https://security.gentoo.org/glsa/202402-01 Third Party Advisory
https://security.netapp.com/advisory/ntap-20250207-0010/
https://www.openwall.com/lists/oss-security/2024/01/30/6 ExploitMailing List
https://www.qualys.com/2024/01/30/cve-2023-6246/syslog.txt Third Party Advisory
https://cert-portal.siemens.com/productcert/html/ssa-082556.html

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Source: NIST National Vulnerability Database (record CVE-2023-6780), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.