CVE-2023-6779

Name: CVE-2023-6779
Creator: NVD / NIST
Published: 2024-01-31T14:15:48.7+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 3.13%

Last modified Jun 17, 2026

CVE-2023-6779 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 3.13% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

3.13%

86.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Gnu	Glibc	>= 2.37, < 2.39
Fedoraproject	Fedora	38
Fedoraproject	Fedora	39

References

http://packetstormsecurity.com/files/176932/glibc-syslog-Heap-Based-Buffer-Overflow.htmlExploit, Third Party Advisory, VDB Entry
http://seclists.org/fulldisclosure/2024/Feb/3Exploit, Mailing List, Third Party Advisory
https://access.redhat.com/security/cve/CVE-2023-6779Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2254395Issue Tracking
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/D2FIH77VHY3KCRROCXOT6L27WMZXSJ2G/Mailing List
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MWQ6BZJ6CV5UAW4VZSKJ6TO4KIW2KWAQ/Mailing List
https://security.gentoo.org/glsa/202402-01Third Party Advisory
https://security.netapp.com/advisory/ntap-20240223-0006/Third Party Advisory
https://www.openwall.com/lists/oss-security/2024/01/30/6Exploit, Mailing List
https://www.qualys.com/2024/01/30/cve-2023-6246/syslog.txtThird Party Advisory
http://packetstormsecurity.com/files/176932/glibc-syslog-Heap-Based-Buffer-Overflow.htmlExploit, Third Party Advisory, VDB Entry
http://seclists.org/fulldisclosure/2024/Feb/3Exploit, Mailing List, Third Party Advisory
https://access.redhat.com/security/cve/CVE-2023-6779Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2254395Issue Tracking
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/D2FIH77VHY3KCRROCXOT6L27WMZXSJ2G/Mailing List
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MWQ6BZJ6CV5UAW4VZSKJ6TO4KIW2KWAQ/Mailing List
https://security.gentoo.org/glsa/202402-01Third Party Advisory
https://security.netapp.com/advisory/ntap-20240223-0006/Third Party Advisory
https://www.openwall.com/lists/oss-security/2024/01/30/6Exploit, Mailing List
https://www.qualys.com/2024/01/30/cve-2023-6246/syslog.txtThird Party Advisory
https://cert-portal.siemens.com/productcert/html/ssa-082556.html

Timeline

Published: Jan 31, 2024
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-6779?

How severe is CVE-2023-6779?

CVE-2023-6779 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 3.13% probability of exploitation in the next 30 days.

How do I fix CVE-2023-6779?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-6779?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST