CVE-2023-6779 HIGH

CVE-2023-6779: Glibc: off-by-one heap-based buffer overflow in __vsyslog_internal()

Vendor Red Hat
Product Red Hat Enterprise Linux 6
Weakness CWE-122
Published January 31, 2024
Last update May 12, 2026

CVSS base score

8.2/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity Low

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

January 31, 2024 CVE published
May 12, 2026 Record updated