{"id":"CVE-2023-6779","title":"Glibc: off-by-one heap-based buffer overflow in __vsyslog_internal()","summary":"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 big…","severity":"high","cvss":8.2,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","cvssSource":"cna","cwe":["CWE-122"],"vendor":"Red Hat","product":"glibc","affected":["glibc","compat-glibc","glibc","compat-glibc","glibc","glibc","glibc","glibc (all versions)"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2025-06-13T16:08:30.700931Z"},"published":"2024-01-31","updated":"2026-10-14","sourceUpdated":"2026-10-14T22:15:19.456Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2023-6779","references":[{"url":"http://packetstormsecurity.com/files/176932/glibc-syslog-Heap-Based-Buffer-Overflow.html"},{"url":"http://seclists.org/fulldisclosure/2024/Feb/3"},{"url":"https://access.redhat.com/security/cve/CVE-2023-6779"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2254395","label":"RHBZ#2254395"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/D2FIH77VHY3KCRROCXOT6L27WMZXSJ2G/"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MWQ6BZJ6CV5UAW4VZSKJ6TO4KIW2KWAQ/"},{"url":"https://security.gentoo.org/glsa/202402-01"},{"url":"https://www.openwall.com/lists/oss-security/2024/01/30/6"},{"url":"https://www.qualys.com/2024/01/30/cve-2023-6246/syslog.txt"},{"url":"https://security.netapp.com/advisory/ntap-20240223-0006/"}],"tags":["cve.org"],"epss":0.03153,"epssPercentile":0.8771,"ingestedAt":"2026-10-15T04:46:37.153Z","slug":"CVE-2023-6779","body":"## Overview\n\nAn 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.\n\n## Affected\n\n- `glibc`\n- `compat-glibc`\n- `glibc`\n- `compat-glibc`\n- `glibc`\n- `glibc`\n- `glibc`\n- `glibc (all versions)`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":46,"depthScoreParts":{"impact":45.1,"likelihood":0.6,"exploitation":0,"ransomware":0},"changes":[]}