{"id":"CVE-2023-6780","title":"Glibc: integer overflow in __vsyslog_internal()","summary":"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…","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","cvssSource":"cna","cwe":["CWE-131"],"vendor":"Red Hat","product":"glibc","affected":["glibc","compat-glibc","glibc","compat-glibc","glibc","glibc","glibc","glibc (all versions)"],"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2024-01-31T16:36:34.378685Z"},"exploitAvailable":true,"published":"2024-01-31","updated":"2026-10-14","sourceUpdated":"2026-10-14T22:15:20.900Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2023-6780","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-2023-6780"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2254396","label":"RHBZ#2254396"},{"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"}],"tags":["cve.org","exploit-available"],"epss":0.02689,"epssPercentile":0.85585,"ingestedAt":"2026-10-15T04:46:37.154Z","slug":"CVE-2023-6780","body":"## Overview\n\nAn 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.\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":42,"depthScoreParts":{"impact":29.2,"likelihood":0.5,"exploitation":12,"ransomware":0},"changes":[]}