{"schemaVersion":3,"id":"CVE-2023-6779","aliases":["UBUNTU-CVE-2023-6779","DEBIAN-CVE-2023-6779","CGA-2mp2-f4f8-qw5m","CGA-967f-mvm4-mr8p"],"status":"published","duplicateOf":null,"title":null,"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.","dates":{"published":"2024-01-31T14:07:41.967Z","modified":"2026-10-14T22:15:19.456Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":8.2,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":8.2,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":8.2,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","exploitability":10,"impact":7,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Debian","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":10,"impact":6,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Wolfi","score":8.2,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","exploitability":10,"impact":7,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Chainguard","score":8.2,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","exploitability":10,"impact":7,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.03153,"percentile":0.87774,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-19T00:00:00.000Z","baselineScore":0.03153},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.03153,"percentile":0.87774}],"last30":[{"date":"2026-09-19T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.03153,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.03153,"percentile":0.87774}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[{"id":"REF_F58D52D54217AC90","name":"Exploit Reference (packetstormsecurity.com)","source":"reference","url":"http://packetstormsecurity.com/files/176932/glibc-syslog-Heap-Based-Buffer-Overflow.html","maturity":"unknown","reliabilityScore":0.2,"verified":false,"type":null,"platforms":[],"requiresAuth":null,"exploitdb":null,"metasploit":null},{"id":"REF_D703905763F04BDD","name":"Exploit Reference (seclists.org)","source":"reference","url":"http://seclists.org/fulldisclosure/2024/Feb/3","maturity":"unknown","reliabilityScore":0.2,"verified":false,"type":null,"platforms":[],"requiresAuth":null,"exploitdb":null,"metasploit":null},{"id":"REF_F130A65AD1CD9A01","name":"Exploit Reference (openwall.com)","source":"reference","url":"https://www.openwall.com/lists/oss-security/2024/01/30/6","maturity":"unknown","reliabilityScore":0.2,"verified":false,"type":null,"platforms":[],"requiresAuth":null,"exploitdb":null,"metasploit":null}],"exploitCount":3,"weaknesses":[{"id":"CWE-787","name":"Out-of-bounds Write","description":"The product writes data past the end, or before the beginning, of the intended buffer.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/787.html"},{"id":"CWE-122","name":"Heap-based Buffer Overflow","description":"A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().","type":"weakness","status":"Draft","abstraction":"Variant","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/122.html"}],"affected":[{"vendor":"chainguard","product":"glibc","name":"glibc","label":"glibc","ecosystem":"Chainguard","cpePart":null,"purl":"pkg:apk/chainguard/glibc","purlType":"apk","versions":[{"text":"< 2.38-r11","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2.38-r11","eol":null,"hubHref":null},{"vendor":"wolfi","product":"glibc","name":"glibc","label":"glibc","ecosystem":"Wolfi","cpePart":null,"purl":"pkg:apk/wolfi/glibc","purlType":"apk","versions":[{"text":"< 2.38-r11","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2.38-r11","eol":null,"hubHref":null},{"vendor":"debian","product":"glibc","name":"glibc","label":"glibc","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/glibc","purlType":"deb","versions":[{"text":"< 2.36-9+deb12u4","noFixRecorded":false,"fixedIn":null},{"text":"< 2.37-15","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2.36-9+deb12u4 | < 2.37-15","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"glibc","name":"glibc","label":"glibc","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/glibc","purlType":"deb","versions":[{"text":"< 2.39-0ubuntu1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2.39-0ubuntu1","eol":null,"hubHref":null},{"vendor":"fedoraproject","product":"fedora","name":"fedora","label":"fedora","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"38","noFixRecorded":false,"fixedIn":null},{"text":"39","noFixRecorded":false,"fixedIn":null}],"versionsText":"38 | 39","eol":{"isEol":true,"eolDate":"2024-05-21T00:00:00.000Z","matchMethod":"cpe","cycle":{"name":"38","label":"38","eolFrom":"2024-05-21T00:00:00.000Z","isLts":false,"isMaintained":false,"latestVersion":null},"product":{"name":"fedora","label":"Fedora Linux","category":"os"}},"hubHref":"/vendor/fedoraproject/fedora"},{"vendor":"gnu","product":"glibc","name":"glibc","label":"glibc","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 2.37, < 2.39","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 2.37, < 2.39","eol":null,"hubHref":"/vendor/gnu/glibc"}],"affectedCount":6,"eol":{"hasEol":true,"count":1},"references":[{"url":"http://packetstormsecurity.com/files/176932/glibc-syslog-Heap-Based-Buffer-Overflow.html","label":"packetstormsecurity.com/files/176932/glibc-syslog-Heap-Based-Buffer-Overflow.html","hostname":"packetstormsecurity.com","tags":["WEB","Exploit","Third Party Advisory","VDB Entry"]},{"url":"http://seclists.org/fulldisclosure/2024/Feb/3","label":"seclists.org/fulldisclosure/2024/Feb/3","hostname":"seclists.org","tags":["WEB","Exploit","Mailing List","Third Party Advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2023-6779","label":"access.redhat.com/security/cve/CVE-2023-6779","hostname":"access.redhat.com","tags":["VDB Entry","X Refsource REDHAT","Advisory","Third Party Advisory"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2254395","label":"bugzilla.redhat.com/show_bug.cgi?id=2254395","hostname":"bugzilla.redhat.com","tags":["Issue Tracking","X Refsource REDHAT","REPORT"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/D2FIH77VHY3KCRROCXOT6L27WMZXSJ2G/","label":"lists.fedoraproject.org/archives/…","hostname":"lists.fedoraproject.org","tags":["WEB","Mailing List"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MWQ6BZJ6CV5UAW4VZSKJ6TO4KIW2KWAQ/","label":"lists.fedoraproject.org/archives/…","hostname":"lists.fedoraproject.org","tags":["WEB","Mailing List"]},{"url":"https://security.gentoo.org/glsa/202402-01","label":"security.gentoo.org/glsa/202402-01","hostname":"security.gentoo.org","tags":["Advisory","Third Party Advisory"]},{"url":"https://www.openwall.com/lists/oss-security/2024/01/30/6","label":"www.openwall.com/lists/oss-security/2024/01/30/6","hostname":"www.openwall.com","tags":["WEB","Exploit","Mailing List"]},{"url":"https://www.qualys.com/2024/01/30/cve-2023-6246/syslog.txt","label":"www.qualys.com/2024/01/30/cve-2023-6246/syslog.txt","hostname":"www.qualys.com","tags":["REPORT","WEB","Third Party Advisory"]},{"url":"https://security.netapp.com/advisory/ntap-20240223-0006/","label":"security.netapp.com/advisory/ntap-20240223-0006/","hostname":"security.netapp.com","tags":["Advisory","Third Party Advisory"]},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-082556.html","label":"cert-portal.siemens.com/productcert/html/ssa-082556.html","hostname":"cert-portal.siemens.com","tags":["WEB"]},{"url":"https://ubuntu.com/security/CVE-2023-6779","label":"ubuntu.com/security/CVE-2023-6779","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/notices/USN-6620-1","label":"ubuntu.com/security/notices/USN-6620-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2023-6779","label":"www.cve.org/CVERecord?id=CVE-2023-6779","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2023-6779","label":"security-tracker.debian.org/tracker/CVE-2023-6779","hostname":"security-tracker.debian.org","tags":["Advisory"]},{"url":"https://access.redhat.com/downloads/content/package-browser/","label":"access.redhat.com/downloads/content/package-browser/","hostname":"access.redhat.com","tags":["WEB"]},{"url":"https://packages.fedoraproject.org/","label":"packages.fedoraproject.org","hostname":"packages.fedoraproject.org","tags":["WEB"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/6xxx/CVE-2023-6779.json","label":"github.com/CVEProject/cvelistV5/tree/main/cves/2023/6xxx/CVE-2023-6779.json","hostname":"github.com","tags":["Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-6779","label":"nvd.nist.gov/vuln/detail/CVE-2023-6779","hostname":"nvd.nist.gov","tags":["Advisory","Oval"]}],"lineage":{"upstream":[],"downstream":["DSA-5611-1","MGASA-2024-0026"],"duplicates":[],"related":["CGA-99FV-6VGF-MMR2","CGA-WQQ4-865P-C7Q6","USN-6620-1"]},"timeline":[{"kind":"published","date":"2024-01-31T14:07:41.967Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-10-14T22:15:19.456Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":43,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-19T19:57:10.085Z","stale":false,"partial":false}}