{"id":"CVE-2023-39456","url":"https://www.cyber-defence.io/tools/cve/CVE-2023-39456","generatedAt":"2026-11-04T22:55:00.450Z","title":"Improper Input Validation vulnerability in Apache Traffic Server with malformed HTTP/2 frames.This issue affects Apache Traffic Server: from 9.0.0 through 9.2.2.","description":"Improper Input Validation vulnerability in Apache Traffic Server with malformed HTTP/2 frames.This issue affects Apache Traffic Server: from 9.0.0 through 9.2.2.\n\nUsers are recommended to upgrade to version 9.2.3, which fixes the issue.","published":"2023-10-17T07:15:10.000Z","lastModified":"2026-06-17T06:12:22.000Z","status":"Modified","sourceIdentifier":"security@apache.org","cvss":{"version":"3.1","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"},"cwe":["CWE-20"],"affected":["apache/traffic server","fedoraproject/fedora"],"epss":{"score":0.58286,"percentile":0.99096,"date":"2026-11-03","history":[{"date":"2026-10-12","score":0.60538,"percentile":0.99128},{"date":"2026-10-18","score":0.58286,"percentile":0.99089}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"urgent","text":"EPSS puts the probability of exploitation in the next 30 days at 58.3%, higher than 99% of all known CVEs. Patch or mitigate before the next change window."},"changes":[{"kind":"epss","label":"EPSS jump","at":"2026-10-12T00:00:00.000Z","detail":{"to":0.60538,"from":0.53757,"percentile":0.99128},"summary":"EPSS moved from 53.8% to 60.5% probability of exploitation in the next thirty days."}],"references":[{"url":"https://lists.apache.org/thread/5py8h42mxfsn8l1wy6o41xwhsjlsd87q","tags":["Mailing List","Vendor Advisory"],"source":"security@apache.org"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JIZSEFC3YKCGABA2BZW6ZJRMDZJMB7PJ/","tags":["Mailing List"],"source":"security@apache.org"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VHUHTSXLXGXS7JYKBXTA3VINUPHTNGVU/","source":"security@apache.org"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZKQSIKIAT5TJ3WSLU3RDBQ35YX4GY4V3/","tags":["Mailing List"],"source":"security@apache.org"},{"url":"https://www.debian.org/security/2023/dsa-5549","source":"security@apache.org"},{"url":"https://lists.apache.org/thread/5py8h42mxfsn8l1wy6o41xwhsjlsd87q","tags":["Mailing List","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JIZSEFC3YKCGABA2BZW6ZJRMDZJMB7PJ/","tags":["Mailing List"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VHUHTSXLXGXS7JYKBXTA3VINUPHTNGVU/","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZKQSIKIAT5TJ3WSLU3RDBQ35YX4GY4V3/","tags":["Mailing List"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.debian.org/security/2023/dsa-5549","source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2023-39456","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}