{"id":"CVE-2015-3183","url":"https://www.cyber-defence.io/tools/cve/CVE-2015-3183","generatedAt":"2026-11-05T06:03:57.257Z","title":"The chunked transfer coding implementation in the Apache HTTP Server before 2.4.14 does not properly parse chunk headers, which allows remote attackers to conduct HTTP request smuggling attacks via a crafted request, related to mishandling of large…","description":"The chunked transfer coding implementation in the Apache HTTP Server before 2.4.14 does not properly parse chunk headers, which allows remote attackers to conduct HTTP request smuggling attacks via a crafted request, related to mishandling of large chunk-size values and invalid chunk-extension characters in modules/http/http_filters.c.","published":"2015-07-20T23:59:03.000Z","lastModified":"2026-06-17T00:25:29.000Z","status":"Modified","sourceIdentifier":"secalert@redhat.com","cvss":{"version":"2.0","score":5,"severity":"MEDIUM","vector":"AV:N/AC:L/Au:N/C:N/I:P/A:N"},"cwe":["CWE-17","CWE-20"],"affected":["apache/http server"],"epss":{"score":0.74387,"percentile":0.99493,"date":"2026-11-04","history":[{"date":"2026-10-22","score":0.74538,"percentile":0.99499}]},"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 74.4%, higher than 99% of all known CVEs. Patch or mitigate before the next change window."},"changes":[],"references":[{"url":"http://httpd.apache.org/security/vulnerabilities_24.html","tags":["Vendor Advisory"],"source":"secalert@redhat.com"},{"url":"http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10735","tags":["Third Party Advisory"],"source":"secalert@redhat.com"},{"url":"http://lists.apple.com/archives/security-announce/2015/Aug/msg00001.html","tags":["Mailing List"],"source":"secalert@redhat.com"},{"url":"http://lists.apple.com/archives/security-announce/2015/Sep/msg00004.html","tags":["Mailing List"],"source":"secalert@redhat.com"},{"url":"http://lists.opensuse.org/opensuse-updates/2015-10/msg00011.html","tags":["Third Party Advisory"],"source":"secalert@redhat.com"},{"url":"http://marc.info/?l=bugtraq&m=144493176821532&w=2","tags":["Mailing List","Third Party Advisory","VDB Entry"],"source":"secalert@redhat.com"},{"url":"http://rhn.redhat.com/errata/RHSA-2015-1666.html","tags":["Third Party 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Entry"],"source":"secalert@redhat.com"},{"url":"http://www.securityfocus.com/bid/91787","tags":["Third Party Advisory","VDB Entry"],"source":"secalert@redhat.com"},{"url":"http://www.securitytracker.com/id/1032967","tags":["Third Party Advisory","VDB Entry"],"source":"secalert@redhat.com"},{"url":"http://www.ubuntu.com/usn/USN-2686-1","tags":["Third Party Advisory"],"source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2015:2659","tags":["Third Party Advisory"],"source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2015:2660","tags":["Third Party Advisory"],"source":"secalert@redhat.com"},{"url":"https://github.com/apache/httpd/commit/a6027e56924bb6227c1fdbf6f91e7e2438338be6","tags":["Third Party Advisory"],"source":"secalert@redhat.com"},{"url":"https://github.com/apache/httpd/commit/e427c41257957b57036d5a549b260b6185d1dd73","tags":["Third Party 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List"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://lists.apple.com/archives/security-announce/2015/Sep/msg00004.html","tags":["Mailing List"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://lists.opensuse.org/opensuse-updates/2015-10/msg00011.html","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://marc.info/?l=bugtraq&m=144493176821532&w=2","tags":["Mailing List","Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://rhn.redhat.com/errata/RHSA-2015-1666.html","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2015-3183","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."}