{"id":"CVE-2013-4123","url":"https://www.cyber-defence.io/tools/cve/CVE-2013-4123","generatedAt":"2026-11-05T07:20:29.364Z","title":"client_side_request.cc in Squid 3.2.x before 3.2.13 and 3.3.x before 3.3.8 allows remote attackers to cause a denial of service via a crafted port number in a HTTP Host header.","description":"client_side_request.cc in Squid 3.2.x before 3.2.13 and 3.3.x before 3.3.8 allows remote attackers to cause a denial of service via a crafted port number in a HTTP Host header.","published":"2013-09-16T19:14:38.000Z","lastModified":"2026-06-16T23:56:40.000Z","status":"Modified","sourceIdentifier":"secalert@redhat.com","cvss":{"version":"2.0","score":5,"severity":"MEDIUM","vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P"},"cwe":["CWE-20"],"affected":["squid-cache/squid","opensuse/opensuse"],"epss":{"score":0.80451,"percentile":0.99624,"date":"2026-11-04","history":[]},"kev":{"listed":false},"exploits":{"count":1,"verified":true,"firstPublished":"2013-07-16","source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[{"edbId":26886,"kind":"exploit","title":"Squid 3.3.5 - Denial of Service (PoC)","url":"https://www.exploit-db.com/exploits/26886","sourceUrl":"https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/linux/dos/26886.pl","file":"exploits/linux/dos/26886.pl","published":"2013-07-16","added":"2013-07-16","updated":"2013-07-16","author":"kingcope","type":"dos","platform":"linux","port":null,"verified":true,"codes":["CVE-2013-4123"],"tags":null,"aliases":null,"applicationUrl":null,"screenshotUrl":null,"referenceUrl":null}]},"verdict":{"level":"urgent","text":"EPSS puts the probability of exploitation in the next 30 days at 80.5%, higher than 100% of all known CVEs. Patch or mitigate before the next change window."},"changes":[],"references":[{"url":"http://lists.opensuse.org/opensuse-updates/2013-09/msg00024.html","source":"secalert@redhat.com"},{"url":"http://secunia.com/advisories/54142","tags":["Vendor Advisory"],"source":"secalert@redhat.com"},{"url":"http://secunia.com/advisories/54834","source":"secalert@redhat.com"},{"url":"http://www.squid-cache.org/Advisories/SQUID-2013_3.txt","tags":["Vendor Advisory"],"source":"secalert@redhat.com"},{"url":"http://www.squid-cache.org/Versions/v3/3.2/changesets/squid-3.2-11826.patch","tags":["Patch"],"source":"secalert@redhat.com"},{"url":"http://www.squid-cache.org/Versions/v3/3.3/changesets/squid-3.3-12591.patch","source":"secalert@redhat.com"},{"url":"http://lists.opensuse.org/opensuse-updates/2013-09/msg00024.html","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://secunia.com/advisories/54142","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://secunia.com/advisories/54834","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.squid-cache.org/Advisories/SQUID-2013_3.txt","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.squid-cache.org/Versions/v3/3.2/changesets/squid-3.2-11826.patch","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.squid-cache.org/Versions/v3/3.3/changesets/squid-3.3-12591.patch","source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2013-4123","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."}