{"id":"CVE-2009-0478","url":"https://www.cyber-defence.io/tools/cve/CVE-2009-0478","generatedAt":"2026-10-27T20:41:32.645Z","title":"Squid 2.7 to 2.7.STABLE5, 3.0 to 3.0.STABLE12, and 3.1 to 3.1.0.4 allows remote attackers to cause a denial of service via an HTTP request with an invalid version number, which triggers a reachable assertion in (1) HttpMsg.c and (2) HttpStatusLine.c.","description":"Squid 2.7 to 2.7.STABLE5, 3.0 to 3.0.STABLE12, and 3.1 to 3.1.0.4 allows remote attackers to cause a denial of service via an HTTP request with an invalid version number, which triggers a reachable assertion in (1) HttpMsg.c and (2) HttpStatusLine.c.","published":"2009-02-08T22:30:00.000Z","lastModified":"2026-06-16T23:05:08.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","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/squid"],"epss":{"score":0.71986,"percentile":0.99425,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":1,"verified":true,"firstPublished":"2009-02-09","source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[{"edbId":8021,"kind":"exploit","title":"Squid < 3.1 5 - HTTP Version Number Parsing Denial of Service","url":"https://www.exploit-db.com/exploits/8021","sourceUrl":"https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/multiple/dos/8021.pl","file":"exploits/multiple/dos/8021.pl","published":"2009-02-09","added":"2009-02-08","updated":null,"author":"Praveen Darshanam","type":"dos","platform":"multiple","port":null,"verified":true,"codes":["OSVDB-51810","CVE-2009-0478"],"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 72.0%, higher than 99% of all known CVEs. Patch or mitigate before the next change window."},"changes":[],"references":[{"url":"http://lists.opensuse.org/opensuse-security-announce/2009-03/msg00000.html","source":"cve@mitre.org"},{"url":"http://secunia.com/advisories/33731","tags":["Vendor Advisory"],"source":"cve@mitre.org"},{"url":"http://secunia.com/advisories/34467","tags":["Vendor Advisory"],"source":"cve@mitre.org"},{"url":"http://security.gentoo.org/glsa/glsa-200903-38.xml","source":"cve@mitre.org"},{"url":"http://www.mandriva.com/security/advisories?name=MDVSA-2009:034","source":"cve@mitre.org"},{"url":"http://www.securityfocus.com/archive/1/500653/100/0/threaded","source":"cve@mitre.org"},{"url":"http://www.securityfocus.com/bid/33604","tags":["Exploit","Patch"],"source":"cve@mitre.org"},{"url":"http://www.securitytracker.com/id?1021684","source":"cve@mitre.org"},{"url":"http://www.squid-cache.org/Advisories/SQUID-2009_1.txt","tags":["Vendor Advisory"],"source":"cve@mitre.org"},{"url":"http://www.squid-cache.org/Versions/v2/2.7/changesets/12432.patch","tags":["Vendor Advisory"],"source":"cve@mitre.org"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=484246","source":"cve@mitre.org"},{"url":"https://www.exploit-db.com/exploits/8021","source":"cve@mitre.org"},{"url":"http://lists.opensuse.org/opensuse-security-announce/2009-03/msg00000.html","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://secunia.com/advisories/33731","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://secunia.com/advisories/34467","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://security.gentoo.org/glsa/glsa-200903-38.xml","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.mandriva.com/security/advisories?name=MDVSA-2009:034","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securityfocus.com/archive/1/500653/100/0/threaded","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securityfocus.com/bid/33604","tags":["Exploit","Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securitytracker.com/id?1021684","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.squid-cache.org/Advisories/SQUID-2009_1.txt","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.squid-cache.org/Versions/v2/2.7/changesets/12432.patch","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=484246","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.exploit-db.com/exploits/8021","source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2009-0478","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."}