{"schemaVersion":3,"id":"CVE-2009-2855","aliases":["DEBIAN-CVE-2009-2855"],"status":"published","duplicateOf":null,"title":null,"description":"The strListGetItem function in src/HttpHeaderTools.c in Squid 2.7 allows remote attackers to cause a denial of service via a crafted auth header with certain comma delimiters that trigger an infinite loop of calls to the strcspn function.","dates":{"published":"2009-08-18T20:41:00.000Z","modified":"2024-08-07T06:07:36.421Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":5,"severity":"medium","version":"2.0","versionLabel":"v2.0","source":"NVD","vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","computed":false,"selection":"backend-summary"},"metrics":[{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":5,"severity":"medium","vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.34031,"percentile":0.98389,"severity":"high","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-19T00:00:00.000Z","baselineScore":0.34031},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.34031,"percentile":0.98389}],"last30":[{"date":"2026-09-19T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.34031,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.34031,"percentile":0.98389}]},"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":[],"exploitCount":0,"weaknesses":[{"id":"CWE-20","name":"Improper Input Validation","description":"The product receives input or data, but it does\n        not validate or incorrectly validates that the input has the\n        properties that are required to process the data safely and\n        correctly.","type":"weakness","status":"Stable","abstraction":"Class","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/20.html"}],"affected":[{"vendor":"debian","product":"squid","name":"squid","label":"squid","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/squid","purlType":"deb","versions":[{"text":"< 2.7.STABLE7-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2.7.STABLE7-1","eol":null,"hubHref":null},{"vendor":"squid-cache","product":"squid","name":"squid","label":"squid","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"2.7","noFixRecorded":false,"fixedIn":null},{"text":"2.7:stable3","noFixRecorded":false,"fixedIn":null},{"text":"2.7:stable4","noFixRecorded":false,"fixedIn":null}],"versionsText":"2.7 | 2.7:stable3 | 2.7:stable4","eol":{"isEol":true,"eolDate":"2010-03-14T00:00:00.000Z","matchMethod":"cpe","cycle":{"name":"2.7","label":"2.7","eolFrom":"2010-03-14T00:00:00.000Z","isLts":false,"isMaintained":false,"latestVersion":"2.7.9"},"product":{"name":"squid","label":"Squid","category":"server-app"}},"hubHref":"/vendor/squid-cache/squid"}],"affectedCount":2,"eol":{"hasEol":true,"count":1},"references":[{"url":"http://www.openwall.com/lists/oss-security/2009/08/03/3","label":"www.openwall.com/lists/oss-security/2009/08/03/3","hostname":"www.openwall.com","tags":["Mailing List","X Refsource MLIST"]},{"url":"http://www.securityfocus.com/bid/36091","label":"www.securityfocus.com/bid/36091","hostname":"www.securityfocus.com","tags":["VDB Entry","X Refsource BID"]},{"url":"http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=534982","label":"bugs.debian.org/cgi-bin/bugreport.cgi?bug=534982","hostname":"bugs.debian.org","tags":["X Refsource CONFIRM"]},{"url":"http://www.openwall.com/lists/oss-security/2009/08/04/6","label":"www.openwall.com/lists/oss-security/2009/08/04/6","hostname":"www.openwall.com","tags":["Mailing List","X Refsource MLIST"]},{"url":"http://www.squid-cache.org/bugs/show_bug.cgi?id=2704","label":"www.squid-cache.org/bugs/show_bug.cgi?id=2704","hostname":"www.squid-cache.org","tags":["X Refsource MISC","Vendor Advisory"]},{"url":"http://www.squid-cache.org/bugs/show_bug.cgi?id=2541","label":"www.squid-cache.org/bugs/show_bug.cgi?id=2541","hostname":"www.squid-cache.org","tags":["X Refsource CONFIRM"]},{"url":"http://www.securitytracker.com/id?1022757","label":"www.securitytracker.com/id?1022757","hostname":"www.securitytracker.com","tags":["VDB Entry","X Refsource SECTRACK"]},{"url":"https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10592","label":"oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10592","hostname":"oval.cisecurity.org","tags":["VDB Entry","Signature","X Refsource OVAL"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=518182","label":"bugzilla.redhat.com/show_bug.cgi?id=518182","hostname":"bugzilla.redhat.com","tags":["X Refsource CONFIRM"]},{"url":"http://www.openwall.com/lists/oss-security/2009/07/20/10","label":"www.openwall.com/lists/oss-security/2009/07/20/10","hostname":"www.openwall.com","tags":["Mailing List","X Refsource MLIST"]},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/52610","label":"exchange.xforce.ibmcloud.com/vulnerabilities/52610","hostname":"exchange.xforce.ibmcloud.com","tags":["VDB Entry","X Refsource XF"]},{"url":"http://bugs.debian.org/cgi-bin/bugreport.cgi?msg=31%3Bfilename=diff%3Batt=1%3Bbug=534982","label":"bugs.debian.org/cgi-bin/bugreport.cgi?msg=31%3Bfilename=diff%3Batt=1%3Bbug=534982","hostname":"bugs.debian.org","tags":["X Refsource MISC"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2009-2855","label":"security-tracker.debian.org/tracker/CVE-2009-2855","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":["DSA-1991-1","RHSA-2010:0221"],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2009-08-18T20:41:00.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2024-08-07T06:07:36.421Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":27,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-19T23:01:28.100Z","stale":false,"partial":false}}