{"schemaVersion":3,"id":"CVE-2011-4096","aliases":["RHSA-2011:1791","DSA-2381-1"],"status":"published","duplicateOf":null,"title":null,"description":"The idnsGrokReply function in Squid before 3.1.16 does not properly free memory, which allows remote attackers to cause a denial of service (daemon abort) via a DNS reply containing a CNAME record that references another CNAME record that contains an empty A record.","dates":{"published":"2011-11-17T19:00:00.000Z","modified":"2024-08-06T23:53:32.679Z","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":0.37186,"percentile":0.98513,"severity":"high","asOf":"2026-10-20T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-20T00:00:00.000Z","baselineScore":0.37186},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.37186,"percentile":0.98513}],"last30":[{"date":"2026-09-20T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.37186,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.37186,"percentile":0.98513}]},"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-399","name":"Resource Management Errors","description":"Weaknesses in this category are related to improper management of system resources.","type":"category","status":"Draft","abstraction":null,"likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/399.html"}],"affected":[{"vendor":"debian","product":"squid3","name":"squid3","label":"squid3","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/squid3","purlType":"deb","versions":[{"text":"< 3.1.6-1.2+squeeze2","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 3.1.6-1.2+squeeze2","eol":null,"hubHref":null},{"vendor":"redhat","product":"squid","name":"squid","label":"squid","ecosystem":"Red Hat","cpePart":null,"purl":"pkg:rpm/redhat/squid","purlType":"rpm","versions":[{"text":"< 7:3.1.10-1.el6_2.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 7:3.1.10-1.el6_2.1","eol":null,"hubHref":null},{"vendor":"redhat","product":"squid-debuginfo","name":"squid-debuginfo","label":"squid-debuginfo","ecosystem":"Red Hat","cpePart":null,"purl":"pkg:rpm/redhat/squid-debuginfo","purlType":"rpm","versions":[{"text":"< 7:3.1.10-1.el6_2.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 7:3.1.10-1.el6_2.1","eol":null,"hubHref":null},{"vendor":"squid-cache","product":"squid","name":"squid","label":"squid","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≤ 3.1.15","noFixRecorded":false,"fixedIn":null},{"text":"3.0","noFixRecorded":false,"fixedIn":null},{"text":"3.0:rc1","noFixRecorded":false,"fixedIn":null},{"text":"3.0:rc4","noFixRecorded":false,"fixedIn":null},{"text":"3.0.stable1","noFixRecorded":false,"fixedIn":null},{"text":"3.0.stable2","noFixRecorded":false,"fixedIn":null},{"text":"3.0.stable3","noFixRecorded":false,"fixedIn":null},{"text":"3.0.stable4","noFixRecorded":false,"fixedIn":null},{"text":"3.0.stable5","noFixRecorded":false,"fixedIn":null},{"text":"3.0.stable6","noFixRecorded":false,"fixedIn":null},{"text":"3.0.stable7","noFixRecorded":false,"fixedIn":null},{"text":"3.0.stable8","noFixRecorded":false,"fixedIn":null},{"text":"3.0.stable9","noFixRecorded":false,"fixedIn":null},{"text":"3.0.stable10","noFixRecorded":false,"fixedIn":null},{"text":"3.0.stable11","noFixRecorded":false,"fixedIn":null},{"text":"3.0.stable11:rc1","noFixRecorded":false,"fixedIn":null},{"text":"3.0.stable12","noFixRecorded":false,"fixedIn":null},{"text":"3.0.stable13","noFixRecorded":false,"fixedIn":null},{"text":"3.0.stable14","noFixRecorded":false,"fixedIn":null},{"text":"3.0.stable15","noFixRecorded":false,"fixedIn":null},{"text":"3.0.stable16","noFixRecorded":false,"fixedIn":null},{"text":"3.0.stable16:rc1","noFixRecorded":false,"fixedIn":null},{"text":"3.0.stable17","noFixRecorded":false,"fixedIn":null},{"text":"3.0.stable18","noFixRecorded":false,"fixedIn":null},{"text":"3.0.stable19","noFixRecorded":false,"fixedIn":null},{"text":"3.0.stable20","noFixRecorded":false,"fixedIn":null},{"text":"3.0.stable21","noFixRecorded":false,"fixedIn":null},{"text":"3.0.stable22","noFixRecorded":false,"fixedIn":null},{"text":"3.0.stable23","noFixRecorded":false,"fixedIn":null},{"text":"3.0.stable24","noFixRecorded":false,"fixedIn":null},{"text":"3.0.stable25","noFixRecorded":false,"fixedIn":null},{"text":"3.1","noFixRecorded":false,"fixedIn":null},{"text":"3.1.0.1","noFixRecorded":false,"fixedIn":null},{"text":"3.1.0.2","noFixRecorded":false,"fixedIn":null},{"text":"3.1.0.3","noFixRecorded":false,"fixedIn":null},{"text":"3.1.0.4","noFixRecorded":false,"fixedIn":null},{"text":"3.1.0.5","noFixRecorded":false,"fixedIn":null},{"text":"3.1.0.6","noFixRecorded":false,"fixedIn":null},{"text":"3.1.0.7","noFixRecorded":false,"fixedIn":null},{"text":"3.1.0.8","noFixRecorded":false,"fixedIn":null},{"text":"3.1.0.9","noFixRecorded":false,"fixedIn":null},{"text":"3.1.0.10","noFixRecorded":false,"fixedIn":null},{"text":"3.1.0.11","noFixRecorded":false,"fixedIn":null},{"text":"3.1.0.12","noFixRecorded":false,"fixedIn":null},{"text":"3.1.0.13","noFixRecorded":false,"fixedIn":null},{"text":"3.1.0.14","noFixRecorded":false,"fixedIn":null},{"text":"3.1.0.15","noFixRecorded":false,"fixedIn":null},{"text":"3.1.0.16","noFixRecorded":false,"fixedIn":null},{"text":"3.1.0.17","noFixRecorded":false,"fixedIn":null},{"text":"3.1.0.18","noFixRecorded":false,"fixedIn":null},{"text":"3.1.1","noFixRecorded":false,"fixedIn":null},{"text":"3.1.2","noFixRecorded":false,"fixedIn":null},{"text":"3.1.3","noFixRecorded":false,"fixedIn":null},{"text":"3.1.4","noFixRecorded":false,"fixedIn":null},{"text":"3.1.5","noFixRecorded":false,"fixedIn":null},{"text":"3.1.5.1","noFixRecorded":false,"fixedIn":null},{"text":"3.1.6","noFixRecorded":false,"fixedIn":null},{"text":"3.1.7","noFixRecorded":false,"fixedIn":null},{"text":"3.1.8","noFixRecorded":false,"fixedIn":null},{"text":"3.1.9","noFixRecorded":false,"fixedIn":null},{"text":"3.1.10","noFixRecorded":false,"fixedIn":null},{"text":"3.1.11","noFixRecorded":false,"fixedIn":null},{"text":"3.1.12","noFixRecorded":false,"fixedIn":null},{"text":"3.1.13","noFixRecorded":false,"fixedIn":null},{"text":"3.1.14","noFixRecorded":false,"fixedIn":null}],"versionsText":"≤ 3.1.15 | 3.0 | 3.0:rc1 | 3.0:rc4 | 3.0.stable1 | 3.0.stable2 | 3.0.stable3 | 3.0.stable4 | 3.0.stable5 | 3.0.stable6 | 3.0.stable7 | 3.0.stable8 | 3.0.stable9 | 3.0.stable10 | 3.0.stable11 | 3.0.stable11:rc1 | 3.0.stable12 | 3.0.stable13 | 3.0.stable14 | 3.0.stable15 | 3.0.stable16 | 3.0.stable16:rc1 | 3.0.stable17 | 3.0.stable18 | 3.0.stable19 | 3.0.stable20 | 3.0.stable21 | 3.0.stable22 | 3.0.stable23 | 3.0.stable24 | 3.0.stable25 | 3.1 | 3.1.0.1 | 3.1.0.2 | 3.1.0.3 | 3.1.0.4 | 3.1.0.5 | 3.1.0.6 | 3.1.0.7 | 3.1.0.8 | 3.1.0.9 | 3.1.0.10 | 3.1.0.11 | 3.1.0.12 | 3.1.0.13 | 3.1.0.14 | 3.1.0.15 | 3.1.0.16 | 3.1.0.17 | 3.1.0.18 | 3.1.1 | 3.1.2 | 3.1.3 | 3.1.4 | 3.1.5 | 3.1.5.1 | 3.1.6 | 3.1.7 | 3.1.8 | 3.1.9 | 3.1.10 | 3.1.11 | 3.1.12 | 3.1.13 | 3.1.14","eol":{"isEol":true,"eolDate":"2011-08-27T00:00:00.000Z","matchMethod":"cpe","cycle":{"name":"3.0","label":"3.0","eolFrom":"2011-08-27T00:00:00.000Z","isLts":false,"isMaintained":false,"latestVersion":"3.0.26"},"product":{"name":"squid","label":"Squid","category":"server-app"}},"hubHref":"/vendor/squid-cache/squid"}],"affectedCount":4,"eol":{"hasEol":true,"count":1},"references":[{"url":"http://bugs.squid-cache.org/show_bug.cgi?id=3237#c12","label":"bugs.squid-cache.org/show_bug.cgi?id=3237","hostname":"bugs.squid-cache.org","tags":["X Refsource MISC"]},{"url":"http://www.redhat.com/support/errata/RHSA-2011-1791.html","label":"www.redhat.com/support/errata/RHSA-2011-1791.html","hostname":"www.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00010.html","label":"lists.opensuse.org/opensuse-security-announce/2016-08/msg00010.html","hostname":"lists.opensuse.org","tags":["Vendor Advisory","X Refsource SUSE"]},{"url":"http://www.openwall.com/lists/oss-security/2011/10/31/5","label":"www.openwall.com/lists/oss-security/2011/10/31/5","hostname":"www.openwall.com","tags":["Mailing List","X Refsource MLIST"]},{"url":"http://www.securitytracker.com/id?1026265","label":"www.securitytracker.com/id?1026265","hostname":"www.securitytracker.com","tags":["VDB Entry","X Refsource SECTRACK"]},{"url":"http://www.openwall.com/lists/oss-security/2011/11/01/3","label":"www.openwall.com/lists/oss-security/2011/11/01/3","hostname":"www.openwall.com","tags":["Mailing List","X Refsource MLIST"]},{"url":"http://www.mandriva.com/security/advisories?name=MDVSA-2011:193","label":"www.mandriva.com/security/advisories?name=MDVSA-2011:193","hostname":"www.mandriva.com","tags":["Vendor Advisory","X Refsource MANDRIVA"]},{"url":"http://secunia.com/advisories/46609","label":"secunia.com/advisories/46609","hostname":"secunia.com","tags":["Third Party Advisory","X Refsource SECUNIA","Vendor Advisory"]},{"url":"http://www.squid-cache.org/Versions/v3/3.1/changesets/SQUID_3_1_16.html","label":"www.squid-cache.org/Versions/v3/3.1/changesets/SQUID_3_1_16.html","hostname":"www.squid-cache.org","tags":["X Refsource CONFIRM"]},{"url":"http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00040.html","label":"lists.opensuse.org/opensuse-security-announce/2016-08/msg00040.html","hostname":"lists.opensuse.org","tags":["Vendor Advisory","X Refsource SUSE"]},{"url":"http://secunia.com/advisories/47459","label":"secunia.com/advisories/47459","hostname":"secunia.com","tags":["Third Party Advisory","X Refsource SECUNIA"]},{"url":"https://access.redhat.com/errata/RHSA-2011:1791","label":"access.redhat.com/errata/RHSA-2011:1791","hostname":"access.redhat.com","tags":["Advisory"]},{"url":"https://access.redhat.com/security/updates/classification/#moderate","label":"access.redhat.com/security/updates/classification/","hostname":"access.redhat.com","tags":["ARTICLE"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=750316","label":"bugzilla.redhat.com/show_bug.cgi?id=750316","hostname":"bugzilla.redhat.com","tags":["REPORT"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2011/rhsa-2011_1791.json","label":"security.access.redhat.com/data/csaf/v2/advisories/2011/rhsa-2011_1791.json","hostname":"security.access.redhat.com","tags":["Advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2011-4096","label":"access.redhat.com/security/cve/CVE-2011-4096","hostname":"access.redhat.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2011-4096","label":"www.cve.org/CVERecord?id=CVE-2011-4096","hostname":"www.cve.org","tags":["Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2011-4096","label":"nvd.nist.gov/vuln/detail/CVE-2011-4096","hostname":"nvd.nist.gov","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":["SUSE-SU-2016:2089-1"],"duplicates":[],"related":["SUSE-SU-2016:2089-1"]},"timeline":[{"kind":"published","date":"2011-11-17T19:00:00.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2024-08-06T23:53:32.679Z","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":"2026-10-20T19:47:26.597Z","stale":false,"partial":false}}