{"id":"CVE-2011-4096","aliases":["DEBIAN-CVE-2011-4096","DSA-2381-1","EUVD-2011-4047","GHSA-g3fq-pgcr-r7w6","RHSA-2011:1791","SUSE-SU-2016:2089-1"],"status":"published","title":"The idnsGrokReply function in Squid before 3.1.16 does not properly free memory, which allows...","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.","severity":{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.37186,"percentile":0.9853,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-399"],"published":"2011-11-17T19:00:00Z","modified":"2026-06-26T10:17:20Z","fixes":[{"ecosystem":"Debian:6.0","package":"squid3","fixed_in":["3.1.6-1.2+squeeze2"],"sources":["osv"]},{"ecosystem":"Red Hat:enterprise_linux:6::server","package":"squid","fixed_in":["7:3.1.10-1.el6_2.1"],"sources":["osv"]},{"ecosystem":"Red Hat:enterprise_linux:6::server","package":"squid-debuginfo","fixed_in":["7:3.1.10-1.el6_2.1"],"sources":["osv"]},{"ecosystem":"Red Hat:enterprise_linux:6::workstation","package":"squid","fixed_in":["7:3.1.10-1.el6_2.1"],"sources":["osv"]},{"ecosystem":"Red Hat:enterprise_linux:6::workstation","package":"squid-debuginfo","fixed_in":["7:3.1.10-1.el6_2.1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:6.0","package":"squid3","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.1.6-1.2+squeeze2"}]}],"versions":["3.1.6-1.2","3.1.6-1.2+squeeze1"]},{"source":"osv","ecosystem":"Red Hat:enterprise_linux:6::server","package":"squid","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7:3.1.10-1.el6_2.1"}]}]},{"source":"osv","ecosystem":"Red Hat:enterprise_linux:6::server","package":"squid-debuginfo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7:3.1.10-1.el6_2.1"}]}]},{"source":"osv","ecosystem":"Red Hat:enterprise_linux:6::workstation","package":"squid","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7:3.1.10-1.el6_2.1"}]}]},{"source":"osv","ecosystem":"Red Hat:enterprise_linux:6::workstation","package":"squid-debuginfo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7:3.1.10-1.el6_2.1"}]}]},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Server 11 SP4","package":"squid3","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.1.23-8.16.30.1"}]}],"bundled":25},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Server for SAP Applications 11 SP4","package":"squid3","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.1.23-8.16.30.1"}]}],"bundled":25}],"products":[{"vendor":"squid-cache","product":"squid"}],"references":[{"url":"http://bugs.squid-cache.org/show_bug.cgi?id=3237#c12","tags":["x_refsource_MISC","x_transferred"]},{"url":"http://www.redhat.com/support/errata/RHSA-2011-1791.html","tags":["vendor-advisory","x_refsource_REDHAT","x_transferred"]},{"url":"http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00010.html","tags":["vendor-advisory","x_refsource_SUSE","x_transferred"]},{"url":"http://www.openwall.com/lists/oss-security/2011/10/31/5","tags":["mailing-list","x_refsource_MLIST","x_transferred"]},{"url":"http://www.securitytracker.com/id?1026265","tags":["vdb-entry","x_refsource_SECTRACK","x_transferred"]},{"url":"http://www.openwall.com/lists/oss-security/2011/11/01/3","tags":["mailing-list","x_refsource_MLIST","x_transferred"]},{"url":"http://www.mandriva.com/security/advisories?name=MDVSA-2011:193","tags":["vendor-advisory","x_refsource_MANDRIVA","x_transferred"]},{"url":"http://secunia.com/advisories/46609","tags":["third-party-advisory","x_refsource_SECUNIA","x_transferred","Vendor Advisory"]},{"url":"http://www.squid-cache.org/Versions/v3/3.1/changesets/SQUID_3_1_16.html","tags":["x_refsource_CONFIRM","x_transferred"]},{"url":"http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00040.html","tags":["vendor-advisory","x_refsource_SUSE","x_transferred"]},{"url":"http://secunia.com/advisories/47459","tags":["third-party-advisory","x_refsource_SECUNIA","x_transferred"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2011-4096","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-g3fq-pgcr-r7w6"},{"url":"https://access.redhat.com/errata/RHSA-2011:1791","tags":["advisory"]},{"url":"https://access.redhat.com/security/updates/classification/#moderate","tags":["article"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=750316","tags":["report"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2011/rhsa-2011_1791.json","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2011-4096","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2011-4096","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2016/suse-su-20162089-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/895773","tags":["report"]},{"url":"https://bugzilla.suse.com/902197","tags":["report"]},{"url":"https://bugzilla.suse.com/938715","tags":["report"]},{"url":"https://bugzilla.suse.com/963539","tags":["report"]},{"url":"https://bugzilla.suse.com/967011","tags":["report"]},{"url":"https://bugzilla.suse.com/968392","tags":["report"]},{"url":"https://bugzilla.suse.com/968393","tags":["report"]},{"url":"https://bugzilla.suse.com/968394","tags":["report"]},{"url":"https://bugzilla.suse.com/968395","tags":["report"]},{"url":"https://bugzilla.suse.com/973782","tags":["report"]},{"url":"https://bugzilla.suse.com/973783","tags":["report"]},{"url":"https://bugzilla.suse.com/976553","tags":["report"]},{"url":"https://bugzilla.suse.com/976556","tags":["report"]},{"url":"https://bugzilla.suse.com/976708","tags":["report"]},{"url":"https://bugzilla.suse.com/979008","tags":["report"]},{"url":"https://bugzilla.suse.com/979009","tags":["report"]},{"url":"https://bugzilla.suse.com/979010","tags":["report"]},{"url":"https://bugzilla.suse.com/979011","tags":["report"]},{"url":"https://bugzilla.suse.com/993299","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2011-3205","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2011-4096","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2012-5643","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2013-0188","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2013-4115","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2014-0128","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2014-6270","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2014-7141","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2014-7142","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-5400","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-2390","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-2569","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-2570","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-2571","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-2572","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-3947","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-3948","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-4051","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-4052","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-4053","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-4054","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-4553","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-4554","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-4555","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-4556","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2011-4096","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.","status":"published","published":"2011-11-17T19:00:00Z","modified":"2024-08-06T23:53:32.679Z","updated_at":"2026-11-02T14:35:37.989579Z"}],"euvd":[{"id":"EUVD-2011-4047","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.","status":"published","published":"2011-11-17T19:00:00Z","modified":"2024-08-06T23:53:32Z","updated_at":"2026-11-03T01:39:49.868954Z"}],"ghsa":[{"id":"GHSA-g3fq-pgcr-r7w6","title":"The idnsGrokReply function in Squid before 3.1.16 does not properly free memory, which allows...","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.","status":"published","published":"2022-05-17T03:46:33Z","modified":"2023-01-27T05:08:37Z","updated_at":"2026-11-02T14:43:19.500885Z"}],"nvd":[{"id":"CVE-2011-4096","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.","status":"published","published":"2011-11-17T19:55:01.453Z","modified":"2026-06-16T23:34:25.017Z","cvss":[{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-399"],"updated_at":"2026-11-02T14:02:10.769216Z"}],"osv":[{"id":"DSA-2381-1","title":"squid3 - invalid memory deallocation","status":"published","published":"2012-01-06T00:00:00Z","modified":"2026-03-09T01:20:02.904261Z","updated_at":"2026-11-02T15:46:15.489951Z"},{"id":"RHSA-2011:1791","title":"Red Hat Security Advisory: squid security update","status":"published","published":"2024-09-15T19:34:54Z","modified":"2026-06-26T10:17:20Z","updated_at":"2026-11-02T15:53:01.495018Z"},{"id":"SUSE-SU-2016:2089-1","title":"Security update for squid3","description":"\n\nThis update for squid3 fixes the following issues:\n\n- Multiple issues in pinger ICMP processing.  (CVE-2014-7141, CVE-2014-7142) \n\n- CVE-2016-3947: Buffer overrun issue in pinger\n    ICMPv6 processing. (bsc#973782)\n\n-  CVE-2016-4554: fix header smuggling issue in HTTP Request processing (bsc#979010)\n\n- Fix multiple Denial of Service issues in HTTP Response processing.\n    (CVE-2016-2569, CVE-2016-2570, CVE-2016-2571, CVE-2016-2572,\n     bsc#968392, bsc#968393, bsc#968394, bsc#968395)\n- Regression caused by the DoS fixes above (bsc#993299)\n\n- CVE-2016-3948: Fix denial of service in HTTP Response processing (bsc#973783)\n\n- CVE-2016-4051: fixes buffer overflow in cachemgr.cgi (bsc#976553)\n\n- CVE-2016-4052, CVE-2016-4053, CVE-2016-4054:\n  * fixes multiple issues in ESI processing (bsc#976556)\n\n- CVE-2016-4556: fixes double free vulnerability in Esi.cc (bsc#979008)\n\n- CVE-2015-5400: Improper Protection of Alternate Path (bsc#938715)\n\n- CVE-2014-6270: fix off-by-one in snmp subsystem (bsc#895773)\n\n- Memory leak in squid3 when using external_acl (bsc#976708)\n","status":"published","published":"2016-08-16T12:56:03Z","modified":"2026-02-04T03:13:42.545823Z","updated_at":"2026-11-02T15:53:43.438985Z"}]}}