{"id":"CVE-2016-3948","aliases":["DEBIAN-CVE-2016-3948","DSA-3625-1","EUVD-2016-4960","GHSA-f5f6-9f53-wf3r","MGASA-2016-0133","RHSA-2016:2600","SUSE-SU-2016:2008-1","SUSE-SU-2016:2089-1","UBUNTU-CVE-2016-3948","USN-3557-1"],"status":"published","title":"Squid 3.x before 3.5.16 and 4.x before 4.0.8 improperly perform bounds checking, which allows...","description":"Squid 3.x before 3.5.16 and 4.x before 4.0.8 improperly perform bounds checking, which allows remote attackers to cause a denial of service via a crafted HTTP response, related to Vary 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Advisory","advisory","web","article","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2016-3948","tags":["advisory"]},{"url":"https://usn.ubuntu.com/3557-1"},{"url":"https://github.com/advisories/GHSA-f5f6-9f53-wf3r"},{"url":"https://security-tracker.debian.org/tracker/CVE-2016-3948","tags":["advisory"]},{"url":"https://advisories.mageia.org/MGASA-2016-0133.html","tags":["advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=18122","tags":["report"]},{"url":"http://www.squid-cache.org/Advisories/SQUID-2016_3.txt","tags":["web"]},{"url":"https://access.redhat.com/errata/RHSA-2016:2600","tags":["advisory"]},{"url":"https://access.redhat.com/security/updates/classification/#moderate","tags":["article"]},{"url":"https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/7.3_Release_Notes/index.html","tags":["article"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1254016","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1254018","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1299972","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1312257","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1312262","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1323594","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1330186","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1336940","tags":["report"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2016/rhsa-2016_2600.json","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2016-2569","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2016-2569","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2016-2569","tags":["advisory"]},{"url":"http://www.squid-cache.org/Advisories/SQUID-2016_2.txt","tags":["article"]},{"url":"https://access.redhat.com/security/cve/CVE-2016-2570","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2016-2570","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2016-2570","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2016-2571","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2016-2571","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2016-2571","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2016-2572","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2016-2572","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2016-2572","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2016-3948","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2016-3948","tags":["advisory","report"]},{"url":"https://www.suse.com/support/update/announcement/2016/suse-su-20162008-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/902197","tags":["report"]},{"url":"https://bugzilla.suse.com/929493","tags":["report"]},{"url":"https://bugzilla.suse.com/938715","tags":["report"]},{"url":"https://bugzilla.suse.com/955783","tags":["report"]},{"url":"https://bugzilla.suse.com/959290","tags":["report"]},{"url":"https://bugzilla.suse.com/963539","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/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://www.suse.com/security/cve/CVE-2015-3455","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-5400","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"]},{"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/967011","tags":["report"]},{"url":"https://bugzilla.suse.com/976708","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-2016-2390","tags":["web"]},{"url":"https://ubuntu.com/security/CVE-2016-3948","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-3557-1","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2016-2569","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2016-2570","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2016-2571","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2018-1000024","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2018-1000027","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2016-3948","description":"Squid 3.x before 3.5.16 and 4.x before 4.0.8 improperly perform bounds checking, which allows remote attackers to cause a denial of service via a crafted HTTP response, related to Vary headers.","status":"published","published":"2016-04-07T18:00:00Z","modified":"2024-08-06T00:10:31.913Z","updated_at":"2026-11-02T14:33:34.094161Z"}],"euvd":[{"id":"EUVD-2016-4960","description":"Squid 3.x before 3.5.16 and 4.x before 4.0.8 improperly perform bounds checking, which allows remote attackers to cause a denial of service via a crafted HTTP response, related to Vary headers.","status":"published","published":"2016-04-07T18:00:00Z","modified":"2024-08-06T00:10:31Z","updated_at":"2026-11-03T02:22:48.690835Z"}],"ghsa":[{"id":"GHSA-f5f6-9f53-wf3r","title":"Squid 3.x before 3.5.16 and 4.x before 4.0.8 improperly perform bounds checking, which allows...","description":"Squid 3.x before 3.5.16 and 4.x before 4.0.8 improperly perform bounds checking, which allows remote attackers to cause a denial of service via a crafted HTTP response, related to Vary headers.","status":"published","published":"2022-05-14T03:38:02Z","modified":"2025-04-12T12:58:08Z","cvss":[{"version":"3.0","score":7.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-119"],"updated_at":"2026-11-02T15:01:26.389958Z"}],"nvd":[{"id":"CVE-2016-3948","description":"Squid 3.x before 3.5.16 and 4.x before 4.0.8 improperly perform bounds checking, which allows remote attackers to cause a denial of service via a crafted HTTP response, related to Vary headers.","status":"published","published":"2016-04-07T18:59:01.607Z","modified":"2026-06-17T00:46:37.087Z","cvss":[{"version":"3.0","score":7.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-119"],"updated_at":"2026-11-02T14:03:22.479119Z"}],"osv":[{"id":"CVE-2016-3948","description":"Squid 3.x before 3.5.16 and 4.x before 4.0.8 improperly perform bounds checking, which allows remote attackers to cause a denial of service via a crafted HTTP response, related to Vary headers.","status":"published","published":"2016-04-07T18:59:01.607Z","modified":"2026-10-24T10:30:54.484798028Z","cvss":[{"version":"3.0","score":7.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:02.454775Z"},{"id":"DEBIAN-CVE-2016-3948","description":"Squid 3.x before 3.5.16 and 4.x before 4.0.8 improperly perform bounds checking, which allows remote attackers to cause a denial of service via a crafted HTTP response, related to Vary headers.","status":"published","published":"2016-04-07T18:59:01.607Z","modified":"2026-09-22T07:01:59.211786696Z","cvss":[{"version":"3.0","score":7.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:27.627285Z"},{"id":"UBUNTU-CVE-2016-3948","description":"Squid 3.x before 3.5.16 and 4.x before 4.0.8 improperly perform bounds checking, which allows remote attackers to cause a denial of service via a crafted HTTP response, related to Vary headers.","status":"published","published":"2016-04-07T00:00:00Z","modified":"2026-02-04T02:18:55.952632Z","cvss":[{"version":"3.0","score":7.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:54:12.261906Z"},{"id":"DSA-3625-1","title":"squid3 - security update","status":"published","published":"2016-07-22T00:00:00Z","modified":"2026-03-09T01:19:08.514082Z","updated_at":"2026-11-02T15:46:16.199525Z"},{"id":"MGASA-2016-0133","title":"Updated squid packages fix security vulnerabilities","description":"Updated squid packages fix security vulnerabilities:\n\nDue to a buffer overrun, the Squid pinger binary in Squid before 3.5.16 is\nvulnerable to a denial of service or information leak attack when processing\nICMPv6 packets. This bug also permits the server response to manipulate other\nICMP and ICMPv6 queries processing to cause information leaks (CVE-2016-3947).\n\nDue to incorrect bounds checking, Squid before 3.5.16 is vulnerable to a\ndenial of service attack when processing HTTP responses (CVE-2016-3948).\n","status":"published","published":"2016-04-06T14:09:53Z","modified":"2026-04-16T06:24:29.46316447Z","updated_at":"2026-11-02T15:49:39.792687Z"},{"id":"RHSA-2016:2600","title":"Red Hat Security Advisory: squid security, bug fix, and enhancement update","status":"published","published":"2024-09-15T23:32:04Z","modified":"2026-06-26T12:21:52.388775436Z","updated_at":"2026-11-02T15:53:03.734507Z"},{"id":"SUSE-SU-2016:2008-1","title":"Security update for squid","description":"\nThe Squid HTTP proxy has been updated to version 3.3.14, fixing the following\nsecurity issues:\n\n- Fixed 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- CVE-2016-3947: Buffer overrun issue in pinger ICMPv6\n  processing. (bsc#973782)\n- CVE-2015-5400: Improper protection of alternate path. (bsc#938715)\n- CVE-2015-3455: Squid http proxy configured with client-first SSL\n  bumping did not correctly validate server certificate. (bsc#929493)\n- CVE-2016-3948: Fixed denial of service in HTTP Response processing\n  (bsc#973783)\n- CVE-2016-4051: fixes buffer overflow in cachemgr.cgi (bsc#976553)\n- CVE-2016-4052, CVE-2016-4053, CVE-2016-4054: Fixed multiple issues in\n  ESI processing (bsc#976556)\n- CVE-2016-4553: Fixed cache poisoning issue in HTTP Request handling (bsc#979009)\n- CVE-2016-4554: Fixed header smuggling issue in HTTP Request processing\n  (bsc#979010)\n- Fixed multiple Denial of Service issues in ESI Response processing.\n  (CVE-2016-4555, CVE-2016-4556, bsc#979011, bsc#979008)\n\nAdditionally, the following non-security issues have been fixed:\n\n- Fix header size in script unsquid.pl. (bsc#902197)\n- Add external helper ext_session_acl to package. (bsc#959290)\n- Update forward_max_tries to permit 25 server paths\n  With cloud sites becoming more popular more CDN servers are producing\n  long lists of IPv6 and IPv4 addresses. If there are not enough paths\n  selected the IPv4 ones may never be reached.\n- squid.init: wait that squid really dies when we kill it on upgrade instead\n  of proclaiming its demise prematurely (bnc#963539)\n","status":"published","published":"2016-08-09T11:32:29Z","modified":"2026-02-04T04:20:47.153034Z","updated_at":"2026-11-02T15:53:43.438985Z"},{"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"},{"id":"USN-3557-1","title":"squid3 vulnerabilities","description":"Mathias Fischer discovered that Squid incorrectly handled certain long\nstrings in headers. A malicious remote server could possibly cause Squid to\ncrash, resulting in a denial of service. This issue was only addressed in\nUbuntu 16.04 LTS. (CVE-2016-2569)\n\nWilliam Lima discovered that Squid incorrectly handled XML parsing when\nprocessing Edge Side Includes (ESI). A malicious remote server could\npossibly cause Squid to crash, resulting in a denial of service. This issue\nwas only addressed in Ubuntu 16.04 LTS. (CVE-2016-2570)\n\nAlex Rousskov discovered that Squid incorrectly handled response-parsing\nfailures. A malicious remote server could possibly cause Squid to crash,\nresulting in a denial of service. This issue only applied to Ubuntu 16.04\nLTS. (CVE-2016-2571)\n\nSantiago Ruano Rincón discovered that Squid incorrectly handled certain\nVary headers. A remote attacker could possibly use this issue to cause\nSquid to crash, resulting in a denial of service. This issue was only\naddressed in Ubuntu 16.04 LTS. (CVE-2016-3948)\n\nLouis Dion-Marcil discovered that Squid incorrectly handled certain Edge\nSide Includes (ESI) responses. A malicious remote server could possibly\ncause Squid to crash, resulting in a denial of service. (CVE-2018-1000024)\n\nLouis Dion-Marcil discovered that Squid incorrectly handled certain Edge\nSide Includes (ESI) responses. A malicious remote server could possibly\ncause Squid to crash, resulting in a denial of service. (CVE-2018-1000027)\n","status":"published","published":"2018-02-05T18:09:07Z","modified":"2026-02-10T04:41:16Z","updated_at":"2026-11-02T16:58:13.496563Z"}]}}