{"id":"CVE-2021-20216","aliases":["ALPINE-CVE-2021-20216","DEBIAN-CVE-2021-20216","DLA-2548-1","EUVD-2021-7659","GHSA-3429-2hmm-5vvx","MGASA-2021-0089","UBUNTU-CVE-2021-20216","USN-4886-1","openSUSE-SU-2021:0265-1","openSUSE-SU-2021:0279-1","openSUSE-SU-2024:11193-1"],"status":"published","title":"A flaw was found in Privoxy in versions before 3.0.31. A memory leak that occurs when...","description":"A flaw was found in Privoxy in versions before 3.0.31. A memory leak that occurs when decompression fails unexpectedly may lead to a denial of service. The highest threat from this vulnerability is to system availability.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.02276,"percentile":0.83246,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-400","CWE-401"],"published":"2021-02-05T00:00:00Z","modified":"2026-10-23T18:04:48Z","fixes":[{"ecosystem":"Alpine:v3.12","package":"privoxy","fixed_in":["3.0.31-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.13","package":"privoxy","fixed_in":["3.0.31-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.14","package":"privoxy","fixed_in":["3.0.31-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.15","package":"privoxy","fixed_in":["3.0.31-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.16","package":"privoxy","fixed_in":["3.0.31-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.17","package":"privoxy","fixed_in":["3.0.31-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.18","package":"privoxy","fixed_in":["3.0.31-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.19","package":"privoxy","fixed_in":["3.0.31-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.20","package":"privoxy","fixed_in":["3.0.31-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.21","package":"privoxy","fixed_in":["3.0.31-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.22","package":"privoxy","fixed_in":["3.0.31-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.23","package":"privoxy","fixed_in":["3.0.31-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.24","package":"privoxy","fixed_in":["3.0.31-r0"],"sources":["osv"]},{"ecosystem":"Debian:12","package":"privoxy","fixed_in":["3.0.31-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"privoxy","fixed_in":["3.0.31-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"privoxy","fixed_in":["3.0.31-1"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:14.04:LTS","package":"privoxy","fixed_in":["3.0.21-7+deb8u1ubuntu0.1~esm1"],"sources":["osv"]},{"ecosystem":"Ubuntu:16.04:LTS","package":"privoxy","fixed_in":["3.0.24-1ubuntu0.1"],"sources":["osv"]},{"ecosystem":"Ubuntu:18.04:LTS","package":"privoxy","fixed_in":["3.0.26-5ubuntu0.1"],"sources":["osv"]},{"ecosystem":"Ubuntu:20.04:LTS","package":"privoxy","fixed_in":["3.0.28-2ubuntu0.1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Alpine:v3.12","package":"privoxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.31-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.13","package":"privoxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.31-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.14","package":"privoxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.31-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.15","package":"privoxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.31-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.16","package":"privoxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.31-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.17","package":"privoxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.31-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.18","package":"privoxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.31-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.19","package":"privoxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.31-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.20","package":"privoxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.31-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.21","package":"privoxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.31-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.22","package":"privoxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.31-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.23","package":"privoxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.31-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.24","package":"privoxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.31-r0"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"privoxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.31-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"privoxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.31-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"privoxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.31-1"}]}]},{"source":"osv","ecosystem":"Debian:9","package":"privoxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.26-3+deb9u1"}]}],"versions":["3.0.26-3"],"bundled":9},{"source":"osv","ecosystem":"Mageia:7","package":"privoxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.31-1.mga7"}]}],"bundled":2},{"source":"osv","ecosystem":"Ubuntu:Pro:14.04:LTS","package":"privoxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.21-7+deb8u1ubuntu0.1~esm1"}]}],"versions":["3.0.21-1","3.0.21-2","3.0.21-7+deb8u1build0.14.04.1"]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"privoxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.24-1ubuntu0.1"}]}],"versions":["3.0.23-3","3.0.23-4","3.0.23-5","3.0.24-1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"privoxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.26-5ubuntu0.1"}]}],"versions":["3.0.26-3","3.0.26-4","3.0.26-5"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"privoxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.28-2ubuntu0.1"}]}],"versions":["3.0.28-2"]},{"source":"osv","ecosystem":"Ubuntu:Pro:14.04:LTS","package":"privoxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.21-7+deb8u1ubuntu0.1~esm1"}]}],"versions":["3.0.21-1","3.0.21-2","3.0.21-7+deb8u1build0.14.04.1"],"bundled":14},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"privoxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.24-1ubuntu0.1"}]}],"versions":["3.0.23-3","3.0.23-4","3.0.23-5","3.0.24-1"],"bundled":14},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"privoxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.26-5ubuntu0.1"}]}],"versions":["3.0.26-3","3.0.26-4","3.0.26-5"],"bundled":14},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"privoxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.28-2ubuntu0.1"}]}],"versions":["3.0.28-2"],"bundled":14},{"source":"osv","ecosystem":"openSUSE:Leap 15.2","package":"privoxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.31-lp152.3.6.1"}]}],"bundled":2},{"source":"osv","ecosystem":"SUSE:Package Hub 15 SP2","package":"privoxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.31-bp152.4.6.1"}]}],"bundled":2},{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"privoxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.32-2.3"}]}],"bundled":7}],"products":[{"vendor":"privoxy","product":"privoxy"}],"references":[{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1923256","tags":["x_refsource_MISC","x_transferred","Issue Tracking","Third Party Advisory","report"]},{"url":"https://www.openwall.com/lists/oss-security/2021/01/31/2","tags":["x_refsource_MISC","x_transferred","Mailing List","Release Notes","Third Party Advisory","advisory","report"]},{"url":"https://www.privoxy.org/3.0.31/user-manual/whatsnew.html","tags":["x_refsource_MISC","x_transferred","Release Notes","Vendor Advisory","advisory"]},{"url":"https://security.gentoo.org/glsa/202107-16","tags":["vendor-advisory","x_refsource_GENTOO","x_transferred","Third Party Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-20216"},{"url":"https://github.com/advisories/GHSA-3429-2hmm-5vvx"},{"url":"https://security.alpinelinux.org/vuln/CVE-2021-20216","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2021-20216","tags":["advisory"]},{"url":"https://advisories.mageia.org/MGASA-2021-0089.html","tags":["advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=28281","tags":["report"]},{"url":"http://www.privoxy.org/announce.txt","tags":["web"]},{"url":"https://www.openwall.com/lists/oss-security/2021/02/04/4","tags":["web"]},{"url":"https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/LYXYETZZHYGLBE3WLXSZCYBO5VDRKFDT/","tags":["web","advisory"]},{"url":"https://ubuntu.com/security/CVE-2021-20216","tags":["report"]},{"url":"https://www.privoxy.org/gitweb/?p=privoxy.git;a=commit;h=f431d61740cc03c1c5f6b7f9c7a4a8d0bedd70dd","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-4886-1","tags":["advisory"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-20216","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2020-35502","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-20209","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-20210","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-20211","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-20212","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-20213","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-20214","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-20215","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-20217","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-20272","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-20273","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-20275","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-20276","tags":["report"]},{"url":"https://bugzilla.suse.com/1181650","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2021-20216","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-20217","tags":["web"]},{"url":"https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/OB5C3CKHSROKXDMILX7JOD3PKW2CMF6X/","tags":["advisory"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2021-20272","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-20273","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-20274","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-20275","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-20276","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2021-20216","description":"A flaw was found in Privoxy in versions before 3.0.31. A memory leak that occurs when decompression fails unexpectedly may lead to a denial of service. The highest threat from this vulnerability is to system availability.","status":"published","published":"2021-03-25T18:57:49Z","modified":"2024-08-03T17:30:07.787Z","cwes":["CWE-400"],"updated_at":"2026-11-02T14:32:55.19484Z"}],"euvd":[{"id":"EUVD-2021-7659","description":"A flaw was found in Privoxy in versions before 3.0.31. A memory leak that occurs when decompression fails unexpectedly may lead to a denial of service. The highest threat from this vulnerability is to system availability.","status":"published","published":"2021-03-25T18:57:49Z","modified":"2024-08-03T17:30:07Z","updated_at":"2026-11-03T03:25:09.355483Z"}],"ghsa":[{"id":"GHSA-3429-2hmm-5vvx","title":"A flaw was found in Privoxy in versions before 3.0.31. A memory leak that occurs when...","description":"A flaw was found in Privoxy in versions before 3.0.31. A memory leak that occurs when decompression fails unexpectedly may lead to a denial of service. The highest threat from this vulnerability is to system availability.","status":"published","published":"2022-05-24T17:45:22Z","modified":"2023-01-27T05:03:53Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-400","CWE-401"],"updated_at":"2026-11-02T14:42:20.442744Z"}],"nvd":[{"id":"CVE-2021-20216","description":"A flaw was found in Privoxy in versions before 3.0.31. A memory leak that occurs when decompression fails unexpectedly may lead to a denial of service. The highest threat from this vulnerability is to system availability.","status":"published","published":"2021-03-25T19:15:13.283Z","modified":"2026-06-17T03:33:29.26Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":7.8,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:C","level":"high","assessor":"primary"}],"cwes":["CWE-400","CWE-401"],"updated_at":"2026-11-02T14:06:51.197859Z"}],"osv":[{"id":"ALPINE-CVE-2021-20216","description":"A flaw was found in Privoxy in versions before 3.0.31. A memory leak that occurs when decompression fails unexpectedly may lead to a denial of service. The highest threat from this vulnerability is to system availability.","status":"published","published":"2021-03-25T19:15:13.283Z","modified":"2026-10-23T17:17:56.140092797Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:27:48.646074Z"},{"id":"CVE-2021-20216","description":"A flaw was found in Privoxy in versions before 3.0.31. A memory leak that occurs when decompression fails unexpectedly may lead to a denial of service. The highest threat from this vulnerability is to system availability.","status":"published","published":"2021-03-25T19:15:13.283Z","modified":"2026-04-16T04:37:58.764254196Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:17.663289Z"},{"id":"DEBIAN-CVE-2021-20216","description":"A flaw was found in Privoxy in versions before 3.0.31. A memory leak that occurs when decompression fails unexpectedly may lead to a denial of service. The highest threat from this vulnerability is to system availability.","status":"published","published":"2021-03-25T19:15:13.283Z","modified":"2026-10-23T18:04:48.84897858Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:34.311861Z"},{"id":"UBUNTU-CVE-2021-20216","description":"A flaw was found in Privoxy in versions before 3.0.31. A memory leak that occurs when decompression fails unexpectedly may lead to a denial of service. The highest threat from this vulnerability is to system availability.","status":"published","published":"2021-02-05T00:00:00Z","modified":"2026-02-04T04:29:12.464493Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:54:25.728622Z"},{"id":"DLA-2548-1","title":"privoxy - security update","status":"published","published":"2021-02-07T00:00:00Z","modified":"2026-03-09T01:22:50.520273Z","updated_at":"2026-11-02T15:46:10.712745Z"},{"id":"MGASA-2021-0089","title":"Updated privoxy package fixes security vulnerabilities","description":"Fixed a memory leak when decompression fails \"unexpectedly\". (CVE-2021-20216)\nPrevent an assertion from getting triggered by a crafted CGI request.\n(CVE-2021-20217)\n","status":"published","published":"2021-02-19T10:27:54Z","modified":"2026-04-16T04:43:55.043519248Z","updated_at":"2026-11-02T15:49:41.509337Z"},{"id":"openSUSE-SU-2021:0265-1","title":"Security update for privoxy","description":"This update for privoxy fixes the following issues:\n\n- Update to version 3.0.31:\n  - Security/Reliability (boo#1181650)\n    - Prevent an assertion from getting triggered by a crafted\n      CGI request.\n      Commit 5bba5b89193fa. OVE-20210130-0001. CVE-2021-20217\n      Reported by: Joshua Rogers (Opera)\n    - Fixed a memory leak when decompression fails 'unexpectedly'.\n      Commit f431d61740cc0. OVE-20210128-0001. CVE-2021-20216\n  - Bug fixes:\n    - Fixed detection of insufficient data for decompression.\n      Previously Privoxy could try to decompress a partly\n      uninitialized buffer.\n","status":"published","published":"2021-02-08T17:05:07Z","modified":"2026-02-04T03:28:57.648755Z","updated_at":"2026-11-02T16:58:31.879684Z"},{"id":"openSUSE-SU-2021:0279-1","title":"Security update for privoxy","description":"This update for privoxy fixes the following issues:\n\n- Update to version 3.0.31:\n  - Security/Reliability (boo#1181650)\n    - Prevent an assertion from getting triggered by a crafted\n      CGI request.\n      Commit 5bba5b89193fa. OVE-20210130-0001. CVE-2021-20217\n      Reported by: Joshua Rogers (Opera)\n    - Fixed a memory leak when decompression fails 'unexpectedly'.\n      Commit f431d61740cc0. OVE-20210128-0001. CVE-2021-20216\n  - Bug fixes:\n    - Fixed detection of insufficient data for decompression.\n      Previously Privoxy could try to decompress a partly\n      uninitialized buffer.\n\nThis update was imported from the openSUSE:Leap:15.2:Update update project.","status":"published","published":"2021-02-12T05:06:04Z","modified":"2026-02-04T03:44:56.104037Z","updated_at":"2026-11-02T16:58:31.879684Z"},{"id":"openSUSE-SU-2024:11193-1","title":"privoxy-3.0.32-2.3 on GA media","description":"These are all security issues fixed in the privoxy-3.0.32-2.3 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2024-06-15T00:00:00Z","modified":"2026-02-04T03:17:37.693835Z","updated_at":"2026-11-02T16:58:34.894275Z"},{"id":"USN-4886-1","title":"privoxy vulnerabilities","description":"It was discovered that Privoxy incorrectly handled CGI requests. An attacker\ncould possibly use this issue to cause a denial of service or obtain sensitive\ninformation. (CVE-2020-35502, CVE-2021-20209, CVE-2021-20210,\nCVE-2021-20213, CVE-2021-20215, CVE-2021-20216, CVE-2021-20217,\nCVE-2021-20272, CVE-2021-20273, CVE-2021-20275)\n\nIt was discovered that Privoxy incorrectly handled certain regular\nexpressions. An attacker could possibly use this issue to cause a denial of\nservice or obtain sensitive information. (CVE-2021-20212, CVE-2021-20276)\n\nIt was discovered that Privoxy incorrectly handled client tags. An attacker\ncould possibly use this issue to cause Privoxy to consume resources, resulting\nin a denial of service. This issue only affected Ubuntu 18.04 LTS,\nUbuntu 20.04 LTS and Ubuntu 20.10. (CVE-2021-20211)\n\nIt was discovered that Privoxy incorrectly handled client tags. An attacker\ncould possibly use this issue to cause Privoxy to consume resources, resulting\nin a denial of service. This issue only affected Ubuntu 20.04 LTS and\nUbuntu 20.10. (CVE-2021-20214)\n","status":"published","published":"2021-03-22T16:55:19Z","modified":"2026-06-29T13:48:17.434738418Z","updated_at":"2026-11-02T16:58:15.159055Z"}]}}