{"id":"CVE-2020-35502","aliases":["DEBIAN-CVE-2020-35502","DLA-2548-1","EUVD-2020-23171","GHSA-fqmf-fv5c-gpv2","UBUNTU-CVE-2020-35502","USN-4886-1"],"status":"published","title":"A flaw was found in Privoxy in versions before 3.0.29. Memory leaks when a response is buffered...","description":"A flaw was found in Privoxy in versions before 3.0.29. Memory leaks when a response is buffered and the buffer limit is reached or Privoxy is running out of memory can lead to a system crash.","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":0.02355,"percentile":0.83873,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-401"],"published":"2020-12-31T00:00:00Z","modified":"2026-10-26T12:00:53Z","fixes":[{"ecosystem":"Debian:12","package":"privoxy","fixed_in":["3.0.29-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"privoxy","fixed_in":["3.0.29-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"privoxy","fixed_in":["3.0.29-1"],"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":"Debian:12","package":"privoxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.29-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"privoxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.29-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"privoxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.29-1"}]}]},{"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":"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}],"products":[{"vendor":"privoxy","product":"privoxy"}],"references":[{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1928749","tags":["x_refsource_MISC","x_transferred","Issue Tracking","Third Party Advisory","report"]},{"url":"https://www.privoxy.org/3.0.29/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-2020-35502"},{"url":"https://github.com/advisories/GHSA-fqmf-fv5c-gpv2"},{"url":"https://security-tracker.debian.org/tracker/CVE-2020-35502","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2020-35502","tags":["report"]},{"url":"https://www.openwall.com/lists/oss-security/2021/02/03/3","tags":["report"]},{"url":"https://www.privoxy.org/gitweb/?p=privoxy.git;a=commit;h=bbd53f1010b","tags":["report"]},{"url":"https://www.privoxy.org/gitweb/?p=privoxy.git;a=commit;h=4490d451f9b","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-4886-1","tags":["advisory"]},{"url":"https://www.cve.org/CVERecord?id=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-2021-20216","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"]}],"sources":{"cve":[{"id":"CVE-2020-35502","description":"A flaw was found in Privoxy in versions before 3.0.29. Memory leaks when a response is buffered and the buffer limit is reached or Privoxy is running out of memory can lead to a system crash.","status":"published","published":"2021-03-25T18:56:55Z","modified":"2024-08-04T17:02:08.124Z","cwes":["CWE-401"],"updated_at":"2026-11-02T14:35:57.975444Z"}],"euvd":[{"id":"EUVD-2020-23171","description":"A flaw was found in Privoxy in versions before 3.0.29. Memory leaks when a response is buffered and the buffer limit is reached or Privoxy is running out of memory can lead to a system crash.","status":"published","published":"2021-03-25T18:56:55Z","modified":"2024-08-04T17:02:08Z","updated_at":"2026-11-03T03:07:06.389211Z"}],"ghsa":[{"id":"GHSA-fqmf-fv5c-gpv2","title":"A flaw was found in Privoxy in versions before 3.0.29. Memory leaks when a response is buffered...","description":"A flaw was found in Privoxy in versions before 3.0.29. Memory leaks when a response is buffered and the buffer limit is reached or Privoxy is running out of memory can lead to a system crash.","status":"published","published":"2022-05-24T17:45:20Z","modified":"2023-01-29T05:06:09Z","cwes":["CWE-401"],"updated_at":"2026-11-02T14:45:57.703827Z"}],"nvd":[{"id":"CVE-2020-35502","description":"A flaw was found in Privoxy in versions before 3.0.29. Memory leaks when a response is buffered and the buffer limit is reached or Privoxy is running out of memory can lead to a system crash.","status":"published","published":"2021-03-25T19:15:12.61Z","modified":"2026-06-17T03:13:49.363Z","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-401"],"updated_at":"2026-11-02T14:06:37.687844Z"}],"osv":[{"id":"CVE-2020-35502","description":"A flaw was found in Privoxy in versions before 3.0.29. Memory leaks when a response is buffered and the buffer limit is reached or Privoxy is running out of memory can lead to a system crash.","status":"published","published":"2021-03-25T19:15:12.61Z","modified":"2026-03-14T10:25:50.378721Z","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":"2026-11-02T15:44:16.612899Z"},{"id":"DEBIAN-CVE-2020-35502","description":"A flaw was found in Privoxy in versions before 3.0.29. Memory leaks when a response is buffered and the buffer limit is reached or Privoxy is running out of memory can lead to a system crash.","status":"published","published":"2021-03-25T19:15:12.61Z","modified":"2026-10-26T12:00:53.552864152Z","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":"2026-11-02T15:45:34.019707Z"},{"id":"UBUNTU-CVE-2020-35502","description":"A flaw was found in Privoxy in versions before 3.0.29. Memory leaks when a response is buffered and the buffer limit is reached or Privoxy is running out of memory can lead to a system crash.","status":"published","published":"2020-12-31T00:00:00Z","modified":"2026-02-04T03:38:16.762415Z","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":"2026-11-02T15:54:24.541803Z"},{"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":"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"}]}}