{"schemaVersion":3,"id":"USN-4886-1","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"privoxy vulnerabilities\n\nIt 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)","dates":{"published":"2021-03-22T16:55:19.000Z","modified":"2026-06-29T13:48:17.434Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":null,"severity":"unknown","version":null,"versionLabel":null,"source":null,"vector":null,"computed":false,"selection":"none"},"metrics":[]},"epss":{"probability":null,"percentile":null,"severity":"unknown","asOf":null,"change":{"pp":null,"baselineDate":null,"baselineScore":null},"history":[],"last30":[]},"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":[],"affected":[{"vendor":"ubuntu","product":"privoxy","name":"privoxy","label":"privoxy","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/privoxy","purlType":"deb","versions":[{"text":"< 3.0.21-7+deb8u1ubuntu0.1~esm1","noFixRecorded":false,"fixedIn":null},{"text":"< 3.0.24-1ubuntu0.1","noFixRecorded":false,"fixedIn":null},{"text":"< 3.0.26-5ubuntu0.1","noFixRecorded":false,"fixedIn":null},{"text":"< 3.0.28-2ubuntu0.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 3.0.21-7+deb8u1ubuntu0.1~esm1 | < 3.0.24-1ubuntu0.1 | < 3.0.26-5ubuntu0.1 | < 3.0.28-2ubuntu0.1","eol":null,"hubHref":null}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://ubuntu.com/security/notices/USN-4886-1","label":"ubuntu.com/security/notices/USN-4886-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://ubuntu.com/security/CVE-2020-35502","label":"ubuntu.com/security/CVE-2020-35502","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2021-20209","label":"ubuntu.com/security/CVE-2021-20209","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2021-20210","label":"ubuntu.com/security/CVE-2021-20210","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2021-20211","label":"ubuntu.com/security/CVE-2021-20211","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2021-20212","label":"ubuntu.com/security/CVE-2021-20212","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2021-20213","label":"ubuntu.com/security/CVE-2021-20213","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2021-20214","label":"ubuntu.com/security/CVE-2021-20214","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2021-20215","label":"ubuntu.com/security/CVE-2021-20215","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2021-20216","label":"ubuntu.com/security/CVE-2021-20216","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2021-20217","label":"ubuntu.com/security/CVE-2021-20217","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2021-20272","label":"ubuntu.com/security/CVE-2021-20272","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2021-20273","label":"ubuntu.com/security/CVE-2021-20273","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2021-20275","label":"ubuntu.com/security/CVE-2021-20275","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2021-20276","label":"ubuntu.com/security/CVE-2021-20276","hostname":"ubuntu.com","tags":["REPORT"]}],"lineage":{"upstream":["CVE-2020-35502","CVE-2021-20209","CVE-2021-20210","CVE-2021-20211","CVE-2021-20212","CVE-2021-20213","CVE-2021-20214","CVE-2021-20215","CVE-2021-20216","CVE-2021-20217","CVE-2021-20272","CVE-2021-20273","CVE-2021-20275","CVE-2021-20276"],"downstream":[],"duplicates":[],"related":["CVE-2020-35502","CVE-2021-20209","CVE-2021-20210","CVE-2021-20211","CVE-2021-20212","CVE-2021-20213","CVE-2021-20214","CVE-2021-20215","CVE-2021-20216","CVE-2021-20217","CVE-2021-20272","CVE-2021-20273","CVE-2021-20275","CVE-2021-20276"]},"timeline":[{"kind":"published","date":"2021-03-22T16:55:19.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-06-29T13:48:17.434Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":0,"level":"minimal","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-19T23:52:52.920Z","stale":false,"partial":false}}