{"schemaVersion":3,"id":"CVE-2021-29974","aliases":["UBUNTU-CVE-2021-29974"],"status":"published","duplicateOf":null,"title":null,"description":"When network partitioning was enabled, e.g. as a result of Enhanced Tracking Protection settings, a TLS error page would allow the user to override an error on a domain which had specified HTTP Strict Transport Security (which implies that the error should not be override-able.) This issue did not affect the network connections, and they were correctly upgraded to HTTPS automatically. This vulnerability affects Firefox < 90.","dates":{"published":"2021-08-05T19:46:16.000Z","modified":"2024-08-03T22:24:57.587Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":4.3,"severity":"medium","version":"3.1","versionLabel":"v3.1","source":"NVD","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":4.3,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N","exploitability":7.2,"impact":2.3,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":4.3,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":2.6,"severity":"low","vector":"AV:N/AC:H/Au:N/C:N/I:P/A:N","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.0084,"percentile":0.57194,"severity":"low","asOf":"2026-10-20T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-20T00:00:00.000Z","baselineScore":0.0084},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.0084,"percentile":0.57194}],"last30":[{"date":"2026-09-20T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.0084,"percentile":0.57194}]},"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":"firefox","name":"firefox","label":"firefox","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/firefox","purlType":"deb","versions":[{"text":"< 90.0+build1-0ubuntu0.18.04.1","noFixRecorded":false,"fixedIn":null},{"text":"< 90.0+build1-0ubuntu0.20.04.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 90.0+build1-0ubuntu0.18.04.1 | < 90.0+build1-0ubuntu0.20.04.1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"mozjs38","name":"mozjs38","label":"mozjs38","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/mozjs38","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"mozjs52","name":"mozjs52","label":"mozjs52","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/mozjs52","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"mozjs68","name":"mozjs68","label":"mozjs68","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/mozjs68","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"mozjs78","name":"mozjs78","label":"mozjs78","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/mozjs78","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"mozilla","product":"firefox","name":"Firefox","label":"firefox","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ unspecified, < 90","noFixRecorded":false,"fixedIn":null},{"text":"< 90.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ unspecified, < 90 | < 90.0","eol":{"isEol":null,"eolDate":null,"matchMethod":"cpe","cycle":null,"product":{"name":"firefox","label":"Firefox","category":"app"}},"hubHref":"/vendor/mozilla/firefox"}],"affectedCount":6,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://www.mozilla.org/security/advisories/mfsa2021-28/","label":"www.mozilla.org/security/advisories/mfsa2021-28/","hostname":"www.mozilla.org","tags":["X Refsource MISC","Vendor Advisory"]},{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1704843","label":"bugzilla.mozilla.org/show_bug.cgi?id=1704843","hostname":"bugzilla.mozilla.org","tags":["X Refsource MISC","Issue Tracking","Vendor Advisory"]},{"url":"https://security.gentoo.org/glsa/202202-03","label":"security.gentoo.org/glsa/202202-03","hostname":"security.gentoo.org","tags":["Vendor Advisory","X Refsource GENTOO","Third Party Advisory"]},{"url":"https://ubuntu.com/security/CVE-2021-29974","label":"ubuntu.com/security/CVE-2021-29974","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.mozilla.org/en-US/security/advisories/mfsa2021-28/#CVE-2021-29974","label":"www.mozilla.org/en-US/security/advisories/mfsa2021-28/","hostname":"www.mozilla.org","tags":["REPORT"]},{"url":"https://ubuntu.com/security/notices/USN-5011-1","label":"ubuntu.com/security/notices/USN-5011-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-29974","label":"www.cve.org/CVERecord?id=CVE-2021-29974","hostname":"www.cve.org","tags":["REPORT"]}],"lineage":{"upstream":[],"downstream":["OPENSUSE-SU-2024:10600-1","OPENSUSE-SU-2024:14572-1","USN-5011-1"],"duplicates":[],"related":["OPENSUSE-SU-2024:10600-1","OPENSUSE-SU-2024:14572-1","USN-5011-1"]},"timeline":[{"kind":"published","date":"2021-08-05T19:46:16.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2024-08-03T22:24:57.587Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":17,"level":"low","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-21T02:16:46.491Z","stale":false,"partial":false}}