{"id":"CVE-2021-29978","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-29978","generatedAt":"2026-10-27T22:33:00.946Z","title":"This vulnerability affects Mozilla VPN < 2.3.","description":"Multiple low security issues were discovered and fixed in a security audit of Mozilla VPN 2.x branch as part of a 3rd party security audit. This vulnerability affects Mozilla VPN < 2.3.","published":"2021-08-05T20:15:09.000Z","lastModified":"2026-06-17T03:48:33.000Z","status":"Modified","sourceIdentifier":"security@mozilla.org","cvss":{"version":"3.1","score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"cwe":[],"affected":["mozilla/mozilla vpn"],"epss":{"score":0.0278,"percentile":0.8628,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (2.78%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://github.com/mozilla-mobile/mozilla-vpn-client/issues/797","tags":["Third Party Advisory"],"source":"security@mozilla.org"},{"url":"https://github.com/mozilla-mobile/mozilla-vpn-client/issues/798","tags":["Third Party Advisory"],"source":"security@mozilla.org"},{"url":"https://github.com/mozilla-mobile/mozilla-vpn-client/issues/799","tags":["Exploit","Third Party Advisory"],"source":"security@mozilla.org"},{"url":"https://github.com/mozilla-mobile/mozilla-vpn-client/issues/800","tags":["Exploit","Third Party Advisory"],"source":"security@mozilla.org"},{"url":"https://github.com/mozilla-mobile/mozilla-vpn-client/issues/801","tags":["Third Party Advisory"],"source":"security@mozilla.org"},{"url":"https://github.com/mozilla-mobile/mozilla-vpn-client/issues/803","tags":["Third Party Advisory"],"source":"security@mozilla.org"},{"url":"https://github.com/mozilla-mobile/mozilla-vpn-client/issues/804","tags":["Third Party Advisory"],"source":"security@mozilla.org"},{"url":"https://github.com/mozilla-mobile/mozilla-vpn-client/issues/805","tags":["Third Party Advisory"],"source":"security@mozilla.org"},{"url":"https://github.com/mozilla-mobile/mozilla-vpn-client/issues/806","tags":["Exploit","Third Party Advisory"],"source":"security@mozilla.org"},{"url":"https://github.com/mozilla-mobile/mozilla-vpn-client/issues/808","tags":["Third Party Advisory"],"source":"security@mozilla.org"},{"url":"https://github.com/mozilla-mobile/mozilla-vpn-client/issues/809","tags":["Third Party Advisory"],"source":"security@mozilla.org"},{"url":"https://github.com/mozilla-mobile/mozilla-vpn-client/issues/810","tags":["Third Party Advisory"],"source":"security@mozilla.org"},{"url":"https://github.com/mozilla-mobile/mozilla-vpn-client/issues/812","tags":["Third Party Advisory"],"source":"security@mozilla.org"},{"url":"https://github.com/mozilla-mobile/mozilla-vpn-client/pull/816","tags":["Patch","Third Party Advisory"],"source":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2021-31/","tags":["Vendor Advisory"],"source":"security@mozilla.org"},{"url":"https://github.com/mozilla-mobile/mozilla-vpn-client/issues/797","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/mozilla-mobile/mozilla-vpn-client/issues/798","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/mozilla-mobile/mozilla-vpn-client/issues/799","tags":["Exploit","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/mozilla-mobile/mozilla-vpn-client/issues/800","tags":["Exploit","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/mozilla-mobile/mozilla-vpn-client/issues/801","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/mozilla-mobile/mozilla-vpn-client/issues/803","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/mozilla-mobile/mozilla-vpn-client/issues/804","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/mozilla-mobile/mozilla-vpn-client/issues/805","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/mozilla-mobile/mozilla-vpn-client/issues/806","tags":["Exploit","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/mozilla-mobile/mozilla-vpn-client/issues/808","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/mozilla-mobile/mozilla-vpn-client/issues/809","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/mozilla-mobile/mozilla-vpn-client/issues/810","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/mozilla-mobile/mozilla-vpn-client/issues/812","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/mozilla-mobile/mozilla-vpn-client/pull/816","tags":["Patch","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.mozilla.org/security/advisories/mfsa2021-31/","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-29978","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}