CVE-2021-29974

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.

• https://bugzilla.mozilla.org/show_bug.cgi?id=1704843Issue Tracking, Vendor Advisory
• https://security.gentoo.org/glsa/202202-03Third Party Advisory
• https://www.mozilla.org/security/advisories/mfsa2021-28/Vendor Advisory
• https://bugzilla.mozilla.org/show_bug.cgi?id=1704843Issue Tracking, Vendor Advisory
• https://security.gentoo.org/glsa/202202-03Third Party Advisory
• https://www.mozilla.org/security/advisories/mfsa2021-28/Vendor Advisory

Published

Aug 5, 2021

Last Modified

Jun 17, 2026

Status

Modified

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