CVE-2021-29974

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.

4.3

CVSS

Severity: Medium

CVSS 3.1 •

CVSS 2.0 •

EPSS 0.39%

Vendor Advisory gentoo.org Vendor Advisory mozilla.org Vendor Advisory mozilla.org

Affected: Mozilla Firefox

References

Link	Tags
https://www.mozilla.org/security/advisories/mfsa2021-28/	vendor advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1704843	vendor advisory issue tracking
https://security.gentoo.org/glsa/202202-03	third party advisory vendor advisory

Frequently Asked Questions

What is the severity of CVE-2021-29974?: CVE-2021-29974 has been scored as a medium severity vulnerability.
How to fix CVE-2021-29974?: To fix CVE-2021-29974, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-29974 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2021-29974 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-29974?: CVE-2021-29974 affects Mozilla Firefox.

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