Is CVE-2021-29974 in the CISA KEV catalog?

No. CVE-2021-29974 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-29974?

CVE-2021-29974 has a CVSS v3 base score of 4.3 (MEDIUM).

What is the EPSS score for CVE-2021-29974?

CVE-2021-29974 has an EPSS score of 0.84% (53th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-29974?

Upgrade firefox on debian unstable to 90.0-1 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2021-29974

MEDIUM

4.3

CVSS v3

NVD

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.

How to fix

Remediation Available

firefoxDebian

Fixed in:90.0-1CVE-2021-29974

firefoxUbuntu

Fixed in:90.0+build1-0ubuntu0.18.04.1USN-5011-1

Fixed in:90.0+build1-0ubuntu0.20.04.1USN-5011-1

DeveloperEditionWindows application

Affected:90.0Fixed in:90.0Mozilla

Mozilla Firefox (en-US)Windows application

Affected:90.0Fixed in:90.0Mozilla

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityLow

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Exploit Intelligence

0.84%probability of exploitation in 30 days

53rdpercentile

Moderate risk: more likely to be exploited than 53% of all known CVEs.

References

Vendor Advisory2

Third-Party Advisory1

security.gentoo.org

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.