Improper Following of a Certificate's Chain of Trust Affecting firefox package, versions *


Severity

Recommended
0.0
medium
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
1.84% (77th percentile)

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  • Snyk IDSNYK-RHEL10-FIREFOX-22253398
  • published6 Nov 2026
  • disclosed30 Jun 2020

Introduced: 30 Jun 2020

CVE-2020-12421  (opens in a new tab)
CWE-296  (opens in a new tab)

How to fix?

There is no fixed version for RHEL:10 firefox.

NVD Description

Note: Versions mentioned in the description apply only to the upstream firefox package and not the firefox package as distributed by RHEL. See How to fix? for RHEL:10 relevant fixed versions and status.

When performing add-on updates, certificate chains terminating in non-built-in-roots were rejected (even if they were legitimately added by an administrator.) This could have caused add-ons to become out-of-date silently without notification to the user. This vulnerability affects Firefox ESR < 68.10, Firefox < 78, and Thunderbird < 68.10.0.

CVSS Base Scores

version 3.1