CVE-2020-12421

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CVSS 3.1

6.5 medium

EPSS

2%p78

Published

Jul 9, 2020 (Jul 9, 2020)

Modified

Jun 17, 2026

Description

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 This could have caused add-ons to become out-of-date silently without notification to the user.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.

Vendors: mozilla canonical
Products: firefox, firefox esr, thunderbird, ubuntu linux
Weakness: CWE-295
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

NVD CVE.org GitHub PoCs EPSS (1.8%)

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