CVE-2020-12421
6.5
MEDIUM
CVSS 3.1
EPSS 1.1%
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 This could have caused add-ons to become out-of-date silently without notification to the user.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.
How to fix CVE-2020-12421
To remediate CVE-2020-12421, upgrade the affected package to a fixed version below.
- —upgrade to 68.10.0esr-1 or later
- —upgrade to 1:68.10.0-1 or later
Is CVE-2020-12421 being exploited?
Low — EPSS is 1.1%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 68.10.0esr-1
- from 0, < 1:68.10.0-1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N |