SARA / Free Tools / CVE / CVE-2020-12421

CVE-2020-12421 — When performing add-on updates, certificate chains terminating in non-built-in-r

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 This could have caused add-ons to become out-of-date silently without notification to the user.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

CVSS
— —
EPSS
1.09% (top 22.30%)
CWE
—
Published
2020-07-09T14:39:37.000Z
Last modified
2024-08-04T11:56:51.888Z
CVSS vector
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01What is this vulnerability?

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 This could have caused add-ons to become out-of-date silently without notification to the user.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

02Affected products

VendorProductVersions
MozillaFirefox ESRunspecified
MozillaFirefoxunspecified
MozillaThunderbirdunspecified

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

09References

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