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CVE-2020-12421 is a medium severity vulnerability with a CVSS score of 6.5. No known exploits currently, and patches are available.
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Lower probability of exploitation
EPSS predicts the probability of exploitation in the next 30 days based on real-world threat data, complementing CVSS severity scores with actual risk assessment.
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 This could have caused add-ons to become out-of-date silently without notification to the user.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.
| Vendor | Product |
|---|---|
| Canonical | Ubuntu Linux |
| Mozilla | Firefox Esr |
| Mozilla | Firefox |
| Mozilla | Thunderbird |