CVE-2020-26957

Name: CVE-2020-26957
Creator: NVD / NIST
Published: 2020-12-09T01:15:13.02+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.54%

Last modified Jun 17, 2026

CVE-2020-26957 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. OneCRL was non-functional in the new Firefox for Android due to a missing service initialization. This could result in a failure to enforce some certificate revocations. EPSS estimates a 0.54% chance of exploitation in the next 30 days.

Description

OneCRL was non-functional in the new Firefox for Android due to a missing service initialization. This could result in a failure to enforce some certificate revocations. *Note: This issue only affected Firefox for Android. Other operating systems are unaffected.*. This vulnerability affects Firefox < 83.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

EPSS Probability

0.54%

41.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-665

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 83.0

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1667179Issue Tracking, Permissions Required, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-50/Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1667179Issue Tracking, Permissions Required, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-50/Vendor Advisory

Timeline

Published: Dec 9, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-26957?

How severe is CVE-2020-26957?

CVE-2020-26957 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.54% probability of exploitation in the next 30 days.

How do I fix CVE-2020-26957?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-26957?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST