CVE-2020-15668

Name: CVE-2020-15668
Creator: NVD / NIST
Published: 2020-10-01T19:15:13.33+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.3/10EPSS 0.53%

Last modified Jun 17, 2026

CVE-2020-15668 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. A lock was missing when accessing a data structure and importing certificate information into the trust database. This vulnerability affects Firefox < 80 and Firefox for Android < 80.. EPSS estimates a 0.53% chance of exploitation in the next 30 days.

Description

A lock was missing when accessing a data structure and importing certificate information into the trust database. This vulnerability affects Firefox < 80 and Firefox for Android < 80.

Metrics

CVSS 3.1

4.3/10

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

EPSS Probability

0.53%

40.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-667

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 80.0

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1651520Issue Tracking, Permissions Required, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-36/Release Notes, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-39/Release Notes, Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1651520Issue Tracking, Permissions Required, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-36/Release Notes, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-39/Release Notes, Vendor Advisory

Timeline

Published: Oct 1, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-15668?

A lock was missing when accessing a data structure and importing certificate information into the trust database. This vulnerability affects Firefox < 80 and Firefox for Android < 80.

How severe is CVE-2020-15668?

CVE-2020-15668 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 0.53% probability of exploitation in the next 30 days.

How do I fix CVE-2020-15668?

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-2020-15668?

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

Scan your code now

Source: NVD / NIST