CVE-2022-29916

Name: CVE-2022-29916
Creator: NVD / NIST
Published: 2022-12-22T20:15:26.797+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.72%

Last modified Jun 17, 2026

CVE-2022-29916 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. Firefox behaved slightly differently for already known resources when loading CSS resources involving CSS variables. This could have been used to probe the browser history. EPSS estimates a 0.72% chance of exploitation in the next 30 days.

Description

Firefox behaved slightly differently for already known resources when loading CSS resources involving CSS variables. This could have been used to probe the browser history. This vulnerability affects Thunderbird < 91.9, Firefox ESR < 91.9, and Firefox < 100.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

0.72%

49.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-200

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 100.0
Mozilla	Firefox Esr	< 91.9
Mozilla	Thunderbird	< 91.9

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1760674Exploit, Issue Tracking, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2022-16/Exploit, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2022-17/Exploit, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2022-18/Exploit, Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1760674Exploit, Issue Tracking, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2022-16/Exploit, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2022-17/Exploit, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2022-18/Exploit, Vendor Advisory

Timeline

Published: Dec 22, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-29916?

How severe is CVE-2022-29916?

CVE-2022-29916 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.72% probability of exploitation in the next 30 days.

How do I fix CVE-2022-29916?

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-2022-29916?

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

Scan your code now

Source: NVD / NIST