CVE-2021-29960

Name: CVE-2021-29960
Creator: NVD / NIST
Published: 2021-06-24T14:15:10.2+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.3/10EPSS 0.83%

Last modified Jun 17, 2026

CVE-2021-29960 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. Firefox used to cache the last filename used for printing a file. When generating a filename for printing, Firefox usually suggests the web page title. EPSS estimates a 0.83% chance of exploitation in the next 30 days.

Description

Firefox used to cache the last filename used for printing a file. When generating a filename for printing, Firefox usually suggests the web page title. The caching and suggestion techniques combined may have lead to the title of a website visited during private browsing mode being stored on disk. This vulnerability affects Firefox < 89.

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

0.83%

52.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-669

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	>= 78.11.0, < 89.0

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1675965Issue Tracking, Permissions Required, Vendor Advisory
https://security.gentoo.org/glsa/202107-09Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2021-23/Release Notes, Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1675965Issue Tracking, Permissions Required, Vendor Advisory
https://security.gentoo.org/glsa/202107-09Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2021-23/Release Notes, Vendor Advisory

Timeline

Published: Jun 24, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-29960?

How severe is CVE-2021-29960?

CVE-2021-29960 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 0.83% probability of exploitation in the next 30 days.

How do I fix CVE-2021-29960?

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-2021-29960?

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

Scan your code now

Source: NVD / NIST