CVE-2021-29965

Name: CVE-2021-29965
Creator: NVD / NIST
Published: 2021-06-24T14:15:10.363+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 0.74%

Last modified Jun 17, 2026

CVE-2021-29965 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. A malicious website that causes an HTTP Authentication dialog to be spawned could trick the built-in password manager to suggest passwords for the currently active website instead of the website that triggered the dialog. *This bug only affects Firefox for Android. EPSS estimates a 0.74% chance of exploitation in the next 30 days.

Description

A malicious website that causes an HTTP Authentication dialog to be spawned could trick the built-in password manager to suggest passwords for the currently active website instead of the website that triggered the dialog. *This bug only affects Firefox for Android. Other operating systems are unaffected.*. This vulnerability affects Firefox < 89.

Metrics

CVSS 3.1

5.3/10

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

EPSS Probability

0.74%

49.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-610

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 89.0

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1709257Permissions Required, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2021-23/Release Notes, Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1709257Permissions Required, Vendor 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-2021-29965?

How severe is CVE-2021-29965?

CVE-2021-29965 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 0.74% probability of exploitation in the next 30 days.

How do I fix CVE-2021-29965?

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-2021-29965?

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

Scan your code now

Source: NVD / NIST