CVE-2021-29973

Name: CVE-2021-29973
Creator: NVD / NIST
Published: 2021-08-05T20:15:08.657+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 0.81%

Last modified Jun 17, 2026

CVE-2021-29973 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. Password autofill was enabled without user interaction on insecure websites on Firefox for Android. This was corrected to require user interaction with the page before a user's password would be entered by the browser's autofill functionality *This bug only affects Firefox for Android. EPSS estimates a 0.81% chance of exploitation in the next 30 days.

Description

Password autofill was enabled without user interaction on insecure websites on Firefox for Android. This was corrected to require user interaction with the page before a user's password would be entered by the browser's autofill functionality *This bug only affects Firefox for Android. Other operating systems are unaffected.*. This vulnerability affects Firefox < 90.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

0.81%

52.3th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 90.0

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1701932Issue Tracking, Permissions Required
https://www.mozilla.org/security/advisories/mfsa2021-28/Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1701932Issue Tracking, Permissions Required
https://www.mozilla.org/security/advisories/mfsa2021-28/Vendor Advisory

Timeline

Published: Aug 5, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-29973?

How severe is CVE-2021-29973?

CVE-2021-29973 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.81% probability of exploitation in the next 30 days.

How do I fix CVE-2021-29973?

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-2021-29973?

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

Scan your code now

Source: NVD / NIST