CVE-2021-29993

Severity: high (CVSS 8.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-11-03 · updated 2026-08-19

Description

Firefox for Android allowed navigations through the `intent://` protocol, which could be used to cause crashes and UI spoofs. *This bug only affects Firefox for Android. Other operating systems are unaffected.*. This vulnerability affects Firefox < 92.

Affected products

Mozilla Firefox for Android: before 92.0 — fixed in 92.0

How to fix

Upgrade to a fixed version: Mozilla Firefox for Android 92.0. Check the vendor advisory for mitigations.

References

https://bugzilla.mozilla.org/buglist.cgi?bug_id=1712242%2C1708767%2C1712240%2C1708544%2C1729259
https://www.mozilla.org/security/advisories/mfsa2021-38/
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1712242%2C1708767%2C1712240%2C1708544%2C1729259
https://www.mozilla.org/security/advisories/mfsa2021-38/

Get alerted when CVE-2021-29993 or the next vulnerability affects your stack