CVE-2021-29971

high

Published — · Modified —

CVSS v3

—

CVSS v2

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VIR risk

8.0

Description

If a user had granted a permission to a webpage and saved that grant, any webpage running on the same host - irrespective of scheme or port - would be granted that permission. *This bug only affects Firefox for Android. Other operating systems are unaffected.*. This vulnerability affects Firefox < 90.

Predictions

Exploit likelihood

20%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2021-29971

OS impact

OS	Version	Status	Fixed in
arch		fixed	`90.0-1`
debian	sid	fixed	`0`

References

https://security-tracker.debian.org/tracker/CVE-2021-29971

Verify integrity in audit chain (admin only). AS-IS.