CVE-2021-29953

critical

Published — · Modified —

CVSS v3

—

CVSS v2

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VIR risk

9.5

Description

A malicious webpage could have forced a Firefox for Android user into executing attacker-controlled JavaScript in the context of another domain, resulting in a Universal Cross-Site Scripting vulnerability. *Note: This issue only affected Firefox for Android. Other operating systems are unaffected. Further details are being temporarily withheld to allow users an opportunity to update.*. This vulnerability affects Firefox < 88.0.1 and Firefox for Android < 88.1.3.

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-2021-29953

OS impact

OS	Version	Status	Fixed in
arch		affected
debian	sid	fixed	`0`

References

https://security-tracker.debian.org/tracker/CVE-2021-29953

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