CVE-2021-24000

high

Published — · Modified —

CVSS v3

—

CVSS v2

—

VIR risk

8.0

Description

A race condition with requestPointerLock() and setTimeout() could have resulted in a user interacting with one tab when they believed they were on a separate tab. In conjunction with certain elements (such as <input type="file">) this could have led to an attack where a user was confused about the origin of the webpage and potentially disclosed information they did not intend to. This vulnerability affects Firefox < 88.

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-2021-24000

vendor Authored 2026-05-27

Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2021-24000.html

vendor Authored 2026-05-27

Vendor advisory: arch — https://security.archlinux.org/ASA-202104-3

OS impact

OS	Version	Status	Fixed in
arch		fixed	`88.0-1`
sles		affected
debian	sid	fixed	`88.0-1`

References

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