CVE-2021-29975

high

Published — · Modified —

CVSS v3

—

CVSS v2

—

VIR risk

8.0

Description

Through a series of DOM manipulations, a message, over which the attacker had control of the text but not HTML or formatting, could be overlaid on top of another domain (with the new domain correctly shown in the address bar) resulting in possible user confusion. 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-2021-29975

vendor Authored 2026-05-27

Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2021-29975.html

vendor Authored 2026-05-27

Vendor advisory: arch — https://security.archlinux.org/ASA-202107-20

OS impact

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

References

https://security.archlinux.org/ASA-202107-20
https://www.suse.com/security/cve/CVE-2021-29975.html
https://security-tracker.debian.org/tracker/CVE-2021-29975

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