CVE-2021-21178

high

Published — · Modified —

CVSS v3

—

CVSS v2

—

VIR risk

8.0

Description

Inappropriate implementation in Compositing in Google Chrome on Linux and Windows prior to 89.0.4389.72 allowed a remote attacker to spoof the contents of the Omnibox (URL bar) via a crafted HTML page.

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-2021-21178

vendor Authored 2026-05-27

Vendor advisory: arch — https://security.archlinux.org/ASA-202103-19

OS impact

OS	Version	Status	Fixed in
arch		fixed	`3.7.2218.45-1`
debian	bookworm	fixed	`89.0.4389.82-1`
debian	bullseye	fixed	`89.0.4389.82-1`
debian	forky	fixed	`89.0.4389.82-1`
debian	sid	fixed	`89.0.4389.82-1`
debian	trixie	fixed	`89.0.4389.82-1`

References

https://security.archlinux.org/ASA-202103-19
https://security-tracker.debian.org/tracker/CVE-2021-21178

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