CVE-2021-23996

high
Published — · Modified —
CVSS v3
CVSS v2
VIR risk
8.0

Description

By utilizing 3D CSS in conjunction with Javascript, content could have been rendered outside the webpage's viewport, resulting in a spoofing attack that could have been used for phishing or other attacks on a user. 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-2021-23996

vendor Authored 2026-05-27

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

OS impact

OSVersionStatusFixed in
arch archfixed88.0-1
debian debiansidfixed88.0-1

References

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