CVE-2021-23998

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

Description

Through complicated navigations with new windows, an HTTP page could have inherited a secure lock icon from an HTTPS page. This vulnerability affects Firefox ESR < 78.10, Thunderbird < 78.10, and 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-2021-23998

vendor Authored 2026-05-27

Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2021-23998.html

vendor Authored 2026-05-27

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

vendor Authored 2026-05-27

Vendor advisory: arch — https://security.archlinux.org/ASA-202104-4

OS impact

OSVersionStatusFixed in
arch archfixed78.10.0-1
suse slesaffected
debian debiansidfixed88.0-1
debian debianbookwormfixed78.10.0esr-1
debian debianbullseyefixed78.10.0esr-1
debian debianforkyfixed78.10.0esr-1
debian debiantrixiefixed78.10.0esr-1

References

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