vulnerability
MFSA2021-54 Thunderbird: Security Vulnerabilities fixed in Thunderbird 91.4.0 (CVE-2021-43542)
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 4 | (AV:N/AC:M/Au:N/C:P/I:N/A:N) | Dec 7, 2021 | Dec 8, 2021 | Aug 12, 2025 |
Severity
4
CVSS
(AV:N/AC:M/Au:N/C:P/I:N/A:N)
Published
Dec 7, 2021
Added
Dec 8, 2021
Modified
Aug 12, 2025
Description
Using XMLHttpRequest, an attacker could have identified installed applications by probing error messages for loading external protocols. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and Firefox < 95.
Solution
mozilla-thunderbird-upgrade-91_4
NEW
Explore Exposure Command
Confidently identify and prioritize exposures from endpoint to cloud with full attack surface visibility and threat-aware risk context.