vulnerability
Arch Linux: Information disclosure (CVE-2021-43542)
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 4 | (AV:N/AC:M/Au:N/C:P/I:N/A:N) | Dec 8, 2021 | Jul 11, 2025 | Mar 25, 2026 |
Severity
4
CVSS
(AV:N/AC:M/Au:N/C:P/I:N/A:N)
Published
Dec 8, 2021
Added
Jul 11, 2025
Modified
Mar 25, 2026
Description
A security issue has been found in Firefox before version 95 and Thunderbird before version 91.4.0. Using XMLHttpRequest, an attacker could have identified installed applications by probing error messages for loading external protocols.
Solution
arch-linux-upgrade-latest
References
Rapid7 Labs
2026 Global Threat Landscape Report
The predictive window has collapsed. Exploitation follows disclosure in days. See how attackers are accelerating and how to stay ahead.