CVE-2021-27183: Altn MDaemon

High severity, CVSS 7.2. EPSS: 2.7% chance of exploitation in the next 30 days.

An issue was discovered in MDaemon before 20.0.4. Administrators can use Remote Administration to exploit an Arbitrary File Write vulnerability. An attacker is able to create new files in any location of the filesystem, or he may be able to modify existing files. This vulnerability may directly lead to Remote Code Execution.

Affected products

• Altn MDaemon: before 20.0.4 (fixed in 20.0.4)

Published 2021-04-14. Last modified 2026-06-17.