CVE-2021-20617: Acmailer

Critical severity, CVSS 9.8. EPSS: 7.4% chance of exploitation in the next 30 days.

Improper access control vulnerability in acmailer ver. 4.0.1 and earlier, and acmailer DB ver. 1.1.3 and earlier allows remote attackers to execute an arbitrary OS command, or gain an administrative privilege which may result in obtaining the sensitive information on the server via unspecified vectors.

Affected products

• Acmailer Acmailer: up to and including 4.0.1
• Acmailer Acmailer DB: up to and including 1.1.3

Published 2021-01-14. Last modified 2026-06-17.