CVE-2020-28026: Exim

Critical severity, CVSS 9.8. EPSS: 9.3% chance of exploitation in the next 30 days.

Exim 4 before 4.94.2 has Improper Neutralization of Line Delimiters, relevant in non-default configurations that enable Delivery Status Notification (DSN). Certain uses of ORCPT= can place a newline into a spool header file, and indirectly allow unauthenticated remote attackers to execute arbitrary commands as root.

Affected products

• Exim Exim: from 4.00, before 4.94.2 (fixed in 4.94.2)

Published 2021-05-06. Last modified 2026-06-17.