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Spam Filtering 1 min read

Remote Vulnerability Affecting Over 50% of Mail Servers

Brad Slavin
Brad Slavin General Manager
Updated May 24, 2025

Quick Answer

A remote code execution vulnerability in the Exim mail server allowed an attacker to run commands as root, exposing roughly half of internet mail servers running Exim. Operators should patch immediately. Sites that route inbound mail through a cloud email gateway are shielded from direct internet exposure of the vulnerable Exim host.

mail servers

A remote vulnerability has been discovered in the EXIM email server that allows an attacker to run commands as root.

https://www.zdnet.com/article/new-rce-vulnerability-impacts-nearly-half-of-the-internets-email-servers/

If your mail server is running EXIM our email gateway can offer you complete protection from this exploit and can keep your users safe. The service is cloud-deployed and fully managed and can scale from a single domain to hosting providers needing filtering for tens of thousands of domains.

Brad Slavin
Brad Slavin

General Manager

General Manager at DuoCircle. Product strategy and commercial lead across the email security portfolio.

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