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9.8 — CRITICAL

New Critical Exim Mailer Allows Remote Attacker to Execute Arbitrary Code

📅 14 May 2026 at 15:23 UTC📰 Cyber Security NewsView original source ↗
New Critical Exim Mailer Allows Remote Attacker to Execute Arbitrary Code

A critical vulnerability in the widely used Exim mail server allows unauthenticated attackers to execute arbitrary code and fully compromise exposed servers. Federico Kirschbaum, head of the Security Lab at XBOW, discovered and reported the issue, which has been dubbed Dead.Letter. The vulnerability carries a massive CVSS severity score of 9.8, making it one of […] The post New Critical Exim Mailer Allows Remote Attacker to Execute Arbitrary Code appeared first on Cyber Security News.

🤖 AI BriefingAuto-generated threat analysis
🔍Threat Overview

A critical vulnerability in Exim mail server allows unauthenticated attackers to execute arbitrary code, compromising exposed servers. This vulnerability has been dubbed Dead.Letter and carries a massive CVSS severity score of 9.8.

⚙️Technical Details
Affected Systems
Exim mail server
Attack Vectors
Remote attacker
💥Impact Assessment
Severity: Critical
Who Is at Risk
Exposed servers
🛡️Recommended Actions
1Apply a patch or update to the Exim mail server as soon as possible.
2Disable remote access to the Exim mail server until a fix is available.
3Monitor server logs for suspicious activity and implement intrusion detection systems.
📦Affected Products
Exim mail server

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