VulnerabilityBleeping Computer
9.8 — CRITICAL
New critical Exim mailer flaw allows remote code execution
A critical vulnerability affecting certain configurations of the Exim open-source mail transfer agent could be exploited by an unauthenticated remote attacker to execute arbitrary code. [...]
🤖 AI BriefingAuto-generated threat analysis
🔍Threat Overview
A critical Exim mailer flaw allows remote code execution, impacting certain Linux distributions and potentially allowing attackers to execute commands on the server and access email data.
⚙️Technical Details
CVEs
CVE-2026-45185
Affected Systems
Exim versions before 4.99.3Linux serversDebian-based distributionsUbuntu-based distributions
Attack Vectors
NETWORK
💥Impact Assessment
Severity: CRITICAL
Who Is at Risk
users of Ubuntu and Debian-based Linux distributionsSeverity: CRITICAL
🛡️Recommended Actions
1Apply available Exim updates (v4.99.3) through package managers
2Disable STARTTLS and CHUNKING advertising in Exim configurations
3Monitor server logs for suspicious activity
📦Affected Products
Exim open-source mail transfer agent
🔐NVD Verified DataVERIFIED
CVE-2026-45185 ↗CVSS 9.8 — CRITICAL
Attack Vector
NETWORK
Complexity
LOW
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HWeaknesses
CWE-416
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