Exim Remote Command Execution via Recipient Address
Actively exploited in the wild. Patch or mitigate immediately — don't wait for a maintenance window.
An unauthenticated attacker, remotely over the network, with no user interaction, can fully compromise the system — steal data, tamper with it and take it offline.
A flaw was found in Exim versions 4.87 to 4.91 (inclusive). Improper validation of recipient address in deliver_message() function in /src/deliver.c may lead to remote command execution.
Inferred from the weakness type (CWE) and how the flaw is reached — the techniques an attacker would chain to exploit this. Real-world corroboration appears here as threat intel is folded in.
Corroborated threat activity referencing this CVE — with source and confidence, not inference.
Named threat actors and observed ATT&CK techniques appear here as intel feeds are folded in — the ATT&CK chain above stays inferred until then.
Generated by Wavense from the CVE record — an immediate mitigation and the permanent fix.
As an interim measure, consider implementing network-level controls such as firewall rules to restrict access to the Exim service from untrusted or external IP addresses. Enhance monitoring of Exim server logs for unusual delivery attempts or unexpected process spawns from the Exim user. While not a complete fix for RCE, ensuring Exim runs with the principle of least privilege can help limit the scope of compromise.
The permanent resolution is to upgrade all affected Exim instances to version 4.92 or later. This addresses the improper validation flaw in the deliver_message() function, patching the vulnerability that allows remote command execution. Ensure all systems running Exim versions 4.87 through 4.91 (inclusive) are updated immediately to prevent exploitation.
An attacker can exploit improper recipient address validation to achieve remote command execution on the Exim server. This grants the attacker full control over the compromised server, allowing for arbitrary code execution, data exfiltration, and potential lateral movement within the network. The technical and business consequences include severe service disruption, potential data breaches, and significant reputational damage.
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