CVSS 3.1 Score 5.3 of 10 (medium)


Published Dec 24, 2023
Updated: Feb 2, 2024
CWE ID 345


CVE-2023-51766 is a cyber vulnerability that affects Exim versions before 4.97.1. It allows for SMTP smuggling in certain PIPELINING/CHUNKING configurations, enabling remote attackers to inject e-mail messages with a spoofed MAIL FROM address. This can bypass SPF protection mechanisms since Exim supports ., which other popular e-mail servers do not. The vulnerability has a risk score of 31 and a base severity of MEDIUM. It does not require any privileges or user interaction to exploit and can be executed over the network. The potential danger it poses to an organization includes low integrity impact and no confidentiality impact, but it could lead to unauthorized access or disruption of services. Remediation includes updating Exim to version 4.97.1 or newer.

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