CVE-2023-51766
CVSS 3.1 Score 5.3 of 10 (medium)
Details
Summary
CVE-2023-51766 is a vulnerability affecting Exim email servers before version 4.97.1. It enables SMTP smuggling in specific PIPELINING/CHUNKING configurations. Attackers can take advantage of this issue by injecting e-mail messages with spoofed MAIL FROM addresses. This bypasses SPF protection mechanisms, as Exim accepts <LF>.<CR><LF> line endings while many other popular e-mail servers do not. This vulnerability can potentially lead to email spoofing and unauthorized email delivery. To mitigate this risk, it is recommended to update to the latest version of Exim or implement additional email security measures.
Prevent cyber attacks with Recorded Future by prioritizing and patching critical vulnerabilities being exploited by threat actors targeting your industry. Book your demo to learn more.
Affected Products
- University Of Cambridge Exim
- Exim (Mail Transfer Agent)
- Fedora Operating System
- Debian
- Exim 4.89
Affected Vendors
- Debian
- Fedora Project
- Exim Maintainers
- Export-Import Bank of the United States
- Heiko Schlittermann
Advisories, Assessments, and Mitigations
Prioritize, Pinpoint, and Act to Prevent Vulnerability Exploits with Recorded Future
- Gain complete coverage of your cyber, third party, and physical attack surface
- Proactively mitigate threats before they turn into costly attacks
- Make fast, effective, data-driven decisions