CVE-2023-51765
5.3 · MEDIUMOverview
CVE-2023-51765 is a medium-severity vulnerability affecting sendmail sendmail. It was published on December 24, 2023 and has a CVSS 3.1 base score of 5.3 (MEDIUM).
This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
sendmail through 8.17.2 allows SMTP smuggling in certain configurations. Remote attackers can use a published exploitation technique to inject e-mail messages with a spoofed MAIL FROM address, allowing bypass of an SPF protection mechanism. This occurs because sendmail supports <LF>.<CR><LF> but some other popular e-mail servers do not. This is resolved in 8.18 and later versions with 'o' in srv_features.
Remediation
Check the references section for vendor advisories and patches from sendmail. Update sendmail to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| sendmail | sendmail | >= 0, < 8.18.0.2 | Affected |
| freebsd | freebsd | >= 0, < 11.0 | Affected |
References
Frequently Asked Questions
What is CVE-2023-51765?
CVE-2023-51765 is a medium-severity vulnerability affecting sendmail sendmail. It was published on December 24, 2023 and has a CVSS 3.1 base score of 5.3 (MEDIUM).
How severe is CVE-2023-51765?
This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2023-51765?
Check the references section for vendor advisories and patches from sendmail. Update sendmail to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2023-51765?
CyberStrike's AI-powered security agents can automatically detect CVE-2023-51765 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
Automated penetration testing that runs continuously, not just quarterly.
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