Spoofing Vulnerability in MIT Kerberos Implemented in Various Products

CVE-2025-3576

What is CVE-2025-3576?

A vulnerability exists in the MIT Kerberos implementation that exposes GSSAPI-protected messages to spoofing attacks. This issue arises from weaknesses in the MD5 checksum design when using RC4-HMAC-MD5 as the encryption standard. If an attacker is able to exploit this vulnerability, they could create MD5 collisions, allowing them to forge message integrity codes and manipulate message content without detection. Such unauthorized tampering could compromise the integrity and confidentiality of communications secured by Kerberos.

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References