CVE-2025-3576: Krb5: kerberos rc4-hmac-md5 checksum vulnerability enabling message spoofing via md5 collisions

Description

A vulnerability in the MIT Kerberos implementation allows GSSAPI-protected messages using RC4-HMAC-MD5 to be spoofed due to weaknesses in the MD5 checksum design. If RC4 is preferred over stronger encryption types, an attacker could exploit MD5 collisions to forge message integrity codes. This may lead to unauthorized message tampering.

Classification

CVE ID: CVE-2025-3576

Problem Types

Use of Weak Hash

Affected Products

Vendor: Red Hat

Product: Red Hat Ansible Automation Platform 2, Red Hat Ansible Automation Platform 2, Red Hat Ansible Automation Platform 2, Red Hat Ansible Automation Platform 2, Red Hat Ansible Automation Platform 2, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.01% (probability of being exploited)

EPSS Percentile: 1.03% (scored less or equal to compared to others)

EPSS Date: 2025-04-16 (when was this score calculated)

References

https://nvd.nist.gov/vuln/detail/CVE-2025-3576
https://access.redhat.com/security/cve/CVE-2025-3576
https://bugzilla.redhat.com/show_bug.cgi?id=2359465

Timeline