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THREATINT
PUBLISHED

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.

Reserved 2025-04-14 | Published 2025-04-15 | Updated 2025-04-17 | Assigner redhat


MEDIUM: 5.9CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Problem types

Use of Weak Hash

Product status

Default status
affected

Default status
affected

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affected

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affected

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affected

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unknown

Default status
unknown

Default status
affected

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affected

Default status
affected

Timeline

2025-04-14:Reported to Red Hat.
2025-04-15:Made public.

References

access.redhat.com/security/cve/CVE-2025-3576 vdb-entry

bugzilla.redhat.com/show_bug.cgi?id=2359465 (RHBZ#2359465) issue-tracking

cve.org (CVE-2025-3576)

nvd.nist.gov (CVE-2025-3576)

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