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.

Remediation

Workaround:

  • Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

Category

5.9
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.01%
Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com
Affected: Red Hat Red Hat Enterprise Linux 10
Affected: Red Hat Red Hat Enterprise Linux 8
Affected: Red Hat Red Hat Enterprise Linux 9
Affected: Red Hat Red Hat Enterprise Linux 9
Affected: Red Hat Red Hat Ansible Automation Platform 2
Affected: Red Hat Red Hat Ansible Automation Platform 2
Affected: Red Hat Red Hat Ansible Automation Platform 2
Affected: Red Hat Red Hat Ansible Automation Platform 2
Affected: Red Hat Red Hat Ansible Automation Platform 2
Affected: Red Hat Red Hat Enterprise Linux 6
Affected: Red Hat Red Hat Enterprise Linux 7
Affected: Red Hat Red Hat OpenShift Container Platform 4
Published at:
Updated at:

References

Link Tags
https://access.redhat.com/errata/RHSA-2025:8411 vendor advisory
https://access.redhat.com/errata/RHSA-2025:9418 vendor advisory
https://access.redhat.com/errata/RHSA-2025:9430 vendor advisory
https://access.redhat.com/security/cve/CVE-2025-3576 vdb entry
https://bugzilla.redhat.com/show_bug.cgi?id=2359465 issue tracking
https://lists.debian.org/debian-lts-announce/2025/05/msg00047.html

Frequently Asked Questions

What is the severity of CVE-2025-3576?
CVE-2025-3576 has been scored as a medium severity vulnerability.
How to fix CVE-2025-3576?
As a workaround for remediating CVE-2025-3576: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Is CVE-2025-3576 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-3576 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-3576?
CVE-2025-3576 affects Red Hat Red Hat Enterprise Linux 10, Red Hat Red Hat Enterprise Linux 8, Red Hat Red Hat Enterprise Linux 9, Red Hat Red Hat Enterprise Linux 9, Red Hat Red Hat Ansible Automation Platform 2, Red Hat Red Hat Ansible Automation Platform 2, Red Hat Red Hat Ansible Automation Platform 2, Red Hat Red Hat Ansible Automation Platform 2, Red Hat Red Hat Ansible Automation Platform 2, Red Hat Red Hat Enterprise Linux 6, Red Hat Red Hat Enterprise Linux 7, Red Hat Red Hat OpenShift Container Platform 4.
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