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CVE-2025-3576

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

At a glance

Severity
MEDIUM 5.9
EPSS
EPSS 0.35 % · percentile 29 (2026-10-27)
State
PUBLISHED
Published
Updated
Assigner
redhat
NVD status
Deferred

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.

Scores

VersionScoreVectorScored by
CVSS 3.1MEDIUM 5.9CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:Nredhat
CVSS 3.1MEDIUM 5.9CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:NNVD · secalert@redhat.com (Secondary)

Weaknesses (CWE)

European references

CERT-FR advisories

Affected products

ProductVersions
krb5affected 0 < 1.22
Red Hat · Red Hat Enterprise Linux 10unaffected 0:1.21.3-8.el10_0 < *
Red Hat · Red Hat Enterprise Linux 8unaffected 0:1.18.2-32.el8_10 < *
Red Hat · Red Hat Enterprise Linux 8.2 Advanced Update Supportunaffected 0:1.17-19.el8_2.3 < *
Red Hat · Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Supportunaffected 0:1.18.2-9.el8_4.3 < *
Red Hat · Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-Onunaffected 0:1.18.2-9.el8_4.3 < *
Red Hat · Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Supportunaffected 0:1.18.2-16.el8_6.4 < *
Red Hat · Red Hat Enterprise Linux 8.6 Telecommunications Update Serviceunaffected 0:1.18.2-16.el8_6.4 < *
Red Hat · Red Hat Enterprise Linux 8.6 Update Services for SAP Solutionsunaffected 0:1.18.2-16.el8_6.4 < *
Red Hat · Red Hat Enterprise Linux 8.8 Telecommunications Update Serviceunaffected 0:1.18.2-26.el8_8.5 < *
Red Hat · Red Hat Enterprise Linux 8.8 Update Services for SAP Solutionsunaffected 0:1.18.2-26.el8_8.5 < *
Red Hat · Red Hat Enterprise Linux 9unaffected 0:1.21.1-8.el9_6 < *
Red Hat · Red Hat Enterprise Linux 9unaffected 0:1.21.1-8.el9_6 < *
Red Hat · Red Hat Enterprise Linux 9.0 Update Services for SAP Solutionsunaffected 0:1.19.1-16.el9_0.4 < *
Red Hat · Red Hat Enterprise Linux 9.2 Update Services for SAP Solutionsunaffected 0:1.20.1-9.el9_2.3 < *
Red Hat · Red Hat Enterprise Linux 9.4 Extended Update Supportunaffected 0:1.21.1-2.el9_4.2 < *
Red Hat · Red Hat Discovery 2unaffected 2.0.0-1752592913 < *
Red Hat · Red Hat Enterprise Linux 6
Red Hat · Red Hat Enterprise Linux 7
Red Hat · Red Hat OpenShift Container Platform 4

References

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD