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krb5: Kerberos RC4-HMAC-MD5 Checksum Vulnerability Enabling Message Spoofing via MD5 Collisions

🗓️ 02 Sep 2025 02:59:04Reported by RedHatType 
redhat
 redhat🔗 access.redhat.com👁 3 Views

Kerberos MD5 checksum weakness enables spoofing of GSSAPI messages when using RC4 encryption.

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OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux8.4i686krb5-debuginfo1.18.2-9.el8_4.3krb5-debuginfo-1.18.2-9.el8_4.3.i686.rpm
Red Hat Enterprise Linux8.4x86_64krb5-debuginfo1.18.2-9.el8_4.3krb5-debuginfo-1.18.2-9.el8_4.3.x86_64.rpm
Red Hat Enterprise Linux8.4i686krb5-debugsource1.18.2-9.el8_4.3krb5-debugsource-1.18.2-9.el8_4.3.i686.rpm
Red Hat Enterprise Linux8.4x86_64krb5-debugsource1.18.2-9.el8_4.3krb5-debugsource-1.18.2-9.el8_4.3.x86_64.rpm
Red Hat Enterprise Linux8.4i686krb5-devel1.18.2-9.el8_4.3krb5-devel-1.18.2-9.el8_4.3.i686.rpm
Red Hat Enterprise Linux8.4x86_64krb5-devel1.18.2-9.el8_4.3krb5-devel-1.18.2-9.el8_4.3.x86_64.rpm
Red Hat Enterprise Linux8.4i686krb5-devel-debuginfo1.18.2-9.el8_4.3krb5-devel-debuginfo-1.18.2-9.el8_4.3.i686.rpm
Red Hat Enterprise Linux8.4x86_64krb5-devel-debuginfo1.18.2-9.el8_4.3krb5-devel-debuginfo-1.18.2-9.el8_4.3.x86_64.rpm
Red Hat Enterprise Linux8.4i686krb5-libs1.18.2-9.el8_4.3krb5-libs-1.18.2-9.el8_4.3.i686.rpm
Red Hat Enterprise Linux8.4x86_64krb5-libs1.18.2-9.el8_4.3krb5-libs-1.18.2-9.el8_4.3.x86_64.rpm
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30 Jun 2026 03:16Current
7.1High risk
Vulners AI Score7.1
CVSS 3.15.9
EPSS0.00308
SSVC
CWE-328
KerberosMessage digest collisionsMessage spoofingGSSAPI protectedRC4 encryption
3