CVE-2010-4021: Mit Kerberos 5

Low severity, CVSS 2.1. EPSS: 2.1% chance of exploitation in the next 30 days.

The Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) 1.7 does not properly restrict the use of TGT credentials for armoring TGS requests, which might allow remote authenticated users to impersonate a client by rewriting an inner request, aka a "KrbFastReq forgery issue."

Affected products

• Mit Kerberos 5: version 1.7 only

Published 2010-12-02. Last modified 2026-06-16.