CVE-2010-4021: The Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) 1.7 does not properly restrict the use of TG...

Security readout for executives and security teams

This flaw affects the Kerberos authentication server role in MIT Kerberos 5 1.7. An authenticated remote user may be able to manipulate protected ticket requests and impersonate another client. That makes it a serious identity and access-control issue where affected Kerberos KDCs are still in use. Exposure is most likely in environments running MIT Kerberos 5 1.7 KDCs or vendor-distributed krb5 packages covered by the cited advisories. The bundle does not prove exposure for every referenced vendor product, so asset and package validation is required. Prioritize remediation if any production Kerberos KDC still matches the affected MIT krb5 lineage. Kerberos is core authentication infrastructure, so successful impersonation can undermine multiple dependent systems. If modern supported packages are deployed, urgency is mainly verification and documentation. Mitigation focus: Identify Kerberos KDCs and confirm whether MIT krb5 1.7 is present.; Review MITKRB5-SA-2010-007 and applicable vendor advisories for fixed package guidance.; Apply vendor-supported krb5 updates where affected versions are confirmed..

Prepared

Jun 28, 2026, 01:17 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.