MITM6-Kerberos-CNAME-Abuse exploit

Exploit for CVE-2026-20929. CVSS 7.5.

Published 29 Sep 2026Updated 29 Sep 2026149 sources
CVSS 7.5 PoC CANDIDATE

What happened

Windows Kerberos client CNAME abuse enables cross-protocol relay attacks via forced TGS request.

Affected versions

Unknown product: See original advisory Fixed: See vendor advisory.

Why it matters

This source correlation may provide earlier visibility while structured CVE metadata is still being updated.

Detection & mitigation

  • Review the original advisory and validate affected versions.
  • Apply vendor-provided updates or mitigations when available.

Public PoC references