CVE-2025-33071: Windows KDC Proxy Service (KPSSVC) Remote Code Execution Vulnerability

Overview

Severity
High (CVSS 8.1)
CVSS Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Category
Remote Code Execution
Exploit Status
Not Exploited
Exploitation Likelihood
More Likely
Patch Tuesday
2025-Jun
Released
2025-06-10
EPSS Score
1.39% (percentile: 80.4%)

Description

Use after free in Windows KDC Proxy Service (KPSSVC) allows an unauthorized attacker to execute code over a network.

FAQ

How could an attacker exploit this vulnerability? An unauthenticated attacker could use a specially crafted application to leverage a cryptographic protocol vulnerability in Kerberos Key Distribution Center Proxy Service to perform remote code execution against the target. Are all Windows Servers affected by this vulnerability? This vulnerability only affects Windows Servers that are configured as a [MS-KKDCP]: Kerberos Key Distribution Center (KDC) Proxy Protocol server. Domain controllers are not affected. According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability? Successful exploitation of this vulnerability requires an attacker to win a race condition.

Affected Products (13)

Windows

  • Windows Server 2019
  • Windows Server 2019 (Server Core installation)
  • Windows Server 2022
  • Windows Server 2022 (Server Core installation)
  • Windows Server 2025 (Server Core installation)
  • Windows Server 2022, 23H2 Edition (Server Core installation)
  • Windows Server 2025
  • Windows Server 2016
  • Windows Server 2016 (Server Core installation)

ESU

  • Windows Server 2012
  • Windows Server 2012 (Server Core installation)
  • Windows Server 2012 R2
  • Windows Server 2012 R2 (Server Core installation)

Security Updates (9)

Acknowledgments

<a href="https://twitter.com/keyz3r0">k0shl</a> with <a href="https://www.cyberkl.com/">Kunlun Lab</a>, ʌ!ɔ⊥ojv with Kunlun Lab

Revision History

  • 2025-06-10: Information published.