CVE-2025-29954: Windows Lightweight Directory Access Protocol (LDAP) Denial of Service Vulnerability

Overview

Severity

Medium (CVSS 5.9)

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C

Category

Denial of Service

Exploit Status

Not Exploited

Exploitation Likelihood

Unlikely

Patch Tuesday

2025-May

Released

2025-05-13

Last Updated

2025-09-09

EPSS Score

0.61% (percentile: 69.7%)

Description

Uncontrolled resource consumption in Windows LDAP - Lightweight Directory Access Protocol allows an unauthorized attacker to deny service over a network.

FAQ

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 invest time in repeated exploitation attempts through sending constant or intermittent data. Are there additional actions I need to take to harden my system against unauthenticated RPC calls? Possibly. Refer to KB5066014—Netlogon RPC Hardening (CVE-2025-49716) - Microsoft Support for additional follow-up actions you might need to take.

Affected Products (33)

Windows

• Windows 10 Version 1809 for 32-bit Systems
• Windows 10 Version 1809 for x64-based Systems
• Windows Server 2019
• Windows Server 2019 (Server Core installation)
• Windows Server 2022
• Windows Server 2022 (Server Core installation)
• Windows 10 Version 21H2 for 32-bit Systems
• Windows 10 Version 21H2 for ARM64-based Systems
• Windows 10 Version 21H2 for x64-based Systems
• Windows 11 Version 23H2 for ARM64-based Systems
• Windows 11 Version 23H2 for x64-based Systems
• Windows Server 2022, 23H2 Edition (Server Core installation)
• Windows 10 for 32-bit Systems
• Windows 10 for x64-based Systems
• Windows 10 Version 1607 for 32-bit Systems
• Windows 10 Version 1607 for x64-based Systems
• Windows Server 2016
• Windows Server 2016 (Server Core installation)

ESU

• Windows 11 Version 22H2 for ARM64-based Systems
• Windows 11 Version 22H2 for x64-based Systems
• Windows 10 Version 22H2 for x64-based Systems
• Windows 10 Version 22H2 for ARM64-based Systems
• Windows 10 Version 22H2 for 32-bit Systems
• Windows Server 2008 for 32-bit Systems Service Pack 2
• Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)
• Windows Server 2008 for x64-based Systems Service Pack 2
• Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)
• Windows Server 2008 R2 for x64-based Systems Service Pack 1
• Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
• Windows Server 2012
• Windows Server 2012 (Server Core installation)
• Windows Server 2012 R2
• Windows Server 2012 R2 (Server Core installation)

Security Updates (14)

• 5058392
• 5058385
• 5058500
• 5058379
• 5058405
• 5058384
• 5058387
• 5058383
• 5058449
• 5058429
• 5058430
• 5058454
• 5058451
• 5058403

Acknowledgments

Dan Reynolds, <a href="https://bsky.app/profile/hexnomad.bsky.social">Erik Egsgard</a> with <a href="https://fieldeffect.com/">Field Effect</a>

Revision History

• 2025-05-13: Information published.
• 2025-08-07: Added an acknowledgement. This is an informational change only.
• 2025-09-09: Added an FAQ to provide a link to KB5066014—Netlogon RPC Hardening (CVE-2025-49716) - Microsoft Support. The article provides further guidance for hardening systems against unauthenticated RPC calls. This is an informational change only.