CVE-2025-29971: Web Threat Defense (WTD.sys) Denial of Service Vulnerability

Overview

Severity

High (CVSS 7.5)

CVSS Vector

CVSS:3.1/AV:N/AC:L/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

More Likely

Patch Tuesday

2025-May

Released

2025-05-13

Last Updated

2025-05-16

EPSS Score

6.37% (percentile: 91.0%)

Description

Out-of-bounds read in Web Threat Defense (WTD.sys) allows an unauthorized attacker to deny service over a network.

Affected Products (6)

ESU

• Windows 11 Version 22H2 for ARM64-based Systems
• Windows 11 Version 22H2 for x64-based Systems

Windows

• Windows 11 Version 23H2 for ARM64-based Systems
• Windows 11 Version 23H2 for x64-based Systems
• Windows 11 Version 24H2 for ARM64-based Systems
• Windows 11 Version 24H2 for x64-based Systems

Security Updates (3)

• 5058405
• 5058411
• 5061258

Acknowledgments

Vladimir Lagunov with <a href="https://jetbrains.com/">JetBrains</a>

Revision History

• 2025-05-13: Information published.
• 2025-05-16: To comprehensively address CVE-2025-29971, Microsoft has released HotPatch KB5061258 for Windows 11 Version 24H2 for x64-based Systems and Windows 11 Version 24H2 for ARM64-based Systems. Customers running these versions of Windows and who install the HotPatch updates should install KB5061258 to be protected from this vulnerability.