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

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 68.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-05-13 · updated 2026-06-17
• Weakness: CWE-125

Description

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

Affected products

• Microsoft Windows 11: before 10.0.22621.5335 — fixed in 10.0.22621.5335
• Microsoft Windows 11: before 10.0.22631.5335 — fixed in 10.0.22631.5335
• Microsoft Windows 11: before 10.0.26100.4061 — fixed in 10.0.26100.4061
• Microsoft Windows 11: from 10.0.22621.0 before 10.0.22621.5335 — fixed in 10.0.22621.5335
• Microsoft Windows 11 version 22H3: from 10.0.22631.0 before 10.0.22631.5335 — fixed in 10.0.22631.5335
• Microsoft Windows 11: from 10.0.22631.0 before 10.0.22631.5335 — fixed in 10.0.22631.5335
• Microsoft Windows 11: from 10.0.26100.0 before 10.0.26100.4061 — fixed in 10.0.26100.4061

How to fix

Upgrade to a fixed version: Microsoft Windows 11 10.0.22621.5335; Microsoft Windows 11 10.0.22631.5335; Microsoft Windows 11 10.0.26100.4061; Microsoft Windows 11 10.0.22621.5335; Microsoft Windows 11 version 22H3 10.0.22631.5335; Microsoft Windows 11 10.0.22631.5335; Microsoft Windows 11 10.0.26100.4061. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-29971

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