CVE-2025-29971
HighWeb Threat Defense (WTD.sys) Denial of Service Vulnerability
Published May 13, 2025 · Updated Feb 13, 2026
Key Facts
Patch immediately- CVE-2025-29971 is a high-severity vulnerability (CVSS 7.5 v3.1) affecting Windows 11 22h2 (Microsoft), Windows 11 23h2 (Microsoft), Windows 11 24h2 (Microsoft) and 4 more products.
- It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
- EPSS estimates a 67% probability of exploitation in the next 30 days.
- Fixed versions are available, including Windows 11 22h2 10.0.22621.5335, Windows 11 23h2 10.0.22631.5335, Windows 11 24h2 10.0.26100.4061.
- Brandefense priority: patch immediately, because it is very likely to be exploited soon.
CVSS v3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS (30-day exploit likelihood)
67%
Higher than 99.2% of all scored CVEs
Exploited in the wild
No known
Not in a known-exploited catalog
Public exploit code
None known
Get the full CVE-2025-29971 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
Out-of-bounds read in Web Threat Defense (WTD.sys) allows an unauthorized attacker to deny service over a network.
Affected Products
10 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Windows 11 22h2Microsoft | See advisory | 10.0.22621.5335 |
| Windows 11 23h2Microsoft | See advisory | 10.0.22631.5335 |
| Windows 11 24h2Microsoft | See advisory | 10.0.26100.4061 |
| Windows 11 version 22H2 | >= 10.0.22621.0 | 10.0.22621.5335 |
| Windows 11 version 22H3 | >= 10.0.22631.0 | 10.0.22631.5335 |
Patched Releases
Windows 11 22h2
10.0.22621.5335
Windows 11 23h2
10.0.22631.5335
Windows 11 24h2
10.0.26100.4061
Windows 11 version 22H2
10.0.22621.5335
Windows 11 version 22H3
10.0.22631.5335
Windows 11 Version 23H2
10.0.22631.5335
Windows 11 Version 24H2
10.0.26100.4061
Timeline
Publicly disclosed
May 13, 2025
Last updated
Feb 13, 2026
Weakness Type
- CWE-125 Out-of-bounds Read
References
FAQ
Common Questions.
Out-of-bounds read in Web Threat Defense (WTD.sys) allows an unauthorized attacker to deny service over a network.
Affected: Windows 11 22h2 (Microsoft); Windows 11 23h2 (Microsoft); Windows 11 24h2 (Microsoft), among others. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including Windows 11 22h2 10.0.22621.5335, Windows 11 23h2 10.0.22631.5335, Windows 11 24h2 10.0.26100.4061.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.
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