7.8
High
CVE-2025-21335 Microsoft Windows Hyper-V NT Kernel Integration VSP Use-After-Free Vulnerability
Active exploitation observed
· CISA KEV catalogue
Required action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Ransomware campaigns
Not observed so far
Weakness
CWE-416
Description
Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Windows 10 Version 21H2 10.0 | 10.0.19044.0 → < 10.0.19044.5371 | 10.0.19044.5371 |
| Windows 11 version 22H2 10.0 | 10.0.22621.0 → < 10.0.22621.4751 | 10.0.22621.4751 |
| Windows 10 Version 22H2 10.0 | 10.0.19045.0 → < 10.0.19045.5371 | 10.0.19045.5371 |
| Windows Server 2025 (Server Core installation) 10.0 | 10.0.26100.0 → < 10.0.26100.2894 | 10.0.26100.2894 |
| Windows 11 version 22H3 10.0 | 10.0.22631.0 → < 10.0.22631.4751 | 10.0.22631.4751 |
| Windows 11 Version 23H2 10.0 | 10.0.22631.0 → < 10.0.22631.4751 | 10.0.22631.4751 |
| Windows Server 2022, 23H2 Edition (Server Core installation) 10.0 | 10.0.25398.0 → < 10.0.25398.1369 | 10.0.25398.1369 |
| Windows 11 Version 24H2 10.0 | 10.0.26100.0 → < 10.0.26100.2894 | 10.0.26100.2894 |
| Windows Server 2025 10.0 | 10.0.26100.0 → < 10.0.26100.2894 | 10.0.26100.2894 |
Other CVEs of Windows 10 Version 21H2
The 4539 CVEs of Windows 10 Version 21H2 →
CVE-2026-108136
Use after free in Microsoft Windows Search Component allows an authorized attacker to elevate privileges locally
7.8
High
CVE-2026-108135
Improper link resolution before file access ('link following') in Windows Backup Engine allows an authorized attacker to…
7.0
High
CVE-2026-108131
No cwe for this issue in Active Directory Federation Services (AD FS) allows an unauthorized attacker to perform…
7.5
High
CVE-2026-108129
Out-of-bounds read in DNS Server allows an authorized attacker to disclose information over a network
6.5
Medium