CVE-2025-21335
high CISA KEVMicrosoft Windows Hyper-V NT Kernel Integration VSP Use-After-Free Vulnerability
Vendor / product: Microsoft — Windows
Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability
CVSS
7.8
7.8 (CVSS v3.1)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Severity source: NVD CVSS v3.1 (secure@microsoft.com)
Timeline (UTC)
Published: 2025-01-14 18:15
Modified: 2026-09-24 13:10
NVD status: Analyzed
Last synced 2 days ago
Verified against the source API 2026-10-27 07:07 UTC
Exploitation
Listed in CISA KEV
Added 2025-01-14 · due 2025-02-04
Known ransomware use: Unknown
Required action (CISA)
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Affected products
microsoft / windows_10_21h2 <10.0.19044.5371
microsoft / windows_10_22h2 <10.0.19045.5371
microsoft / windows_11_22h2 <10.0.22621.4751
microsoft / windows_11_23h2 <10.0.22631.4751
microsoft / windows_11_24h2 <10.0.26100.2894
microsoft / windows_server_2022_23h2 <10.0.25398.1369
microsoft / windows_server_2025 <10.0.26100.2894
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21335
Patch / mitigation: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21335
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21335 secure@microsoft.com
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-21335 134c704f-9b21-4f2e-91b3-4a467353bcc0
Data sources
CISA KEV — fetched 2026-10-27 06:50 UTC · record ↗
NVD CVE API 2.0 — fetched 2026-10-27 07:07 UTC · record ↗