Multiple privilege escalation vulnerabilities in Microsoft Windows Hyper-V NT Kernel Integration VSP
| Risk | High |
| Patch available | YES |
| Number of vulnerabilities | 3 |
| CVE-ID | CVE-2025-21333 CVE-2025-21334 CVE-2025-21335 |
| CWE-ID | CWE-122 CWE-416 |
| Exploitation vector | Local |
| Public exploit |
Vulnerability #1 is being exploited in the wild. Vulnerability #2 is being exploited in the wild. Vulnerability #3 is being exploited in the wild. |
| Vulnerable software |
Windows Operating systems & Components / Operating system Windows Server Operating systems & Components / Operating system |
| Vendor | Microsoft |
Security Bulletin
This security bulletin contains information about 3 vulnerabilities.
1) Heap-based buffer overflow
EUVDB-ID: #VU102617
Risk: High
CVSSv4.0: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Amber]
CVE-ID: CVE-2025-21333
CWE-ID:
CWE-122 - Heap-based Buffer Overflow
Exploit availability: Yes
DescriptionThe vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a boundary error in Windows Hyper-V NT Kernel Integration VSP component. A local user can trigger a heap-based buffer overflow and execute arbitrary code with SYSTEM privileges.
Note, the vulnerability is being actively exploited in the wild. MitigationInstall updates from vendor's website.
Vulnerable software versionsWindows: 10 21H2 10.0.19041.3920 - 11 24H2 10.0.26100.2894
Windows Server: 2016 10.0.14393.10 - 2025 10.0.26100.2605
CPE2.3- cpe:2.3:o:microsoft:windows:10_21H2:10.0.19044.5247:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows:10_22H2:10.0.19045.5247:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows:11_22H2:10.0.22621.4602:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows:11_23H2:10.0.22631.4602:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows:11_24H2:10.0.26100.2894:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_server:2016:10.0.14393.7699:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_server:2022_23H2:10.0.25398.1308:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_server:2025:10.0.26100.2605:*:*:*:*:*:*
http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2025-21333
Q & A
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
Is there known malware, which exploits this vulnerability?
Yes. This vulnerability is being exploited in the wild.
2) Use-after-free
EUVDB-ID: #VU102616
Risk: High
CVSSv4.0: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Amber]
CVE-ID: CVE-2025-21334
CWE-ID:
CWE-416 - Use After Free
Exploit availability: No
DescriptionThe vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error in Windows Hyper-V NT Kernel Integration VSP component. A local user can execute arbitrary code with SYSTEM privileges.
Note, the vulnerability is being actively exploited in the wild. MitigationInstall updates from vendor's website.
Vulnerable software versionsWindows: 10 21H2 10.0.19041.3920 - 11 24H2 10.0.26100.2894
Windows Server: 2016 10.0.14393.10 - 2025 10.0.26100.2605
CPE2.3http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2025-21334
Q & A
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
Is there known malware, which exploits this vulnerability?
Yes. This vulnerability is being exploited in the wild.
3) Use-after-free
EUVDB-ID: #VU102615
Risk: High
CVSSv4.0: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Amber]
CVE-ID: CVE-2025-21335
CWE-ID:
CWE-416 - Use After Free
Exploit availability: No
DescriptionThe vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error in Windows Hyper-V NT Kernel Integration VSP component. A local user can execute arbitrary code with SYSTEM privileges.
Note, the vulnerability is being actively exploited in the wild.
Install updates from vendor's website.
Vulnerable software versionsWindows: 10 21H2 10.0.19041.3920 - 11 24H2 10.0.26100.2894
Windows Server: 2016 10.0.14393.10 - 2025 10.0.26100.2605
CPE2.3http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2025-21335
Q & A
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
Is there known malware, which exploits this vulnerability?
Yes. This vulnerability is being exploited in the wild.
