CVE-2025-21333
Confirmed PUBLISHEDWindows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability
Recommended Action
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
At a Glance
Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability
- CVE Published
- Jan 14, 2025
- Exploitation Reported
- Jan 14, 2025
- CVSS
- 7.8 High
- EPSS
- 9.8%
Affected Versions
| Vendor | Product | Version | Status |
|---|---|---|---|
| Microsoft |
Windows 10 Version 21H2
|
10.0.19044.0 to < 10.0.19044.5371 |
Affected |
| Microsoft |
Windows 10 Version 22H2
|
10.0.19045.0 to < 10.0.19045.5371 |
Affected |
| Microsoft |
Windows 11 version 22H2
|
10.0.22621.0 to < 10.0.22621.4751 |
Affected |
| Microsoft |
Windows 11 version 22H3
|
10.0.22631.0 to < 10.0.22631.4751 |
Affected |
| Microsoft |
Windows 11 Version 23H2
|
10.0.22631.0 to < 10.0.22631.4751 |
Affected |
| Microsoft |
Windows 11 Version 24H2
|
10.0.26100.0 to < 10.0.26100.2894 |
Affected |
| Microsoft |
Windows Server 2022, 23H2 Edition (Server Core installation)
|
10.0.25398.0 to < 10.0.25398.1369 |
Affected |
| Microsoft |
Windows Server 2025
|
10.0.26100.0 to < 10.0.26100.2894 |
Affected |
| Microsoft |
Windows Server 2025 (Server Core installation)
|
10.0.26100.0 to < 10.0.26100.2894 |
Affected |
CVE References
- Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability msrc.microsoft.com · Vendor Advisory https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21333
Recommended Actions
- Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
- Check enrichment artifacts for scanner coverage and available PoCs before rolling remediation validation.
- Use the Pro API to automate enrichment, telemetry, and workflow delivery for VM, SOC, and CTI pipelines.
Known Exploited Vulnerability Sources
Catalogues that list this CVE as a known exploited vulnerability.
Per-source evidence links for KEV attestations are available through the KEVIntel Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| CISA First | 2025-01-14 00:00 UTC |
| CVE | 2026-06-09 18:50 UTC |
No detection artifacts or sensor request patterns are available for this CVE yet.
Check back as sensor telemetry and scanner integrations are updated.
Virtual Patch
Compensating WAF rules to help reduce exposure to this CVE. Rule content and deployable vendor exports are available with KEVIntel Enterprise.
KEVIntel does not currently have a virtual patch for this CVE. When available, KEVIntel virtual patches ship as deployable ModSecurity, Cloudflare, and AWS WAF rules.
Enterprise feature. Virtual patch rule content and deployable vendor exports (ModSecurity, Cloudflare, AWS WAF) are available to KEVIntel Enterprise users.
CVSS Scores
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Exploitation Status
Exploited in the wild
Recorded 2025-01-14 00:00:00 UTC · CISA
Proof of concept available
Recorded 2025-03-11 17:32:07 UTC · GitHub
Weaknesses (CWE)
-
Heap-based Buffer Overflow
Scanner Integrations
| Scanner | Reference | Detected |
|---|---|---|
| Nessus | https://www.tenable.com/plugins/nessus/214136 | Jun 02, 2025 |
Potential Proof of Concepts
These PoCs are unverified and could contain malware. Use at your own risk.
github · Created 2025-03-11 17:32:07 UTC · 0 stars
KQL para deteccion de CVE-2025-21333 en Sentinel
github · Created 2025-02-27 12:36:55 UTC · 186 stars
POC exploit for CVE-2025-21333 heap-based buffer overflow. It leverages WNF state data and I/O ring IOP_MC_BUFFER_ENTRY
Timeline
Key exploitation, disclosure, scanner coverage, and KEV attestation events for this CVE.
-
18:50 UTC about 1 month ago18:50 UTC · about 1 month ago
KEV confirmed by CVE
Exploitation attested by an external source
-
09:25 UTC about 1 year ago09:25 UTC · about 1 year ago
Nessus plugin available
Scanner coverage available
-
12:36 UTC over 1 year ago12:36 UTC · over 1 year ago
Public PoC available
Public proof-of-concept code published
-
18:04 UTC over 1 year ago18:04 UTC · over 1 year ago
CVE published
Vulnerability disclosed publicly
-
00:00 UTC over 1 year ago00:00 UTC · over 1 year ago
Added to CISA KEV
Listed in the CISA Known Exploited Vulnerabilities catalog
-
00:29 UTC over 1 year ago00:29 UTC · over 1 year ago
CVE ID reserved
Identifier reserved by the CNA
Automate This Intelligence with the Pro API
Confidence scoring, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
Pro API Example
GET /api/v2/pro/kevs/CVE-2025-21333
{
"cve_id": "CVE-2025-21333",
"title": "Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability",
"affected_vendor": "Microsoft",
"affected_product": "Windows 10 Version 21H2, Windows 10 Version 22H2, Windows 11 version 22H2, Windows 11 version 22H3, Windows 11 Version 23H2, Windows 11 Version 24H2, Windows Server 2022, 23H2 Edition (Server Core installation), Windows Server 2025, Windows Server 2025 (Server Core installation)",
"affected_versions": [
{ "vendor": "...", "product": "...", "status": "affected", "display_label": "..." }
],
"confidence": "Confirmed",
"cvss_score": 7.8,
"epss_score": 0.09798,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "...": "Pro API fields" },
"proof_of_concepts": [ "..." ],
"scanner_integrations": [ "..." ]
}