CVE-2025-21335
Exploited in the wild. In CISA KEV since 2025‑01‑14. Fixed versions are out.
What to do
Find your product and version, then upgrade to the build on the right.
- Microsoft Windows 10 Version 21H2Affected: ≥ 10.0.19044.0, < 10.0.19044.5371Upgrade to: 10.0.19044.5371Affected: ≥ 10.0.19045.0, < 10.0.19045.5371Upgrade to: 10.0.19045.5371Stated by: CVE record
- Microsoft Windows 11 version 22H2Affected: ≥ 10.0.22621.0, < 10.0.22621.4751Upgrade to: 10.0.22621.4751Affected: ≥ 10.0.22631.0, < 10.0.22631.4751Upgrade to: 10.0.22631.4751Affected: ≥ 10.0.26100.0, < 10.0.26100.2894Upgrade to: 10.0.26100.2894Stated by: CVE record
- Microsoft Windows Server 2022, 23H2 EditionAffected: ≥ 10.0.25398.0, < 10.0.25398.1369Upgrade to: 10.0.25398.1369Stated by: CVE record
- Microsoft Windows Server 2025Affected: ≥ 10.0.26100.0, < 10.0.26100.2894Upgrade to: 10.0.26100.2894Stated by: CVE record
Versions as the sources state them. Full version matrix after sign-in
Coverage timeline
0 publishersAdded to CISA KEV catalog
Sourced from public security reporting — each date is when it was published, not when it happened. 1 further article named this CVE in wider roundups without reporting it as a distinct event.
What it is
From the CVE record
Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability
In plain language
No plain-language summary for this CVE yet.
Exploitation
Where each signal puts this CVE on the scale from published to confirmed exploited.
- CISA KEV
Listed as exploited in the wild since 2025-01-14.
US federal agencies must remediate by 2025-02-04.
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- Public exploits
No public exploit or proof of concept found in the sources we track.
- EPSS
1.4% chance of exploitation activity in the next 30 days, which ranks it in the 72nd percentile of scored CVEs.
Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.
- Attention now
Sustained.
Lifecycle
9 events over 618 days, from the signal feeds we watch.
- Patch availablerecord updated
- OpenVAS check added
- Patch availablerecord updated
- Added to CISA KEVpublished, weakness classified, att&ck mapped
Affected products
And 20 more affected products. See all after sign-in
Technical detail
CVSS 3.1 vector
Open in the CVSS calculatorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Scored 7.8 by NVD.
How it is reached
- Attack Vector LocalRequires local access to the vulnerable system (e.g. local login, malicious file)
- Attack Complexity LowNo special conditions — the attack can be reliably reproduced
- Privileges Required LowRequires basic user-level privileges
- User Interaction NoneNo user interaction needed — fully automated exploitation
Scope
- Scope UnchangedImpact is limited to the vulnerable component itself
Impact if exploited
- Confidentiality HighTotal information disclosure — all data in the component is compromised
- Integrity HighTotal loss of integrity — attacker can modify any data in the component
- Availability HighTotal denial of service — the component is completely unavailable
Weaknesses
ATT&CK techniques
Mapped from the weaknesses above (CWE to ATT&CK), not observed in attacks.
- Initial AccessT1190Exploit Public-Facing Applicationhigh confidence
- Privilege EscalationT1068Exploitation for Privilege Escalationhigh confidence
Sources
Watch the software you run.
My Stack ranks new CVEs for your products by real-world exploitation, so the next exploited one reaches you without reading every advisory.
We'll flag the next CVE, public exploit or patch for Windows 10 Version 21H2, not every advisory. This one: actively exploited.
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- The full version matrix and every affected product
- Exploit links, proofs of concept and Metasploit modules
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