Is CVE-2025-21335 in the CISA KEV catalog?

Yes. CVE-2025-21335 is on the CISA Known Exploited Vulnerabilities list, added 2025-01-14.

What is the CVSS severity of CVE-2025-21335?

CVE-2025-21335 has a CVSS v3 base score of 7.8 (HIGH).

What is the EPSS score for CVE-2025-21335?

CVE-2025-21335 has an EPSS score of 1.36% (68th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-2025-21335

HIGHCISA KEV

7.8

CVSS v3

NVD

Description

Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability

CWE-416Use After Free

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

1.36%probability of exploitation in 30 days

68thpercentile

Moderate risk: more likely to be exploited than 68% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Microsoft Windows Hyper-V NT Kernel Integration VSP Use-After-Free Vulnerability

Microsoft Windows Hyper-V NT Kernel Integration VSP contains a use-after-free vulnerability that allows a local attacker to gain SYSTEM privileges.

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Remediation due: 2025-02-04

References

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-10-27.