Is CVE-2025-21391 in the CISA KEV catalog?

Yes. CVE-2025-21391 is on the CISA Known Exploited Vulnerabilities list, added 2025-02-11.

What is the CVSS severity of CVE-2025-21391?

CVE-2025-21391 has a CVSS v3 base score of 7.1 (HIGH).

What is the EPSS score for CVE-2025-21391?

CVE-2025-21391 has an EPSS score of 2.14% (80th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-2025-21391

HIGHCISA KEVEPSS 80th pctl

7.1

CVSS v3

NVD

Description

Windows Storage Elevation of Privilege Vulnerability

CWE-59

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

2.14%probability of exploitation in 30 days

80thpercentile

Elevated risk: more likely to be exploited than 80% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Microsoft Windows Storage Link Following Vulnerability

Microsoft Windows Storage contains a link following vulnerability that could allow for privilege escalation. This vulnerability could allow an attacker to delete data including data that results in the service being unavailable.

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

Remediation due: 2025-03-04

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.