How severe is CVE-2025-21325?

CVE-2025-21325 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-21325 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-21325?

CVE-2025-21325 primarily affects Microsoft Windows 10 21h2. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-21325?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-21325 have an EU (EUVD) identifier?

Yes. CVE-2025-21325 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-2390.

When was CVE-2025-21325 published?

CVE-2025-21325 was published on 2025-01-17 and last updated on 2026-06-17.

CVE-2025-21325

CVE-2025-21325 is a high-severity vulnerability in Microsoft Windows 10 21h2 with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-732.

Key facts

Severity: High (CVSS 3.x base score 7.8)
EPSS exploit prediction: 0% (35th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-2390
Weakness: CWE-732
Affected product: Microsoft Windows 10 21h2
Published: 2025-01-17
Last modified: 2026-06-17

Description

Windows Secure Kernel Mode Elevation of Privilege Vulnerability

Frequently asked questions

What is CVE-2025-21325?: Windows Secure Kernel Mode Elevation of Privilege Vulnerability
How severe is CVE-2025-21325?: CVE-2025-21325 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-21325 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-21325?: CVE-2025-21325 primarily affects Microsoft Windows 10 21h2. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-21325?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-21325 have an EU (EUVD) identifier?: Yes. CVE-2025-21325 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-2390.
When was CVE-2025-21325 published?: CVE-2025-21325 was published on 2025-01-17 and last updated on 2026-06-17.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21325

Affected products (6)

cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_11_22h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*

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