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CISA KEV · ACTIVELY EXPLOITED
HIGH severity

CVE-2025-32701 — Windows 10 21h2

HIGH

CVE-2025-32701 is a high-severity (CVSS 7.8) Use After Free vulnerability in microsoft windows 10 21h2. It is in CISA's Known Exploited Vulnerabilities catalog (added 2025-05-13) — treat it as actively exploited and patch now. A fix is available — see the affected versions and patch details below.

Use after free in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally.

Published
Updated
Affected
15 products
Patched
See advisory
Exploits
None indexed
Exploitation data as of Oct 23, 2026 · OSV.dev, NVD, CISA KEV, FIRST.org (EPSS)

Exploitation Status

Actively exploited in the wild

  • Confirmed by CISA's Known Exploited Vulnerabilities catalog on 2025-05-13. Federal agencies were required to remediate by 2025-06-03.
  • A successful exploit gives an attacker total control of the affected component, not partial access.

Exploitation and automatability from CISA (KEV catalog and SSVC triage) for CVE-2025-32701.

EPSS Exploitation Probability

via FIRST.org ↗
1.4%probability of exploitation in next 30 days
Lower Risk+0.02%
Lower risk than most CVEs73th percentile — riskier than 73% of all scored CVEsHighest risk
0.79%1.39%1.99%2.58%2.1%1.4%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2025-32701 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 395,249 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Description

Use after free in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally.

Affected Products

15 products · 18 configurations
OS
windows 10 21h2microsoft
< 10.0.19044.5854
range
OS
windows 10 22h2microsoft
< 10.0.19045.5854
range
OS
windows 10 1507microsoft
< 10.0.10240.21014
range
OS
windows 10 1607microsoft
< 10.0.14393.8066
range
OS
windows 10 1809microsoft
< 10.0.17763.7314
range
OS
windows 11 22h2microsoft
< 10.0.22621.5335
range

Detection & mitigation playbook

Vendor / appliance

  1. Detect

    Inventory every microsoft windows 10 21h2 deployment and check each version against the affected-products list above.

  2. Fix

    Apply the microsoft windows 10 21h2 security patch or hotfix for CVE-2025-32701 on the affected version, following the vendor advisory for your exact build.

  3. Workarounds

    Constrain what reaches the vulnerable code: limit the size and shape of untrusted input, isolate the affected component in a sandboxed or least-privileged process, and enable the platform's memory-safety mitigations (ASLR, stack protector, hardened allocator) so an out-of-bounds access is more likely to fail closed than to be exploitable. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.

Frequently Asked Questions

Use after free in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally.
O3 Security · Runtime Protection

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CVE-2025-32701: Windows 10 21h2 Use After Free (KEV)