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CISA KEV · ACTIVELY EXPLOITED
HIGH severity

CVE-2025-59230 — Windows 10 21h2

HIGH

CVE-2025-59230 is a high-severity (CVSS 7.8) CWE-284 vulnerability in microsoft windows 10 21h2. It is in CISA's Known Exploited Vulnerabilities catalog (added 2025-10-14) — treat it as actively exploited and patch now. A fix is available — see the affected versions and patch details below.

Improper access control in Windows Remote Access Connection Manager allows an authorized attacker to elevate privileges locally.

Published
Updated
Affected
16 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 2025-10-14. Federal agencies were required to remediate by 2025-11-04.
  • 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-2025-59230.

EPSS Exploitation Probability

via FIRST.org ↗
2.7%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs86th percentile — riskier than 86% of all scored CVEsHighest risk
1.87%3.14%4.41%5.69%3.7%2.7%Apr 26Aug 26Oct 26

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

How urgent is this, really

CVE-2025-59230 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 394,415 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Description

Improper access control in Windows Remote Access Connection Manager allows an authorized attacker to elevate privileges locally.

Affected Products

16 products · 22 configurations
OS
windows 10 21h2microsoft
< 10.0.19044.6456
range
OS
windows 10 22h2microsoft
< 10.0.19045.6456
range
OS
windows 10 1507microsoft
< 10.0.10240.21161
range
OS
windows 10 1607microsoft
< 10.0.14393.8519
range
OS
windows 10 1809microsoft
< 10.0.17763.7919
range
OS
windows 11 22h2microsoft
< 10.0.22621.6060
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-2025-59230 on the affected version, following the vendor advisory for your exact build.

  3. Workarounds

    Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.

Frequently Asked Questions

Improper access control in Windows Remote Access Connection Manager allows an authorized attacker to elevate privileges locally.
O3 Security · Runtime Protection

Is CVE-2025-59230 being exploited in your environment?

Detect and block the exploit chain at execution, on systems you cannot patch yet.

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CVE-2025-59230: Windows 10 21h2 (High 7.8, KEV)