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Vulnerabilities / CVE-2026-21525

CVE-2026-21525

Published 2026-02-10 · Analyzed

CVE-2026-21525

Microsoft Windows NULL Pointer Dereference Vulnerability

Exploited in the wild: CISA added it to the Known Exploited Vulnerabilities catalog on 2026-02-10, with a fix-by date of 2026-03-03. Patch it first.

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

6.2 MEDIUM
CVSS 3.1 · CNA · microsoft.com
4.9%
chance of exploitation in the next 30 days (EPSS; higher than 92% of CVEs)

Null pointer dereference in Windows Remote Access Connection Manager allows an unauthorized attacker to deny service locally.

Scores

6.2CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HCNA · microsoft.com
6.2CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:CCNA

Affected products

  • microsoft windows 10 1607: < 10.0.14393.8868
  • microsoft windows 10 1809: < 10.0.17763.8389
  • microsoft windows 10 21h2: < 10.0.19044.6937
  • microsoft windows 10 22h2: < 10.0.19045.6937
  • microsoft windows 11 23h2: < 10.0.22631.6649
  • microsoft windows 11 24h2: < 10.0.26100.7781
  • microsoft windows 11 25h2: < 10.0.26200.7781
  • microsoft windows server 2012: all versions; r2
  • microsoft windows server 2016: < 10.0.14393.8868
  • microsoft windows server 2019: < 10.0.17763.8389
  • microsoft windows server 2022: < 10.0.20348.4711
  • microsoft windows server 2022 23h2: < 10.0.25398.2149
  • microsoft windows server 2025: < 10.0.26100.32313

Weakness: CWE-476

4 references (advisories, patches, write-ups)

Sources: NVD, CVE.org, FIRST EPSS. Missing ones did not answer or have no record yet.

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