CVE-2026-21525 KEV
6.2
MEDIUM · CVSS 3.1 · EPSS 4.8% (pctl 92)
Patch first
On CISA KEV — known exploited in the wild, due 2026-03-03.
Description
Null pointer dereference in Windows Remote Access Connection Manager allows an unauthorized attacker to deny service locally.
Scoring
| CVSS | 6.2 (MEDIUM, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| EPSS | 4.8% — more likely to be exploited than 92% of all CVEs |
| Weakness | CWE-476 |
| On CISA KEV | yes — remediate by 2026-03-03 |
| Public exploit | none known |
| Published | 2026-02-10 |
| Last modified | 2026-06-17 |
CISA KEV
| Name | Microsoft Windows NULL Pointer Dereference Vulnerability |
|---|---|
| Added | 2026-02-10 |
| Due | 2026-03-03 |
| Vendor / product | Microsoft / Windows |
| Ransomware use | none reported |
Affected (13)
| Vendor | Product |
|---|---|
| microsoft | windows 10 1607 |
| microsoft | windows 10 1809 |
| microsoft | windows 10 21h2 |
| microsoft | windows 10 22h2 |
| microsoft | windows 11 23h2 |
| microsoft | windows 11 24h2 |
| microsoft | windows 11 25h2 |
| microsoft | windows server 2012 |
| microsoft | windows server 2016 |
| microsoft | windows server 2019 |
| microsoft | windows server 2022 |
| microsoft | windows server 2022 23h2 |
| microsoft | windows server 2025 |
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21525
- https://www.vicarius.io/vsociety/posts/cve-2026-21525-detection-script-dos-vulnerability-in-windows-remote-access-connection-manager
- https://www.vicarius.io/vsociety/posts/cve-2026-21525-mitigation-script-dos-vulnerability-in-windows-remote-access-connection-manager
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21525
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