CVE-2026-21525
KEVMicrosoft Windows NULL Pointer Dereference Vulnerability
Description
Microsoft Windows Remote Access Connection Manager contains a NULL pointer dereference that could allow an unauthorized attacker to deny service locally.
Null pointer dereference in Windows Remote Access Connection Manager allows an unauthorized attacker to deny service locally.
CVSS 3.1 vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HPublishedFeb 10, 2026
Last modifiedJun 17, 2026
Added to KEVFeb 10, 2026
Remediation dueMar 3, 2026
References
- msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21525Vendor Advisory
- vicarius.io/vsociety/posts/cve-2026-21525-detection-script-dos-vulnerability-in-windows-remote-access-connection-managerThird Party Advisory
- vicarius.io/vsociety/posts/cve-2026-21525-mitigation-script-dos-vulnerability-in-windows-remote-access-connection-managerMitigationThird Party Advisory
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21525US Government Resource
0 recent articles mention this CVE
61
Risk assessment · High
Actively exploited. Patch immediately.
- Exploitation
- Confirmed in the wild (CISA KEV)
- Federal remediation deadline
- Overdue by 237 days
- CVSS
- 6.2 MEDIUM
- EPSS (30-day exploit probability)
- 4.9% · top 8% of all CVEs
- Weakness
- CWE-476
- Preconditions
- No privileges and no user interaction
Recommended actions
- 1.Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- 2.Treat as emergency change: patch or isolate internet-facing instances first.
- 3.Hunt for compromise: review logs for the disclosure window, not just from the patch date.
Assessment is derived automatically from the live signals above; verify against your own asset inventory.