CVE Watch—

CVE-2026-21525

Microsoft Windows NULL Pointer Dereference Vulnerability

CVSS

—

No CVSS

EPSS

5.0%

p91

KEV

YES

Feb 10, 2026

Exploit Today

0-100

Published: — · Last modified: —

EPSS · 30d

5.0%EPSS · 30 days5.0%

2026-06-302026-07-17

KEV catalog record

Product

Microsoft / Windows

Vulnerability

Microsoft Windows NULL Pointer Dereference Vulnerability

Added to KEV

Feb 10, 2026

Remediate by

Mar 3, 2026

Known ransomware use

Summary description

Microsoft Windows Remote Access Connection Manager contains a NULL pointer dereference that could allow an unauthorized attacker to deny service locally.

Required action

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

Notes

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21525 ; https://nvd.nist.gov/vuln/detail/CVE-2026-21525

Related CVEs

CVECVSSEPSSKEVRExploitTitleMod.

CVE-2025-59287—

100.0%

KEV—80Microsoft Windows Server Update Service (WSUS) Deserialization of Untrusted Data Vulnerability—CVE-2021-34527—

100.0%

KEV—80Microsoft Windows Print Spooler Remote Code Execution Vulnerability—CVE-2023-36884—

99.9%

KEV—80Microsoft Windows Search Remote Code Execution Vulnerability—CVE-2022-30190—

99.9%

KEV—80Microsoft Windows Support Diagnostic Tool (MSDT) Remote Code Execution Vulnerability—CVE-2008-4250—

99.9%

KEV—80Microsoft Windows Buffer Overflow Vulnerability—CVE-2024-21412—

99.9%

KEV—80Microsoft Windows Internet Shortcut Files Security Feature Bypass Vulnerability—