CVE-2026-21525
MEDIUM CISA KEV Actively ExploitedWindows Remote Access Connection Manager Denial of Service Vulnerability
CVSS v3
6.2
MEDIUM
EPSS Score
9.4%
exploit probability
CISA KEV
Yes
known exploited
Exploitation
active
SSVC status
Description
Null pointer dereference in Windows Remote Access Connection Manager allows an unauthorized attacker to deny service locally.
CISA Known Exploited Vulnerability
- Date Added
- 2/10/2026
- Patch Due Date
- 3/3/2026
- 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.
Technical Details
- CVSS v3 Vector
- 3.1
- Published
- 2/10/2026
- Last Modified
- 3/30/2026
Frequently Asked Questions
What is CVE-2026-21525?
Null pointer dereference in Windows Remote Access Connection Manager allows an unauthorized attacker to deny service locally.
Is CVE-2026-21525 actively exploited?
Yes. CVE-2026-21525 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 3/3/2026.
What is the CVSS score for CVE-2026-21525?
CVE-2026-21525 has a CVSS v3 base score of 6.2 (MEDIUM severity), with vector string 3.1.
Is CVE-2026-21525 affecting your environment?
Use isMalicious to check if any of your IPs or domains are associated with this vulnerability's IOCs.