Local service crash via null pointer dereference
Published Feb 10, 2026 · Updated Feb 10, 2026
Null pointer dereference in Microsoft Windows Remote Access Connection Manager allows local users to crash the service without authentication. Microsoft has not disclosed the affected function, input path, or operation that permits attacker-controlled input to reach a null pointer. Local execution is required; the reported consequence is an availability-only interruption of remote-access and VPN connections.
Summary
What happened
Null pointer dereference in Microsoft Windows Remote Access Connection Manager allows local users to crash the service without authentication. Microsoft has not disclosed the affected function, input path, or operation that permits attacker-controlled input to reach a null pointer. Local execution is required; the reported consequence is an availability-only interruption of remote-access and VPN connections.
The record
- CVE
- CVE-2026-21525
- Published
- Feb 10, 2026
- Updated
- Feb 10, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-476, T1499
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 10, 2026Exploitation reportedCISA Known Exploited Vulnerabilities catalog entry
- Feb 10, 2026CVE publishedPublication date reported by the CVE source.
- Feb 10, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=10.0.17763.0 <10.0.17763.8389
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Reported exploitation
- CISA Known Exploited Vulnerabilities catalog entryknown exploited catalog
Technologies
Your stack
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Your stack
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