CVE-2026-21525 (GCVE-0-2026-21525)
Vulnerability from cvelistv5 – Published: 2026-02-10 17:51 – Updated: 2026-02-17 22:55
VLAI?
CISA KEV
Title
Windows Remote Access Connection Manager Denial of Service Vulnerability
Summary
Null pointer dereference in Windows Remote Access Connection Manager allows an unauthorized attacker to deny service locally.
Severity ?
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
| URL | Tags | ||||
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Impacted products
| Vendor | Product | Version | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Microsoft | Windows 10 Version 1607 |
Affected:
10.0.14393.0 , < 10.0.14393.8868
(custom)
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CISA KEV
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 4e06bbbb-377e-41da-9408-fe5df1dc658a
Exploited: Yes
Timestamps
First Seen: 2026-02-10
Asserted: 2026-02-10
Scope
Notes: KEV entry: Microsoft Windows NULL Pointer Dereference Vulnerability | Affected: Microsoft / Windows | 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. | Due date: 2026-03-03 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21525 ; https://nvd.nist.gov/vuln/detail/CVE-2026-21525
Evidence
Type: Vendor Report
Signal: Successful Exploitation
Confidence: 80%
Source: cisa-kev
Details
| Cwes | CWE-476 |
|---|---|
| Feed | CISA Known Exploited Vulnerabilities Catalog |
| Product | Windows |
| Due Date | 2026-03-03 |
| Date Added | 2026-02-10 |
| Vendorproject | Microsoft |
| Vulnerabilityname | Microsoft Windows NULL Pointer Dereference Vulnerability |
| Knownransomwarecampaignuse | Unknown |
References
Created: 2026-02-11 06:19 UTC
| Updated: 2026-02-11 06:19 UTC
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"cveMetadata": "{\"cveId\": \"CVE-2026-21525\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-02-17T22:55:47.679Z\", \"dateReserved\": \"2025-12-30T18:10:54.846Z\", \"assignerOrgId\": \"f38d906d-7342-40ea-92c1-6c4a2c6478c8\", \"datePublished\": \"2026-02-10T17:51:34.755Z\", \"assignerShortName\": \"microsoft\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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