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EPSS 5.0%top 8.2%

CVE-2026-21525: CWE-476: NULL Pointer Dereference in Microsoft Windows 10 Version 1607

0
Medium
VulnerabilityCVE-2026-21525cvecve-2026-21525cwe-476gcve
Published: 02/10/2026 (02/10/2026, 17:51:34 UTC)
Source: CVE Database V5
Vendor/Project: Microsoft
Product: Windows 10 Version 1607

Description

Null pointer dereference in Windows Remote Access Connection Manager allows an unauthorized attacker to deny service locally.

CVSS v3.1

Score 6.2medium

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C

Affected software

Microsoft

Windows 10 Version 1607

Affected versions
>=10.0.14393.0 <10.0.14393.8868

Microsoft

Windows 10 Version 1809

Affected versions
>=10.0.17763.0 <10.0.17763.8389

Microsoft

Windows 10 Version 21H2

Affected versions
>=10.0.19044.0 <10.0.19044.6937

Microsoft

Windows 10 Version 22H2

Affected versions
>=10.0.19045.0 <10.0.19045.6937

Microsoft

Windows 11 version 22H3

Affected versions
>=10.0.22631.0 <10.0.22631.6649

Microsoft

Windows 11 Version 23H2

Affected versions
>=10.0.22631.0 <10.0.22631.6649

Microsoft

Windows 11 Version 24H2

Affected versions
>=10.0.26100.0 <10.0.26100.7840

Microsoft

Windows 11 Version 25H2

Affected versions
>=10.0.26200.0 <10.0.26200.7840

Microsoft

Windows 11 version 26H1

Affected versions
>=10.0.28000.0 <10.0.28000.1575

Microsoft

Windows 11 Version 26H1

Affected versions
>=10.0.28000.0 <10.0.28000.1575

Microsoft

Windows Server 2012

Affected versions
>=6.2.9200.0 <6.2.9200.25923

Microsoft

Windows Server 2012 (Server Core installation)

Affected versions
>=6.2.9200.0 <6.2.9200.25923

Microsoft

Windows Server 2012 R2

Affected versions
>=6.3.9600.0 <6.3.9600.23022

Microsoft

Windows Server 2012 R2 (Server Core installation)

Affected versions
>=6.3.9600.0 <6.3.9600.23022

Microsoft

Windows Server 2016

Affected versions
>=10.0.14393.0 <10.0.14393.8868

Microsoft

Windows Server 2016 (Server Core installation)

Affected versions
>=10.0.14393.0 <10.0.14393.8868

Microsoft

Windows Server 2019

Affected versions
>=10.0.17763.0 <10.0.17763.8389

Microsoft

Windows Server 2019 (Server Core installation)

Affected versions
>=10.0.17763.0 <10.0.17763.8389

Microsoft

Windows Server 2022

Affected versions
>=10.0.20348.0 <10.0.20348.4773

Microsoft

Windows Server 2022, 23H2 Edition (Server Core installation)

Affected versions
>=10.0.25398.0 <10.0.25398.2149

Microsoft

Windows Server 2025

Affected versions
>=10.0.26100.0 <10.0.26100.32370

Microsoft

Windows Server 2025 (Server Core installation)

Affected versions
>=10.0.26100.0 <10.0.26100.32370

AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 05/12/2026, 05:15:30 UTC

Technical Analysis

This vulnerability (CVE-2026-21525) involves a null pointer dereference (CWE-476) in the Windows Remote Access Connection Manager component of Windows 10 Version 1607 (build 10.0.14393.0). An unauthorized attacker with local access can exploit this flaw to cause a denial of service condition by crashing the service. The CVSS v3.1 base score is 6.2 (medium severity), reflecting local attack vector, low complexity, no privileges required, no user interaction, and impact limited to availability. Microsoft has released an official fix for this vulnerability.

Potential Impact

Successful exploitation results in denial of service by crashing the Windows Remote Access Connection Manager service, affecting system availability. There is no impact on confidentiality or integrity. The vulnerability requires local access and no privileges, making it a local denial of service vector.

Mitigation Recommendations

An official fix is available from Microsoft. Users and administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21525 to remediate this vulnerability.

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Technical Details

Data Version
5.2
Assigner Short Name
microsoft
Date Reserved
2025-12-30T18:10:54.846Z
Cvss Version
3.1
State
PUBLISHED
Remediation Level
official-fix
Vendor Advisory Urls
[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21525","vendor":"Microsoft"}]

Threat ID: 698b76064b57a58fa120a6a1

Added to database: 02/10/2026, 18:16:38 UTC

Last enriched: 05/12/2026, 05:15:30 UTC

Last updated: 09/10/2026, 22:11:40 UTC

Views: 315

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