CVE-2026-21525

Description

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

Overview

State: PUBLISHED
Assigner (CNA): microsoft
CVSS severity: MEDIUM
CVSS score: 6.2 / 10
CVSS vector: 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
Effective score: 6.2 / 10 MEDIUM source: CNA overview
MSRC score: 6.2 / 10 MEDIUM MS rating: Moderate · Denial of Service
CWE(s): CWE-476
Reserved: 2025-12-30
Published: 2026-02-10 08:00 UTC
Last updated: 2026-02-10 08:00 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/21xxx/CVE-2026-21525.json

CISA Known Exploited Vulnerabilities CISA KEV

CISA has confirmed in-the-wild exploitation of this CVE. Federal agencies must remediate by the due date below; private orgs should treat it as priority-1.

Vulnerability name: Microsoft Windows NULL Pointer Dereference Vulnerability
Vendor / project: Microsoft
Product: Windows
Date added to KEV: 2026-02-10
Remediation due: 2026-03-03
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.
Ransomware campaign use: Unknown
CISA notes: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21525 ; https://nvd.nist.gov/vuln/detail/CVE-2026-21525
CISA listing: www.cisa.gov/known-exploited-vulnerabilities-catalog

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published: 2026-02-10 18:16:34 UTC
NVD last modified: 2026-03-30 13:28:00 UTC
NVD CVSS v3.1: 6.2 / 10 MEDIUM source: secure@microsoft.com
NVD CVSS vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Exploitability subscore: 2.5 / 10
Impact subscore: 3.6 / 10
EPSS score: 0.0886 (probability of exploitation in next 30 days)
EPSS percentile: 92.65% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-7329
Assigner: microsoft
Published: Feb 10, 2026, 5:51:34 PM
Updated: May 11, 2026, 9:25:35 PM
EUVD base score (CVSS 3.1): 6.2 / 10
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
EUVD-reported EPSS: 8.8600
Vendors: Microsoft
Products: Windows Server 2025 (10.0.26100.0 <10.0.26100.32370)

Windows 10 Version 22H2 (10.0.19045.0 <10.0.19045.6937)

Windows 11 Version 24H2 (10.0.26100.0 <10.0.26100.7840)

Windows Server 2016 (Server Core installation) (10.0.14393.0 <10.0.14393.8868)

Windows Server 2019 (10.0.17763.0 <10.0.17763.8389)

Windows Server 2012 R2 (6.3.9600.0 <6.3.9600.23022)

Windows 11 Version 25H2 (10.0.26200.0 <10.0.26200.7840)

Windows Server 2025 (Server Core installation) (10.0.26100.0 <10.0.26100.32370)

Windows 10 Version 1607 (10.0.14393.0 <10.0.14393.8868)

Windows 11 Version 23H2 (10.0.22631.0 <10.0.22631.6649)

Windows 10 Version 21H2 (10.0.19044.0 <10.0.19044.6937)

Windows 10 Version 1809 (10.0.17763.0 <10.0.17763.8389)

Windows 11 version 26H1 (10.0.28000.0 <10.0.28000.1575)

Windows Server 2022, 23H2 Edition (Server Core installation) (10.0.25398.0 <10.0.25398.2149)

Windows Server 2022, 23H2 Edition (Server Core installation) (10.0.25398.0 <10.0.25398.2149)

Windows Server 2012 R2 (Server Core installation) (6.3.9600.0 <6.3.9600.23022)

Windows Server 2019 (10.0.17763.0 <10.0.17763.8389)

Windows Server 2012 R2 (Server Core installation) (6.3.9600.0 <6.3.9600.23022)

Windows Server 2025 (Server Core installation) (10.0.26100.0 <10.0.26100.32370)

Windows 11 version 26H1 (10.0.28000.0 <10.0.28000.1575)

Windows 10 Version 1607 (10.0.14393.0 <10.0.14393.8868)

Windows Server 2012 (Server Core installation) (6.2.9200.0 <6.2.9200.25923)

Windows Server 2012 R2 (6.3.9600.0 <6.3.9600.23022)

Windows 11 Version 25H2 (10.0.26200.0 <10.0.26200.7840)

Windows 11 version 26H1 (10.0.28000.0 <10.0.28000.1575)

Windows Server 2016 (10.0.14393.0 <10.0.14393.8868)

Windows Server 2019 (Server Core installation) (10.0.17763.0 <10.0.17763.8389)

Windows 11 version 22H3 (10.0.22631.0 <10.0.22631.6649)

Windows 11 Version 23H2 (10.0.22631.0 <10.0.22631.6649)

Windows Server 2025 (10.0.26100.0 <10.0.26100.32370)

Windows Server 2022 (10.0.20348.0 <10.0.20348.4773)

Windows Server 2016 (10.0.14393.0 <10.0.14393.8868)

Windows Server 2012 (Server Core installation) (6.2.9200.0 <6.2.9200.25923)

Windows 10 Version 21H2 (10.0.19044.0 <10.0.19044.6937)

Windows Server 2012 (6.2.9200.0 <6.2.9200.25923)

Windows 10 Version 1809 (10.0.17763.0 <10.0.17763.8389)

Windows Server 2012 (6.2.9200.0 <6.2.9200.25923)

Windows 11 version 22H3 (10.0.22631.0 <10.0.22631.6649)

Windows Server 2016 (Server Core installation) (10.0.14393.0 <10.0.14393.8868)

Windows 10 Version 22H2 (10.0.19045.0 <10.0.19045.6937)

Windows Server 2022 (10.0.20348.0 <10.0.20348.4773)

Windows 11 Version 24H2 (10.0.26100.0 <10.0.26100.7840)

Windows Server 2019 (Server Core installation) (10.0.17763.0 <10.0.17763.8389)
Aliases: GHSA-cf8p-vhmm-h7g6

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

EUVD references (1)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21525

Microsoft Security Response Center MSRC

Microsoft's vendor-authoritative record from the Security Update Guide — its own CVSS score, impact, severity rating, exploit assessment, and KB-article fixes. Refreshed 2026-07-15 03:05 UTC (source: CVRF).

MS severity: Moderate
Impact: Denial of Service
MS CVSS base score: 6.2 / 10 (temporal 5.4)
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
Exploit assessment: Publicly Disclosed:No;Exploited:Yes;Latest Software Release:Exploitation Detected
Release: 2026-Feb

Microsoft remediations / KB articles (28)

5075904 — Vendor Fix / Security Update (fixed build 10.0.17763.8389)
https://support.microsoft.com/help/5075904 — None Available / 5075904
5075906 — Vendor Fix / Security Update (fixed build 10.0.20348.4773)
https://support.microsoft.com/help/5075906 — None Available / 5075906
5075943 — Vendor Fix / Security Hotpatch Update (fixed build 10.0.20348.4711)
https://support.microsoft.com/help/5075943 — None Available / 5075943
5075912 — Vendor Fix / Security Update (fixed build 10.0.19044.6937)
https://support.microsoft.com/help/5075912 — None Available / 5075912
5075899 — Vendor Fix / Security Update (fixed build 10.0.26100.32370)
https://support.microsoft.com/help/5075899 — None Available / 5075899
5075942 — Vendor Fix / Security Hotpatch Update (fixed build 10.0.26100.32313)
https://support.microsoft.com/help/5075942 — None Available / 5075942
5077181 — Vendor Fix / Security Update (fixed build 10.0.26200.7840)
https://support.microsoft.com/help/5077181 — None Available / 5077181
5077212 — Vendor Fix / Security Hotpatch Update (fixed build 10.0.26200.7781)
https://support.microsoft.com/help/5077212 — None Available / 5077212
5075941 — Vendor Fix / Security Update (fixed build 10.0.22631.6649)
https://support.microsoft.com/help/5075941 — None Available / 5075941
5075897 — Vendor Fix / Security Update (fixed build 10.0.25398.2149)
https://support.microsoft.com/help/5075897 — None Available / 5075897
5075999 — Vendor Fix / Security Update (fixed build 10.0.14393.8868)
https://support.microsoft.com/help/5075999 — None Available / 5075999
5075971 — Vendor Fix / Monthly Rollup (fixed build 6.2.9200.25923)
https://support.microsoft.com/help/5075971 — None Available / 5075971
5075970 — Vendor Fix / Monthly Rollup (fixed build 6.3.9600.23022)
https://support.microsoft.com/help/5075970 — None Available / 5075970
5077179 — Vendor Fix / Security Update (fixed build 10.0.28000.1575)
https://support.microsoft.com/help/5077179 — None Available / 5077179

Affected products (22)

Vendor	Product	Versions	Platforms
Microsoft	Windows 10 Version 1607	`10.0.14393.0` (affected)	32-bit Systems, x64-based Systems
Microsoft	Windows 10 Version 1809	`10.0.17763.0` (affected)	32-bit Systems, x64-based Systems
Microsoft	Windows 10 Version 21H2	`10.0.19044.0` (affected)	32-bit Systems, ARM64-based Systems, x64-based Systems
Microsoft	Windows 10 Version 22H2	`10.0.19045.0` (affected)	32-bit Systems, ARM64-based Systems, x64-based Systems
Microsoft	Windows 11 version 22H3	`10.0.22631.0` (affected)	ARM64-based Systems
Microsoft	Windows 11 Version 23H2	`10.0.22631.0` (affected)	x64-based Systems
Microsoft	Windows 11 Version 24H2	`10.0.26100.0` (affected)	ARM64-based Systems, x64-based Systems
Microsoft	Windows 11 Version 25H2	`10.0.26200.0` (affected)	—
Microsoft	Windows 11 version 26H1	`10.0.28000.0` (affected)	ARM64-based Systems
Microsoft	Windows 11 Version 26H1	`10.0.28000.0` (affected)	—
Microsoft	Windows Server 2012	`6.2.9200.0` (affected)	x64-based Systems
Microsoft	Windows Server 2012 (Server Core installation)	`6.2.9200.0` (affected)	x64-based Systems
Microsoft	Windows Server 2012 R2	`6.3.9600.0` (affected)	x64-based Systems
Microsoft	Windows Server 2012 R2 (Server Core installation)	`6.3.9600.0` (affected)	x64-based Systems
Microsoft	Windows Server 2016	`10.0.14393.0` (affected)	x64-based Systems
Microsoft	Windows Server 2016 (Server Core installation)	`10.0.14393.0` (affected)	x64-based Systems
Microsoft	Windows Server 2019	`10.0.17763.0` (affected)	x64-based Systems
Microsoft	Windows Server 2019 (Server Core installation)	`10.0.17763.0` (affected)	x64-based Systems
Microsoft	Windows Server 2022	`10.0.20348.0` (affected)	x64-based Systems
Microsoft	Windows Server 2022, 23H2 Edition (Server Core installation)	`10.0.25398.0` (affected)	x64-based Systems
Microsoft	Windows Server 2025	`10.0.26100.0` (affected)	x64-based Systems
Microsoft	Windows Server 2025 (Server Core installation)	`10.0.26100.0` (affected)	x64-based Systems

Affected products — CPE 2.3 (23) NVD

NVD's normalized CPE 2.3 matchers, used by vendor tools (vulnerability scanners, asset managers) for automated detection. Compare with the CNA's free-text "Affected products" section above.

cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*

Vendor references (1)

References embedded in the original CVE record by the assigning CNA.

Windows Remote Access Connection Manager Denial of Service Vulnerability vendor-advisorypatch

Web references (29)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

NVD-tagged references (4)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21525 secure@microsoft.com Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21525 134c704f-9b21-4f2e-91b3-4a467353bcc0 US Government Resource
https://www.vicarius.io/vsociety/posts/cve-2026-21525-detection-script-dos-vulnerability-in-windows-remote-access-connection-manager af854a3a-2127-422b-91ae-364da2661108 Third Party Advisory
https://www.vicarius.io/vsociety/posts/cve-2026-21525-mitigation-script-dos-vulnerability-in-windows-remote-access-connection-manager af854a3a-2127-422b-91ae-364da2661108 MitigationThird Party Advisory

Remediations (10)

Microsoft Patch Tuesday March 2026 - 78 Vulnerabilities Fixed ...

web:cybersecuritynews.com

Microsoft released its March 2026 Patch Tuesday security update on March 10, 2026 , addressing 78 vulnerabilities across Windows, Microsoft Office, Azure, SQL Server, and .NET. The update includes one actively exploited zero-day vulnerability and multiple Critical-rated flaws demanding immediate attention from security teams. The most urgent fix this month is CVE - 2026 -21262, the sole zero-day ...

2026-05-23 21:42 UTC
Patch Tuesday, February 2026 Edition - Krebs on Security

web:krebsonsecurity.com

The sixth zero-day is CVE-2026-21525 , a potentially disruptive denial-of-service vulnerability in the Windows Remote Access Connection Manager, the service responsible for maintaining VPN ...

2026-05-23 21:42 UTC
NVD - cve-2026-21525

web:nvd.nist.gov

This is a potential security issue, you are being redirected to https://nvd.nist.gov

2026-05-23 21:42 UTC
Security Update Guide - Microsoft

web:portal.msrc.microsoft.com

The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.

2026-05-23 21:42 UTC
Microsoft fixes six zero-days on February 2026 Patch Tuesday

web:www.csoonline.com

Microsoft highlighted six new and actively exploited vulnerabilities among the 60 fixes issued in today's February Patch Tuesday releases.

2026-05-23 21:42 UTC
May 2026 Microsoft Patch Tuesday: Critical Security Updates, Secure ...

web:www.dbtsupport.com

The May 2026 Microsoft Patch Tuesday release includes security updates across supported Microsoft products and should be reviewed directly in the Microsoft Security Update Guide for the final CVE list, affected products, severity ratings, exploitability assessments, and any revised guidance.

2026-05-23 21:42 UTC
Oracle Critical Patch Update Advisory - April 2026

web:www.oracle.com

This Critical Patch Update contains 481 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at April 2026 Critical Patch Update: Executive Summary and Analysis.

2026-05-23 21:42 UTC
CVE-2026-21525: Windows 10 1607 DOS Vulnerability - SentinelOne

web:www.sentinelone.com

CVE-2026-21525 is a denial of service vulnerability in Windows 10 1607. Learn about its impact, affected versions, and mitigation methods.

2026-05-23 21:42 UTC
Microsoft Issues Massive Windows Patch for 160+ Bugs ... - TechRepublic

web:www.techrepublic.com

Microsoft's April 2026 Patch Tuesday fixes 165 vulnerabilities, including two zero-days, in one of the company's largest monthly security updates.

2026-05-23 21:42 UTC
Patch Tuesday May 2026: Security Updates & CVE Analysis

web:zecurit.com

Get the complete breakdown of Microsoft's May 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .

2026-05-23 21:42 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-21525.json.

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