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CVE-2025-21276

Target: Windows - MapUrlToZone

Microsoft CVSS 7.5 Updated March 8, 2026
Threat Level HIGH

Executive Risk Summary

"A denial of service vulnerability exists in Windows MapUrlToZone, which could allow an attacker to cause a denial of service condition. This vulnerability can be exploited by sending a specially crafted request to the affected system."

Operational Audit Arsenal

Target Type System
Target Asset Windows
Standard Path Network
PowerShell
# 🛠️ Senior Engineer Universal Audit
# Target: Windows (System)
$Target = "Windows"
$SearchPaths = @("$env:windir\System32", "$env:ProgramFiles", "${env:ProgramFiles(x86)}")

Get-ChildItem -Path $SearchPaths -Filter $Target -Recurse -ErrorAction SilentlyContinue | 
Select-Object FullName, @{Name="Version";Expression={$_.VersionInfo.ProductVersion}}

Patch Impact Forecast

Reboot Required Required
Service Disruption

Low to Moderate

Internal Work Notes

Apply the latest security updates from Microsoft to mitigate this vulnerability, as referenced in the MSRC update guide.

Intelligence Sources

Scope of Impact

Windows 10 1507 Windows 11 23H2 Windows Server 2012 Windows Server 2022 23H2 Windows Server 2016 Windows Server 2019 Windows Server 2012 (Version r2) Windows 11 24H2 Windows Server 2025 Windows Server 2008 Windows 10 21H2 Windows 10 22H2 Windows Server 2008 (Version r2) Windows Server 2022 Windows 11 22H2 Windows 10 1607 Windows 10 1809

Original NVD Description

"Windows MapUrlToZone Denial of Service Vulnerability"

Data compiled from NVD, MSRC, and CISA KEV Catalog. Intelligence synthesized via AI. Scripts provided for diagnostic purposes under MIT License.