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CVE-2025-21201

Windows - Telephony Server

Microsoft CVSS 8.8 Updated March 10, 2026

Executive Risk Summary

"A remote code execution vulnerability exists in the Windows Telephony Server, allowing attackers to execute arbitrary code on the affected system. This vulnerability poses a significant risk to systems that have the Telephony Server component enabled, as it could be exploited to gain unauthorized access and control."

Operational Audit Arsenal

Target Type Executable
Target Asset tapisrv.dll
Standard Path %windir%\System32
PowerShell
# 🛠️ Senior Engineer Universal Audit
# Target: tapisrv.dll (Executable)
$Targets = 'tapisrv.dll'
$SearchPaths = @("$env:windir\System32", "$env:ProgramFiles", "${env:ProgramFiles(x86)}")

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

Patch Impact Forecast

Reboot Required Likely

Telephony services may be affected

Internal Work Notes

Apply security update to mitigate remote code execution vulnerability in Windows Telephony Server

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