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CVE-2025-21302

Windows - Telephony Service

Microsoft CVSS 8.8 Updated March 8, 2026

Executive Risk Summary

"A remote code execution vulnerability exists in the Windows Telephony Service, which could allow an attacker to execute arbitrary code on a vulnerable system. This vulnerability is considered critical and requires immediate attention to prevent potential exploitation."

Operational Audit Arsenal

Target Type Service
Target Asset tapisrv
Standard Path %windir%\System32
PowerShell
# 🛠️ Senior Engineer Universal Audit
# Target: tapisrv (Service)
$Targets = 'tapisrv'
$SearchPaths = @("$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 Windows Telephony Service RCE vulnerability (CVE-2025-21302)

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Intelligence Sources

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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.