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CVE-2025-21205

Windows - Telephony Service

Microsoft CVSS 8.8 Updated March 12, 2026

Executive Risk Summary

"A heap-based buffer overflow vulnerability in the Windows Telephony Service allows an unauthorized attacker to execute code over a network, potentially leading to a full system compromise. This vulnerability poses a significant risk to Windows systems, as it can be exploited remotely without requiring any user interaction."

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 Service

Internal Work Notes

CVE-2025-21205: Windows Telephony Service vulnerability allowing remote code execution, requiring immediate patching to prevent potential system compromise.

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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.