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CVE-2025-21307

Windows - Reliable Multicast Transport Driver

Microsoft CVSS 9.8 Updated March 10, 2026

Executive Risk Summary

"A remote code execution vulnerability exists in the Windows Reliable Multicast Transport Driver, which could allow an attacker to execute arbitrary code on a vulnerable system. This vulnerability can be exploited by sending a specially crafted packet to a vulnerable system, potentially leading to a complete system compromise."

Operational Audit Arsenal

Target Type Driver
Target Asset rmcast.sys
Standard Path %windir%\System32\drivers
PowerShell
# 🛠️ Senior Engineer Universal Audit
# Target: rmcast.sys (Driver)
$Targets = 'rmcast.sys'
$SearchPaths = @("$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

Network services may be affected

Internal Work Notes

Apply latest Windows security updates to mitigate Remote Code Execution vulnerability in Reliable Multicast Transport Driver

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Intelligence Sources

Related Microsoft Threats

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