Patch

CVE-2025-21307

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Vulnerability Overview

CVE Name

CVE-2025-21307

Severity

9.8

Critical

CVE Description

Windows Reliable Multicast Transport Driver (RMCAST) Remote Code Execution Vulnerability

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Latest Patch info

There is no patch available at the moment, but you can use our script.

Patch Name

secure@microsoft.com

Date

14.01.2025

Script

Script Type

Remediation script

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❗ CVE-2025-21307 is a critical remote code execution (RCE) vulnerability in the Windows Reliable Multicast Transport Driver (RMCAST), which supports the Pragmatic General Multicast (PGM) protocol. This flaw allows unauthenticated attackers to send specially crafted packets to systems with an open PGM socket, enabling them to execute arbitrary code on affected systems. Systems with the Microsoft Message Queuing (MSMQ) service enabled are particularly at risk. Exploitation requires no prior authentication or user interaction, potentially resulting in data breaches, unauthorized system control, and further network compromise. ℹ️ This mitigation script disables the MSMQ service to protect the system from exploitation: Check MSMQ Feature Status: Uses Get-WindowsOptionalFeature to verify if the MSMQ feature is installed and enabled. If the feature is not installed, the script confirms no action is required. Stop and Disable MSMQ Service: Uses Stop-Service to halt the MSMQ service if it is running. Uses Set-Service to set the MSMQ service startup type to Disabled, preventing it from starting automatically. Confirm Mitigation: Outputs a success message if the MSMQ service is stopped and disabled. Provides error details if the mitigation fails. ✅ Running this mitigation script ensures that the MSMQ service is disabled, reducing the risk of exploitation by CVE-2025-21307.

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# Disable MSMQ service to mitigate CVE-2025-21307
try {
    # Check if MSMQ feature is installed
    $msmqFeature = Get-WindowsOptionalFeature -Online -FeatureName MSMQ-Server -ErrorAction Stop

if ($msmqFeature.State -ne "Enabled") {
        Write-Host "MSMQ feature is NOT INSTALLED or not enabled on this system. No action may be required." -ForegroundColor Green
    } else {
        # Check if the MSMQ service exists
        $service = Get-Service -Name MSMQ -ErrorAction Stop

# Stop the service if running
        if ($service.Status -eq 'Running') {
            Stop-Service -Name MSMQ -Force -ErrorAction Stop
            Write-Host "MSMQ service stopped successfully." -ForegroundColor Green
        }

# Disable the service permanently
        Set-Service -Name MSMQ -StartupType Disabled -ErrorAction Stop
        Write-Host "MSMQ service startup set to DISABLED." -ForegroundColor Green
        Write-Host "Mitigation applied. No restart required." -ForegroundColor Green
    }
} catch {
    Write-Host "Error: Mitigation failed. Details: $($_.Exception.Message)" -ForegroundColor Red
}

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Affected OS & Apps

Windows Server 2025

Microsoft

Windows 11 24H2

Microsoft

Windows Server 2022 23H2

Microsoft

4.8

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