External risk intelligence

Microsoft MSMQ Remote Code Execution Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2024-30080

Microsoft Message Queuing (MSMQ) is a Windows service used for internal application communication and message processing. While it uses network protocols, it is designed for backend service-to-service interaction within internal networks. It is rarely intended to be exposed directly to the public internet, and such exposure would typically be considered an unusual or misconfigured deployment.

Use After Free

Microsoft Windows 10 1507

before 10.0.10240.20680before 10.0.14393.7070before 10.0.17763.5936before 10.0.19043.4529before 10.0.22000.3019before 10.0.22621.3737before 10.0.22631.3737r2before 10.0.20348.2522;...

Halo Surface Signal: 2 out of 5 — less likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A critical vulnerability has been identified in Microsoft Message Queuing (MSMQ), a core Windows component. This issue allows for remote code execution, meaning an attacker could potentially control affected systems without any user interaction. The broad impact across multiple Windows versions necessitates an understanding of its potential implications for our environment.

MSMQ allows remote code execution.
Criticality requires awareness of potential exposure.
Confirm relevance and assess potential exposure.

Attack Path

How an attacker could exploit the issue

An attacker could compromise a system by sending a specially crafted message to a vulnerable Microsoft Message Queuing (MSMQ) service. This service is designed to handle application messaging, and if exposed to an attacker, it can be manipulated to execute malicious code. The vulnerability allows for remote code execution, potentially leading to a full system takeover.

No authentication required to access.
Malicious message sent to MSMQ service.
Remote code execution and system compromise.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability could allow an unauthenticated attacker to execute arbitrary code on affected systems when Microsoft Message Queuing (MSMQ) is exposed to the network. This could impact system integrity and availability if an attacker successfully exploits this flaw.

System integrity and availability.
Network exposure of MSMQ service.
Arbitrary code execution on the system.

Operational Fix

Recommended remediation, mitigation, and detection steps

Real-World Ownership

Given the nature of Microsoft Message Queuing (MSMQ) as a Windows service often used for internal application communication, ownership for addressing this vulnerability likely falls to infrastructure or platform teams responsible for managing Windows servers and their core services. The first critical step is to identify all instances of MSMQ within your environment, determine their network exposure, and confirm their business criticality. This will allow you to prioritize remediation efforts and engage the appropriate accountable owner for the affected systems.

Infrastructure or Platform Teams own resolution.
Verify MSMQ network exposure and criticality.
Plan coordinated patching or risk mitigation.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

Free EASM Trial See How Signal Works

Frequently asked questions

What is Microsoft Message Queuing (MSMQ) used for?

MSMQ is a Windows component that acts as a message broker for internal applications. It enables reliable communication between programs by allowing them to send, receive, and store messages in queues, even if the applications are not running at the same time. It is a fundamental service for background processing and server-to-server data exchange across many versions of Windows client and server operating systems.

What is the vulnerability class for CVE-2024-30080?

This vulnerability is classified as CWE-416, which is a Use-After-Free weakness. In simple terms, this means the software continues to use a memory location after it has been cleared or released. If manipulated correctly, this flaw allows an attacker to influence the program's memory state, potentially leading to remote code execution where they can run their own unauthorized commands on the system.

How does an attacker trigger this MSMQ vulnerability?

An attacker triggers this flaw by sending a specially crafted, malicious message to the Microsoft Message Queuing service over the network. Because the vulnerability exists in how the service processes these messages, the attacker does not need to authenticate or interact with a user. Note that simply having the MSMQ service installed is not enough; the service must be reachable by the attacker over the network to process the malicious input.

Why should I be concerned about CVE-2024-30080?

Halo Surface Signal notes that MSMQ is intended for internal application communication and is rarely meant to be exposed to the public internet. If your systems are misconfigured and expose the MSMQ service to the internet, they are at much higher risk of remote exploitation. You should care because this is a critical vulnerability that, if exploited, could grant an attacker complete control over the affected Windows host.

What are the first steps to address this CVE?

Your first step is to perform an inventory of your environment to identify where the MSMQ service is installed and enabled. Once identified, verify whether those services are accessible from untrusted or public networks. After mapping the exposure, coordinate with your infrastructure or platform teams to plan and apply the necessary security updates to patch the affected Windows systems.

References

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.