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Microsoft Patches MSMQ Flaw That Affects IIS Web Servers

Microsoft has issued an out-of-band security update to resolve a critical vulnerability affecting the Message Queuing (MSMQ) feature in Windows 10 systems. This update is pertinent to systems operating IIS web servers and enterprise environments.

EBy Eric WallaceDec 19, 20251 min read

Microsoft has issued an out-of-band security update to resolve a critical vulnerability affecting the Message Queuing (MSMQ) feature in Windows 10 systems. This update is pertinent to systems operating IIS web servers and enterprise environments.

The vulnerability, identified in the December 9, 2025 update (KB5071546), impacts Windows 10 version 22H2 and version 21H2. It causes significant disruptions in MSMQ operations, particularly within clustered environments under heavy loads.

Affected organizations have reported issues such as inactive message queues, resource allocation errors, and the inability of applications to write to message queues. These problems manifest as error messages indicating insufficient disk space or memory, despite available resources.

The MSMQ service's failure to generate new messages leads to application and service interruptions, particularly in enterprise settings where MSMQ is critical for managing large volumes of messages across distributed systems.

Microsoft has issued an out-of-band security update to resolve a critical vulnerability affecting the Message Queuing (MSMQ) feature in Windows 10 systems.
Eric Wallace · Thehackingpost

It is important to note that Windows Home and Pro edition users with personal devices are unlikely to encounter this issue. The vulnerability primarily concerns enterprise deployments where MSMQ is integral to application messaging and queue management.

The out-of-band patch corrects MSMQ functionality issues experienced post the December 9, 2025 updates. System administrators are advised to apply KB5015684 to upgrade to Windows 10 version 22H2, which includes the MSMQ fix and other quality improvements.

Users with prior updates will automatically receive only new updates included in this package. Microsoft is actively monitoring for further MSMQ-related issues and provides updated guidance via the Windows release health dashboard.

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For detailed security information, administrators should refer to the Security Update Guide and the December 2025 Security Updates available on Microsoft's official channels.

Based on reporting by GBHackers.

AI transparency. This article was produced with the assistance of artificial intelligence and published under human editorial oversight. AI systems can make mistakes. Read how we use AI (EU AI Act, Art. 50).
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