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Critical Apache ActiveMQ Vulnerability Let Attackers Execute Arbitrary Code

The Apache Software Foundation has identified a critical vulnerability in its ActiveMQ NMS AMQP Client, which could enable attackers to execute arbitrary code on susceptible systems.

JBy Jonathan PierceOct 16, 20251 min read

The Apache Software Foundation has identified a critical vulnerability in its ActiveMQ NMS AMQP Client, which could enable attackers to execute arbitrary code on susceptible systems.

Designated as CVE-2025-54539, this deserialization issue poses a significant threat to applications using the client for messaging over AMQP protocols.

The vulnerability was publicly disclosed in an advisory on Wed, Oct 15, 2025, with recommendations for immediate upgrades to avert potential exploits.

The flaw arises from improper handling of untrusted data during connections to AMQP servers. In versions up to and including 2.3.0, the client engages in unbounded deserialization logic, which can be exploited by malicious servers.

Through specially crafted responses, attackers could initiate remote code execution on the client side, potentially affecting entire networks or applications.

Designated as CVE-2025-54539, this deserialization issue poses a significant threat to applications using the client for messaging over AMQP protocols.
Jonathan Pierce · Thehackingpost

Efforts to secure the client were initiated with version 2.1.0, introducing allow and deny lists to restrict deserialization. However, these measures can be bypassed under certain conditions, exposing users to the full extent of the vulnerability.

Microsoft's deprecation of binary serialization in .NET 9 reflects an industry trend towards safer options like JSON or Protocol Buffers, which reduce the risk of deserialization-based exploits.

To mitigate CVE-2025-54539, Apache advises upgrading to version 2.4.0 or later, where deserialization logic has been strengthened against these attacks.

For projects dependent on .NET binary serialization, transitioning to modern formats is recommended as a security measure.

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Organizations utilizing ActiveMQ in distributed systems, such as financial services or IoT infrastructures, should prioritize patching to prevent lateral movement by threat actors.

Discovered by Endor Labs' Security Research Team, this vulnerability emphasizes the importance of meticulous third-party dependency management.

With a CVSS score indicating significant severity, unpatched instances could lead to ransomware attacks or data breaches. Developers are urged to evaluate their supply chains and test connections to external AMQP brokers to ensure no untrusted endpoints can manipulate client behavior.

Based on reporting by Cyber Security News.

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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