Java OpenWire Protocol Remote Code Execution
Actively exploited in the wild. Patch or mitigate immediately — don't wait for a maintenance window.
An unauthenticated attacker, remotely over the network, with no user interaction, can tamper with data and take the system offline.
The Java OpenWire protocol marshaller is vulnerable to Remote Code Execution. This vulnerability may allow a remote attacker with network access to either a Java-based OpenWire broker or client to run arbitrary shell commands by manipulating serialized class types in the OpenWire protocol to cause either the client or the broker (respectively) to instantiate any class on the classpath. Users are recommended to upgrade both brokers and clients to version 5.15.16, 5.16.7, 5.17.6, or 5.18.3 which fixes this issue.
Techniques marked “observed” are corroborated by threat intelligence; the rest are inferred from the weakness type (CWE) and attack vector.
Corroborated threat activity referencing this CVE — with source and confidence, not inference.
Groups documented using the techniques observed against this CVE — a tradecraft association, not a confirmed attribution. Overlap count shown; click for the MITRE profile.
These techniques were analysed against this CVE's real-world exploitation — the matching entries in the ATT&CK chain above are marked “observed”.
Generated by Wavense from the CVE record — an immediate mitigation and the permanent fix.
Immediately restrict network access to OpenWire ports and services through firewall rules and network segmentation, allowing communication only from trusted sources. Implement robust network intrusion detection systems to monitor for anomalous traffic patterns or suspicious OpenWire protocol interactions. Consider temporarily disabling OpenWire services on non-critical systems if immediate patching is not feasible.
The permanent fix requires upgrading both OpenWire brokers and clients to patched versions. Users should upgrade to Apache ActiveMQ versions 5.15.16, 5.16.7, 5.17.6, or 5.18.3. These specific versions address the deserialization vulnerability in the Java OpenWire protocol marshaller.
A remote attacker with network access can execute arbitrary shell commands on affected Java-based OpenWire brokers or clients. This allows for full system compromise, leading to data exfiltration, service disruption, or lateral movement within the compromised environment. The critical severity means successful exploitation poses a severe risk to business operations and data integrity.
Other CVEs affecting activemq
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Path Equivalence: 'file.Name' (Internal Dot) leading to Remote Code Execution and/or Information disclosure and/or malicious content added to uploaded files via write enabled Default Servlet in Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.2, from 10.1.0-M1 through 10.1.34, from 9.0.0.M1 through 9.0.98. The following versions were EOL at the time the CVE was created but are known to be affected: 8.5.0 though 8.5.100. Other, older, EOL versions may also be affected. If all of the following were true, a malicious user was able to view security sensitive files and/or inject content into those files: - writes enabled for the default servlet (disabled by default) - support for partial PUT (enabled by default) - a target URL for security sensitive uploads that was a sub-directory of a target URL for public uploads - attacker knowledge of the names of security sensitive files being uploaded - the security sensitive files also being uploaded via partial PUT If all of the following were true, a malicious user was able to perform remote code execution: - writes enabled for the default servlet (disabled by default) - support for partial PUT (enabled by default) - application was using Tomcat's file based session persistence with the default storage location - application included a library that may be leveraged in a deserialization attack Users are recommended to upgrade to version 11.0.3, 10.1.35 or 9.0.99, which fixes the issue.
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