Integer overflow in ActiveMQ - CVE-2025-66168

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Main Vulnerability Database Vulnerabilities #VU123488

Integer overflow in ActiveMQ - CVE-2025-66168

Published: March 4, 2026 / Updated: April 10, 2026


Vulnerability identifier: #VU123488
CSH Severity: Medium
CVSS v4: 6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-66168
CWE-ID: CWE-190
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote user to perform a denial of service attack.

The vulnerability exists due to integer overflow within the MQTT module when decoding malformed packets. A remote user can send specially crafted packets to the application, trigger an integer overflow and perform a denial of service attack. Note, the vulnerability does not affect brokers with not enabled MQTT transport connectors.


Affected software

ActiveMQ
IBM Sterling Control Center
IBM Qradar SIEM
openEuler
activemq-javadoc
activemq

How to mitigate CVE-2025-66168

Install updates from vendor's website.

ActiveMQ - update to 5.19.2
IBM Sterling Control Center - addressed in versions 6.3.1.0.8, 6.4.1.0.2, 6.4.2.0.3
IBM Qradar SIEM - update to 7.5.0 Update Pack 15 IF05
activemq-javadoc - addressed in versions 5.19.2-1, 5.19.6-1
activemq - addressed in versions 5.19.2-1, 5.19.6-1

External References

Related Security Bulletins