CVE-2023-46604: Apache ActiveMQ Deserialization of Untrusted Data Vulnerability

Critical severity, CVSS 9.8. Actively exploited: in CISA KEV since 2023-11-02. EPSS: 99.9% chance of exploitation in the next 30 days.

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.

Affected products

• Apache ActiveMQ: before 5.15.16 (fixed in 5.15.16); from 5.16.0, before 5.16.7 (fixed in 5.16.7); from 5.17.0, before 5.17.6 (fixed in 5.17.6); from 5.18.0, before 5.18.3 (fixed in 5.18.3)
• Apache ActiveMQ Legacy Openwire Module: before 5.15.16 (fixed in 5.15.16); from 5.16.0, before 5.16.7 (fixed in 5.16.7); from 5.17.0, before 5.17.6 (fixed in 5.17.6); from 5.18.0, before 5.18.3 (fixed in 5.18.3)
• Debian Debian Linux: version 10.0 only; version 11.0 only
• Netapp E-Series Santricity Unified Manager: affected versions not specified
• Netapp E-Series Santricity Web Services Proxy: affected versions not specified
• Netapp Santricity Storage Plugin: affected versions not specified

Published 2023-10-27. Last modified 2026-06-17.