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Advisory record · GHSA-crg9-44h2-xw35

Apache ActiveMQ is vulnerable to Remote Code Execution

CVSS 10.0 CriticalCriticalIn CISA KEV · ransomwareEPSS 1.00 · 99th percentile

Critical, because:

  • In CISA’s KEV catalogue since 2 Nov 2023: it is known to be exploited.
  • CVSS score 10.0: 9.0 or more.
  • CVSS score 10.0 (7.0 or more) and EPSS 1.00 (0.1 or more): a high score and a real chance of exploitation in the next 30 days.

How we decide what’s critical

Published by the GitHub Advisory Database at 27 Oct 2023, 15:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.apache.activemq:activemq-clientMaven<5.15.16 || >=5.16.0, <5.16.7 || >=5.17.0, <5.17.6 || >=5.18.0, <5.18.35.15.16, 5.16.7, 5.17.6, 5.18.3
org.apache.activemq:activemq-openwire-legacyMaven>=5.8.0, <5.15.16 || >=5.16.0, <5.16.7 || >=5.17.0, <5.17.6 || >=5.18.0, <5.18.35.15.16, 5.16.7, 5.17.6, 5.18.3
Identifiers
GHSA-crg9-44h2-xw35 · BIT-activemq-2023-46604 · CVE-2023-46604
Weakness (CWE)
CWE-502
Tags
Published
27 Oct 2023
Updated
4 Nov 2025

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Apache ActiveMQ versions before 5.15.16, from 5.16.0 before 5.16.7, from 5.17.0 before 5.17.6, and from 5.18.0 before 5.18.3 are vulnerable, as are the activemq-client and activemq-openwire-legacy packages in those ranges. A remote attacker with network access to a broker can manipulate serialized class types in the OpenWire protocol to make the broker instantiate arbitrary classes from its classpath, allowing execution of arbitrary shell commands. Upgrade to 5.15.16, 5.16.7, 5.17.6, or 5.18.3, depending on the release line in use.

Written 7 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
10.0 Critical 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:H CNA (apache)
  • CISA KEV Listed since 2 Nov 2023: known to be exploited. CISA reports use in ransomware campaigns.
  • EPSS 1.00, the 99th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 15:10 UTC First seen by agentprime
  2. 31 Oct 2026, 15:10 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.