CVE-2025-27533: Apache ActiveMQ: Unchecked buffer length can cause excessive memory allocation

Quick answers

Is CVE-2025-27533 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2025-27533 being exploited in the wild.

How severe is CVE-2025-27533?

Low severity, with a CVSS score of 3.1, published 7 May 2025.

Which products and versions are affected?

org.apache.activemq:activemq-client (Maven) ECOSYSTEM:introduced=0,fixed=5.16.8; org.apache.activemq:activemq-openwire-legacy (Maven) ECOSYSTEM:introduced=0,fixed=5.16.8.

Is there a fix for CVE-2025-27533?

Yes. org.apache.activemq:activemq-client (Maven): upgrade to 5.16.8 or later; org.apache.activemq:activemq-openwire-legacy (Maven): upgrade to 5.16.8 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

Am I affected by CVE-2025-27533?

Check whether you run org.apache.activemq:activemq-client (Maven) or org.apache.activemq:activemq-openwire-legacy (Maven) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

• org.apache.activemq:activemq-client (Maven): upgrade to 5.16.8 or later

  # set org.apache.activemq:activemq-client to 5.16.8 in your pom.xml or build.gradle

• org.apache.activemq:activemq-openwire-legacy (Maven): upgrade to 5.16.8 or later

  # set org.apache.activemq:activemq-openwire-legacy to 5.16.8 in your pom.xml or build.gradle

Affected products

• org.apache.activemq:activemq-client (Maven) ECOSYSTEM:introduced=0,fixed=5.16.8
• org.apache.activemq:activemq-openwire-legacy (Maven) ECOSYSTEM:introduced=0,fixed=5.16.8

Identifiers

• CVE-2025-27533
• GHSA-whxr-3p84-rf3c