What’s Vulnerable › Vulnerabilities

CVE-2021-4040

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-08-24 · updated 2026-06-17
• Weakness: CWE-400

Description

A flaw was found in AMQ Broker. This issue can cause a partial interruption to the availability of AMQ Broker via an Out of memory (OOM) condition. This flaw allows an attacker to partially disrupt availability to the broker through a sustained attack of maliciously crafted messages. The highest threat from this vulnerability is system availability.

Affected products

• Apache Software Foundation Apache ActiveMQ Artemis: before 2.19.1 — fixed in 2.19.1
• AMQ Broker: before 7.10.0 — fixed in 7.10.0

How to fix

Upgrade to a fixed version: Apache Software Foundation Apache ActiveMQ Artemis 2.19.1; AMQ Broker 7.10.0. Check the vendor advisory for mitigations.

References

• https://access.redhat.com/security/cve/CVE-2021-4040
• https://bugzilla.redhat.com/show_bug.cgi?id=2028254
• https://github.com/apache/activemq-artemis/pull/3871/commits
• https://issues.apache.org/jira/browse/ARTEMIS-3593
• https://access.redhat.com/security/cve/CVE-2021-4040
• https://bugzilla.redhat.com/show_bug.cgi?id=2028254
• https://github.com/apache/activemq-artemis/pull/3871/commits
• https://issues.apache.org/jira/browse/ARTEMIS-3593

Get alerted when CVE-2021-4040 or the next vulnerability affects your stack