CVE-2025-27533

Summary

Memory Allocation with Excessive Size Value vulnerability in Apache ActiveMQ.

During unmarshalling of OpenWire commands the size value of buffers was not properly validated which could lead to excessive memory allocation and be exploited to cause a denial of service (DoS) by depleting process memory, thereby affecting applications and services that rely on the availability of the ActiveMQ broker when not using mutual TLS connections. This issue affects Apache ActiveMQ: from 6.0.0 before 6.1.6, from 5.18.0 before 5.18.7, from 5.17.0 before 5.17.7, before 5.16.8. ActiveMQ 5.19.0 is not affected.

Users are recommended to upgrade to version 6.1.6+, 5.19.0+, 5.18.7+, 5.17.7, or 5.16.8 or which fixes the issue.

Existing users may implement mutual TLS to mitigate the risk on affected brokers.

Affected Software

Weaknesses

• CWE-789: CWE-789 Memory Allocation with Excessive Size Value

ADP Enrichment

CVE Program Container

Additional References

• http://www.openwall.com/lists/oss-security/2025/05/06/1
• https://lists.debian.org/debian-lts-announce/2025/06/msg00020.html

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: partial

References

• https://lists.apache.org/thread/8hcm25vf7mchg4zbbhnlx2lc5bs705hg

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