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high7.5Public exploit code

CVE-2025-27533

Apache ActiveMQ: Unchecked buffer length can cause excessive memory allocation

Public exploit code

Working exploit or proof of concept code has been published for this vulnerability. Treat unpatched systems as at risk.

Impact

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 packages

EcosystemPackageAffectedFixed in
mavenorg.apache.activemq:activemq-openwire-legacy< 5.16.85.16.8
mavenorg.apache.activemq:activemq-client< 5.16.85.16.8

Affected products

VendorProductAffected versions
ApacheActivemq
from 5.16.0 before 5.16.8
from 5.17.0 before 5.17.7
from 5.18.0 before 5.18.7
from 6.0.0 before 6.1.6

Weakness classification

CWE-789

References