Skip to content
Fencer Vulns
high 7.5

CVE-2025-27533 json

Apache ActiveMQ: Unchecked buffer length can cause excessive memory allocation

published 2025-05-07 18 mo ago modified 2026-09-10 1 mo ago also BIT-activemq-2025-27533 , EUVD-2025-13714 , GHSA-whxr-3p84-rf3c

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
9.1%
EPSS 9.1% chance of exploitation in 30 days, percentile 95%
public exploits
1
Exploit-DB

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.

Patch / fix

  • maven org.apache.activemq:activemq-openwire-legacy 5.16.8, 5.17.7, 5.18.7, 6.1.6
  • maven org.apache.activemq:activemq-client 5.16.8, 5.17.7, 5.18.7, 6.1.6
  • bitnami activemq 5.16.8, 5.17.7, 5.18.7, 6.1.6
  • Apache Software Foundation Apache ActiveMQ 5.16.8, 5.17.7, 5.18.7, 6.1.6
  • activemq Debian 13 5.17.6+dfsg-2

debian advisories DEBIAN-CVE-2025-27533

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-27533 updated cvss 4.9

ActiveMQ: ActiveMQ: Unvalidated Buffer Size Allocation

  • Red Hat A-MQ Clients 2 activemq-openwire-legacy Red Hat Data Grid 8 activemq-openwire-legacy Red Hat Fuse 7 activemq-openwire-legacy Red Hat Integration Camel K 1 activemq-openwire-legacy Red Hat streams for Apache Kafka activemq-openwire-legacy
    affected: no fix available “Fix deferred”
  • Red Hat AMQ Broker 7.13.2
    fixed: vendor fix RHSA-2025:17567
  • Red Hat build of Quarkus activemq-openwire-legacy
    not affected: component not present
  • Red Hat JBoss Enterprise Application Platform 7 activemq-openwire-legacy Red Hat JBoss Enterprise Application Platform 8 activemq-openwire-legacy Red Hat JBoss Enterprise Application Platform Expansion Pack activemq-openwire-legacy
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Timeline

  1. Published
  2. First public exploit (EDB-52288)

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
18 mo ago

Exploit prediction

9.11% chance of exploitation in the next 30 days, higher than 95% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-52288 Apache ActiveMQ 6.1.6 - Denial of Service (DOS) remote, 2025-05-09

CVSS scores

assigned by version score vector
CNA 4.0 6.9 CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/AU:Y/R:A/V:D/RE:M/U:Red
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 4.0 6.9 CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:A/V:D/RE:M/U:Red
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
maven org.apache.activemq:activemq-openwire-legacy
<5.16.8
>=5.17.0, <5.17.7
>=5.18.0, <5.18.7
>=6.0.0, <6.1.6
5.16.8
5.17.7
5.18.7
6.1.6
maven org.apache.activemq:activemq-client
<5.16.8
>=5.17.0, <5.17.7
>=5.18.0, <5.18.7
>=6.0.0, <6.1.6
5.16.8
5.17.7
5.18.7
6.1.6
bitnami activemq
>=5.16.0, <5.16.8
>=5.17.0, <5.17.7
>=5.18.0, <5.18.7
>=6.0.0, <6.1.6
5.16.8
5.17.7
5.18.7
6.1.6

Affected products

  • Apache Software Foundation Apache ActiveMQ

Classification

Weakness
  • CWE-789 Memory Allocation with Excessive Size Value

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.