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

Quick assessment

Affected
Apache Software Foundation Apache ActiveMQ
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Apache ActiveMQ是美国阿帕奇（Apache）基金会的一套开源的消息中间件，它支持Java消息服务、集群、Spring Framework等。 Apache ActiveMQ 6.1.6之前版本、5.18.7之前版本、5.17.7之前版本和5.16.8之前版本存在安全漏洞，该漏洞源于缓冲区大小验证不足，可能导致拒绝服务。

AI Predicted 7.5 Difficulty: Easy EPSS 8.96% · P95

Public Exploits 1

ExploitDB · 1 EDB-52288 [remote]

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2025-27533

Vulnerability Information
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Vulnerability Title
Apache ActiveMQ: Unchecked buffer length can cause excessive memory allocation
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的内存分配
Source: CVE Program / CVE List V5
Vulnerability Title
Apache ActiveMQ 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache ActiveMQ是美国阿帕奇（Apache）基金会的一套开源的消息中间件，它支持Java消息服务、集群、Spring Framework等。 Apache ActiveMQ 6.1.6之前版本、5.18.7之前版本、5.17.7之前版本和5.16.8之前版本存在安全漏洞，该漏洞源于缓冲区大小验证不足，可能导致拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache ActiveMQ 6.0.0 ~ 6.1.6 -

II. Public POCs for CVE-2025-27533

# POC Description Source Link Shenlong Link
1 exploit for CVE-2025-27533, a Denial of Service (DoS) vulnerability in Apache ActiveMQ https://github.com/absholi7ly/CVE-2025-27533-Exploit-for-Apache-ActiveMQ POC Details
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III. Intelligence Information for CVE-2025-27533

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IV. Related Vulnerabilities

Same product: Apache ActiveMQ
Same vendor: Apache Software Foundation
Same weakness: CWE-789

V. Comments for CVE-2025-27533

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