Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2025-66168— Apache ActiveMQ, Apache ActiveMQ All Module, Apache ActiveMQ MQTT Module: MQTT control packet remaining length field is not properly validated

Quick assessment

Affected
Apache Software Foundation Apache ActiveMQ
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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 5.19.2之前版本、6.0.0至6.1.8版本和6.2.0版本存在安全漏洞，该漏洞源于未正确验证剩余长度字段，可能导致解码畸形数据包时发生整数溢出，使代理在与不合规客户端交互时出现意外行为。

CVSS 5.4 · Medium EPSS 0.78% · P54
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2025-66168

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Apache ActiveMQ, Apache ActiveMQ All Module, Apache ActiveMQ MQTT Module: MQTT control packet remaining length field is not properly validated
Source: CVE Program / CVE List V5
Vulnerability Description
WARNING: Users of 6.x should upgrade to 6.2.4 or later as the fix was missed in previous 6.x releases. See the  following for more details: https://activemq.apache.org/security-advisories.data/CVE-2026-40046-announcement.txt https://www.cve.org/CVERecord?id=CVE-2026-40046 Original Report: Apache ActiveMQ does not properly validate the remaining length field which may lead to an overflow during the decoding of malformed packets. When this integer overflow occurs, ActiveMQ may incorrectly compute the total Remaining Length and subsequently misinterpret the payload as multiple MQTT control packets which makes the broker susceptible to unexpected behavior when interacting with non-compliant clients. This behavior violates the MQTT v3.1.1 specification, which restricts Remaining Length to a maximum of 4 bytes. The scenario occurs on established connections after the authentication process. Brokers that are not enabling mqtt transport connectors are not impacted. This issue affects Apache ActiveMQ: before 5.19.2, 6.0.0 to 6.1.8, and 6.2.0 Users are recommended to upgrade to version 5.19.2, 6.1.9, or 6.2.1, which fixes the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
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 5.19.2之前版本、6.0.0至6.1.8版本和6.2.0版本存在安全漏洞，该漏洞源于未正确验证剩余长度字段，可能导致解码畸形数据包时发生整数溢出，使代理在与不合规客户端交互时出现意外行为。
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 0 ~ 5.19.2 -
Apache Software Foundation Apache ActiveMQ All Module 0 ~ 5.19.2 -
Apache Software Foundation Apache ActiveMQ MQTT Module 0 ~ 5.19.2 -

II. Public POCs for CVE-2025-66168

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2025-66168

请登录查看更多情报信息。

Vendor Advisories for CVE-2025-66168 (1)

Mailing List Discussions for CVE-2025-66168 (1)

IV. Related Vulnerabilities

Same product: Apache ActiveMQ
Same vendor: Apache Software Foundation
Same weakness: CWE-190

V. Comments for CVE-2025-66168

No comments yet

Leave a comment