Description
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.
INFO
Published Date :
2026-03-04T08:45:00.932Z
Last Modified :
2026-03-04T09:15:41.385Z
Source :
apache
AFFECTED PRODUCTS
The following products are affected by CVE-2025-66168 vulnerability.
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REFERENCES
Here, you will find a curated list of external links that provide in-depth information to CVE-2025-66168.
