Is CVE-2025-66168 actively exploited?

No active exploitation of CVE-2025-66168 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2025-66168 be exploited remotely?

Yes. CVE-2025-66168 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2025-66168?

CVE-2025-66168 has a CVSS score of 8.8 (HIGH).

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HIGH

CVE-2025-66168

CWE-190Published: March 4, 2026· Updated: Mar 10, 2026

8.8

CVSS v3.1

EPSS:0.06%probability of exploitation in 30 daysPercentile:17.1th

Official 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.

NVD Source

Technical Analysis

CVE-2025-66168 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.8.