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

CVE-2025-66168 has a CVSS 3.1 base score of 5.4 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N. EPSS exploitation probability: 0.1%.

Which versions of Apache are affected by CVE-2025-66168?

CVE-2025-66168 presents moderate security risk, a integer overflow vulnerability rated CVSS 5.4. Exploitation could cause memory corruption or application crashes.. A patch is available.

How to fix or mitigate CVE-2025-66168?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

Apache CVE-2025-66168

MEDIUM

Integer Overflow or Wraparound (CWE-190)

2026-03-04 security@apache.org

GHSA-c825-6ph3-4h84

Buffer Overflow Apache Integer Overflow

5.4

CVSS 3.1

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

Patch released

Mar 31, 2026 - 21:13 nvd

Patch available

Analysis Generated

Mar 12, 2026 - 22:05 vuln.today

CVE Published

Mar 04, 2026 - 09:15 nvd

MEDIUM 5.4

Blast Radius

ecosystem impact

† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth

6 maven packages depend on org.apache.activemq:activemq-all (3 direct, 3 indirect)
6 maven packages depend on org.apache.activemq:activemq-mqtt (5 direct, 1 indirect)

Ecosystem-wide dependent count for version 6.0.0 and other introduced versions.

DescriptionNVD

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.

AnalysisAI

Apache ActiveMQ does not properly validate the remaining length field which may lead to an overflow during the decoding of malformed packets. [CVSS 5.4 MEDIUM]

Technical ContextAI

Classified as CWE-190 (Integer Overflow or Wraparound). Affects Activemq. 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 Lengt

RemediationAI

Update to version 5.19.2 or later. Restrict network access to the affected service where possible.

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Vendor StatusVendor

CVE-2025-66168 vulnerability details – vuln.today

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