{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2025-66168", "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "state": "PUBLISHED", "assignerShortName": "apache", "dateReserved": "2025-11-21T20:44:42.659Z", "datePublished": "2026-03-04T08:45:00.932Z", "dateUpdated": "2026-03-04T09:15:41.385Z"}, "containers": {"cna": {"affected": [{"collectionURL": "https://repo.maven.apache.org/maven2", "defaultStatus": "unaffected", "packageName": "org.apache.activemq:apache-activemq", "product": "Apache ActiveMQ", "vendor": "Apache Software Foundation", "versions": [{"lessThan": "5.19.2", "status": "affected", "version": "0", "versionType": "semver"}, {"lessThan": "6.1.9", "status": "affected", "version": "6.0.0", "versionType": "semver"}, {"lessThan": "6.2.1", "status": "affected", "version": "6.2.0", "versionType": "semver"}]}, {"collectionURL": "https://repo.maven.apache.org/maven2", "defaultStatus": "unaffected", "packageName": "org.apache.activemq:activemq-all", "product": "Apache ActiveMQ All Module", "vendor": "Apache Software Foundation", "versions": [{"lessThan": "5.19.2", "status": "affected", "version": "0", "versionType": "semver"}, {"lessThan": "6.1.9", "status": "affected", "version": "6.0.0", "versionType": "semver"}, {"lessThan": "6.2.1", "status": "affected", "version": "6.2.0", "versionType": "semver"}]}, {"collectionURL": "https://repo.maven.apache.org/maven2", "defaultStatus": "unaffected", "packageName": "org.apache.activemq:activemq-mqtt", "product": "Apache ActiveMQ MQTT Module", "vendor": "Apache Software Foundation", "versions": [{"lessThan": "5.19.2", "status": "affected", "version": "0", "versionType": "semver"}, {"lessThan": "6.1.9", "status": "affected", "version": "6.0.0", "versionType": "semver"}, {"lessThan": "6.2.1", "status": "affected", "version": "6.2.0", "versionType": "semver"}]}], "credits": [{"lang": "en", "type": "finder", "value": "Gai Tanaka <641.work123@gmail.com>"}], "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p><span style=\"background-color: rgb(255, 255, 255);\">Apache ActiveMQ does not properly validate the remaining length field which may lead to an overflow during the decoding of malformed packets.&nbsp;</span><span style=\"background-color: rgb(255, 255, 255);\">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<span style=\"background-color: rgb(255, 255, 255);\">&nbsp;the broker susceptible to unexpected behavior when interacting with non-compliant clients.</span>&nbsp;</span><span style=\"background-color: rgb(255, 255, 255);\">This behavior violates the MQTT v3.1.1 specification, which restricts Remaining Length to a maximum of 4 bytes.</span>&nbsp;The scenario occurs on established connections after the authentication process. Brokers that are not enabling mqtt transport connectors are not impacted.</p><p>This issue affects Apache ActiveMQ: before 5.19.2, 6.0.0 to 6.1.8, and 6.2.0</p><p>Users are recommended to upgrade to version 5.19.2, 6.1.9, or 6.2.1, which fixes the issue.</p>"}], "value": "Apache ActiveMQ does not properly validate the remaining length field which may lead to an overflow during the decoding of malformed packets.\u00a0When this integer overflow occurs, ActiveMQ may incorrectly compute the total Remaining Length and subsequently misinterpret the payload as multiple MQTT control packets which makes\u00a0the broker susceptible to unexpected behavior when interacting with non-compliant clients.\u00a0This behavior violates the MQTT v3.1.1 specification, which restricts Remaining Length to a maximum of 4 bytes.\u00a0The scenario occurs on established connections after the authentication process. Brokers that are not enabling mqtt transport connectors are not impacted.\n\nThis issue affects Apache ActiveMQ: before 5.19.2, 6.0.0 to 6.1.8, and 6.2.0\n\nUsers are recommended to upgrade to version 5.19.2, 6.1.9, or 6.2.1, which fixes the issue."}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.4, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N", "version": "3.1"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N/E:F/RL:O/RC:C"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-190", "description": "CWE-190 Integer Overflow or Wraparound", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "shortName": "apache", "dateUpdated": "2026-03-04T08:45:00.932Z"}, "references": [{"tags": ["vendor-advisory"], "url": "https://lists.apache.org/thread/13n8mkrb2jf2y6yyhpgrkmpqcm7djyto"}], "source": {"discovery": "EXTERNAL"}, "title": "Apache ActiveMQ, Apache ActiveMQ All Module, Apache ActiveMQ MQTT Module: MQTT control packet remaining length field is not properly validated", "x_generator": {"engine": "Vulnogram 0.2.0"}}, "adp": [{"title": "CVE Program Container", "references": [{"url": "http://www.openwall.com/lists/oss-security/2026/03/03/5"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2026-03-04T09:15:41.385Z"}}]}}

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{"cveTags": [], "descriptions": [{"lang": "en", "value": "Apache ActiveMQ does not properly validate the remaining length field which may lead to an overflow during the decoding of malformed packets.\u00a0When this integer overflow occurs, ActiveMQ may incorrectly compute the total Remaining Length and subsequently misinterpret the payload as multiple MQTT control packets which makes\u00a0the broker susceptible to unexpected behavior when interacting with non-compliant clients.\u00a0This behavior violates the MQTT v3.1.1 specification, which restricts Remaining Length to a maximum of 4 bytes.\u00a0The scenario occurs on established connections after the authentication process. Brokers that are not enabling mqtt transport connectors are not impacted.\n\nThis issue affects Apache ActiveMQ: before 5.19.2, 6.0.0 to 6.1.8, and 6.2.0\n\nUsers are recommended to upgrade to version 5.19.2, 6.1.9, or 6.2.1, which fixes the issue."}], "id": "CVE-2025-66168", "lastModified": "2026-03-04T10:16:07.797", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.4, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 2.5, "source": "security@apache.org", "type": "Secondary"}]}, "published": "2026-03-04T09:15:54.757", "references": [{"source": "security@apache.org", "url": "https://lists.apache.org/thread/13n8mkrb2jf2y6yyhpgrkmpqcm7djyto"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.openwall.com/lists/oss-security/2026/03/03/5"}], "sourceIdentifier": "security@apache.org", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-190"}], "source": "security@apache.org", "type": "Secondary"}]}

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