CVE-2025-66168

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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": "WARNING:\n\nUsers of 6.x should upgrade to 6.2.4 or later as the fix was missed in previous 6.x releases.\n\nSee the\u00a0 following for more details:\n https://activemq.apache.org/security-advisories.data/CVE-2026-40046-announcement.txt \n https://www.cve.org/CVERecord?id=CVE-2026-40046 \n\n\n\nOriginal Report:\n\nApache 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": "2026-04-10T10:52:27.564Z"}, "references": [{"tags": ["vendor-advisory"], "url": "https://lists.apache.org/thread/13n8mkrb2jf2y6yyhpgrkmpqcm7djyto"}, {"tags": ["related"], "url": "https://www.cve.org/CVERecord?id=CVE-2026-40046"}, {"tags": ["related"], "url": "https://activemq.apache.org/security-advisories.data/CVE-2026-40046-announcement.txt"}], "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"}}, {"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-03-04T20:27:42.920592Z", "id": "CVE-2025-66168", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-03-04T20:28:45.825Z"}}]}}

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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.", "supportingMedia": [{"type": "text/html", "value": "<p><span style=\"background-color: rgb(255, 255, 255);\"><b>WARNING:</b><br><br></span><span style=\"background-color: rgb(239, 250, 102);\">Users of 6.x should upgrade to 6.2.4 or later as the fix was missed in previous 6.x releases.</span><span style=\"background-color: rgb(255, 255, 255);\"><br><br>See the&nbsp; following for more details:<br><a target=\"_blank\" rel=\"nofollow\" href=\"https://activemq.apache.org/security-advisories.data/CVE-2026-40046-announcement.txt\">https://activemq.apache.org/security-advisories.data/CVE-2026-40046-announcement.txt</a><br><a target=\"_blank\" rel=\"nofollow\" href=\"https://www.cve.org/CVERecord?id=CVE-2026-40046\">https://www.cve.org/CVERecord?id=CVE-2026-40046</a><br></span><span style=\"background-color: rgb(255, 255, 255);\"><br></span></p><p><span style=\"background-color: rgb(255, 255, 255);\"><b>Original Report:</b></span></p><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>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-190", "description": "CWE-190 Integer Overflow or Wraparound"}]}], "providerMetadata": {"orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "shortName": "apache", "dateUpdated": "2026-04-10T10:52:27.564Z"}}}, "cveMetadata": {"cveId": "CVE-2025-66168", "state": "PUBLISHED", "dateUpdated": "2026-04-10T10:52:27.564Z", "dateReserved": "2025-11-21T20:44:42.659Z", "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "datePublished": "2026-03-04T08:45:00.932Z", "assignerShortName": "apache"}, "dataVersion": "5.2"}

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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."}, {"lang": "es", "value": "Apache ActiveMQ no valida correctamente el campo de longitud restante, lo que puede llevar a un desbordamiento durante la decodificaci\u00f3n de paquetes malformados. Cuando ocurre este desbordamiento de entero, ActiveMQ puede calcular incorrectamente la longitud restante total y posteriormente malinterpretar la carga \u00fatil como m\u00faltiples paquetes de control MQTT, lo que hace que el broker sea susceptible a un comportamiento inesperado al interactuar con clientes no conformes. Este comportamiento viola la especificaci\u00f3n MQTT v3.1.1, que restringe la longitud restante a un m\u00e1ximo de 4 bytes. El escenario ocurre en conexiones establecidas despu\u00e9s del proceso de autenticaci\u00f3n. Los brokers que no est\u00e1n habilitando conectores de transporte mqtt no se ven afectados.\n\nEste problema afecta a Apache ActiveMQ: antes de 5.19.2, 6.0.0 a 6.1.8, y 6.2.0\n\nSe recomienda a los usuarios actualizar a la versi\u00f3n 5.19.2, 6.1.9, o 6.2.1, que corrige el problema."}], "id": "CVE-2025-66168", "lastModified": "2026-06-17T09:56:26.157", "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"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-66168", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-03-04T20:27:42.920592Z", "version": "2.0.3"}}]}, "published": "2026-03-04T09:15:54.757", "references": [{"source": "security@apache.org", "url": "https://activemq.apache.org/security-advisories.data/CVE-2026-40046-announcement.txt"}, {"source": "security@apache.org", "tags": ["Mailing List", "Vendor Advisory"], "url": "https://lists.apache.org/thread/13n8mkrb2jf2y6yyhpgrkmpqcm7djyto"}, {"source": "security@apache.org", "url": "https://www.cve.org/CVERecord?id=CVE-2026-40046"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "http://www.openwall.com/lists/oss-security/2026/03/03/5"}], "sourceIdentifier": "security@apache.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-190"}], "source": "security@apache.org", "type": "Secondary"}]}

{"bugzilla": {"description": "org.apache.activemq/apache-activemq: org.apache.activemq/activemq-all: org.apache.activemq/activemq-mqtt: Apache ActiveMQ: Unexpected behavior due to integer overflow in MQTT packet decoding", "id": "2444356", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2444356"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.4", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N", "status": "draft"}, "cwe": "CWE-130", "details": ["No description is available for this CVE."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2025-66168", "package_state": [{"cpe": "cpe:/a:redhat:jboss_fuse:7", "fix_state": "Fix deferred", "package_name": "activemq-all", "product_name": "Red Hat Fuse 7"}, {"cpe": "cpe:/a:redhat:jboss_fuse:7", "fix_state": "Fix deferred", "package_name": "activemq-mqtt", "product_name": "Red Hat Fuse 7"}, {"cpe": "cpe:/a:redhat:jboss_enterprise_application_platform:7", "fix_state": "Fix deferred", "package_name": "activemq-mqtt", "product_name": "Red Hat JBoss Enterprise Application Platform 7"}, {"cpe": "cpe:/a:redhat:jboss_enterprise_application_platform:8", "fix_state": "Fix deferred", "package_name": "activemq-mqtt", "product_name": "Red Hat JBoss Enterprise Application Platform 8"}, {"cpe": "cpe:/a:redhat:jbosseapxp", "fix_state": "Fix deferred", "package_name": "activemq-mqtt", "product_name": "Red Hat JBoss Enterprise Application Platform Expansion Pack"}], "public_date": "2026-03-04T08:45:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-66168\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-66168\nhttp://www.openwall.com/lists/oss-security/2026/03/03/5\nhttps://lists.apache.org/thread/13n8mkrb2jf2y6yyhpgrkmpqcm7djyto"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,5.19.2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.0.0,6.1.9)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.2.0,6.2.1)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "product": "activemq", "vendor": "apache"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,5.19.2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.0.0,6.1.9)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.2.0,6.2.1)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "product": "activemq_all_module", "vendor": "apache"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,5.19.2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.0.0,6.1.9)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.2.0,6.2.1)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "product": "activemq_mqtt_module", "vendor": "apache"}], "analysis": {"en": {"generated_at": "2026-04-20T17:25:37.220902+00:00", "value": {"mitigation_remediation": ["Upgrade Apache ActiveMQ to version 5.19.2, 6.1.9, or 6.2.1 (or later) to apply the official fix.", "If MQTT transport connectors remain enabled, ensure that client connections are monitored for malformed packets and reject packets that exceed the 4\u2011byte Remaining Length limit, following proper MQTT validation practices.", "Deploy network perimeter controls or application layer firewalls that validate MQTT packets for correct length fields to prevent malformed traffic from reaching the broker."], "summary": {"action": "Patch Now", "impact": "Integer overflow in MQTT remaining length causing broker to misinterpret packets and exhibit unexpected behavior"}, "threat_synthesis": {"affected_systems": "Affected versions are Apache ActiveMQ prior to 5.19.2, 6.0.0 through 6.1.8, and 6.2.0 for all modules, including the MQTT module. Users of 6.x should upgrade to 6.2.4 or later, while earlier releases must update to at least 5.19.2, 6.1.9, or 6.2.1. Systems that do not enable MQTT transport connectors are not impacted.", "description_and_impact": "The vulnerability occurs when ActiveMQ does not properly validate the MQTT remaining length field, allowing a malformed packet to overflow the integer used to calculate the total Remaining Length. This overflow can lead the broker to incorrectly parse the payload as multiple MQTT control packets, violating the MQTT v3.1.1 specification that limits Remaining Length to 4 bytes. The result is unexpected broker behavior that could include errors, misrouting, or service disruption, reflecting weaknesses in integer handling and calculation. The primary impact is to the broker\u2019s availability and reliability during MQTT communication.", "risk_and_exploitability": "With a CVSS score of 5.4 and an EPSS score under 1%, the exploitation probability is low, and the vulnerability is not listed in CISA\u2019s KEV catalog. However, the flaw can be triggered on an established, authenticated MQTT connection over an enabled transport connector. An attacker feeding a crafted packet can exploit the integer overflow to cause the broker to misinterpret the payload, potentially disrupting its operation. The attack does not require privileged access and can be deployed remotely by any client that can send MQTT traffic to the broker."}}}}, "created": "2026-03-04T21:03:51.644221+00:00", "updated": "2026-04-20T17:30:12.655590+00:00", "vendors": ["apache", "apache$PRODUCT$activemq", "apache$PRODUCT$activemq_all_module", "apache$PRODUCT$activemq_mqtt_module"]}