{"cve":{"cve_id":"CVE-2025-66168","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":0.0078,"epss_percentile":0.51132,"epss_as_of":"2026-06-23","description":"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  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. 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.\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.","published_at":"2026-03-04T08:45:00.932000Z","last_modified_at":null,"cvss_v3_score":5.4,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","cvss_v3_severity":"MEDIUM","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":["CWE-190"],"nvd_references":["https://lists.apache.org/thread/13n8mkrb2jf2y6yyhpgrkmpqcm7djyto","https://www.cve.org/CVERecord?id=CVE-2026-40046","https://activemq.apache.org/security-advisories.data/CVE-2026-40046-announcement.txt"],"vuln_status":null,"trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-06-24T00:09:39.878444Z","updated_at":"2026-06-28T23:28:13.444760Z"},"effective_severity":"MEDIUM","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"PR","name":"Privileges Required","value":"L","value_label":"Low"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"L","value_label":"Low"},{"metric":"I","name":"Integrity","value":"L","value_label":"Low"},{"metric":"A","name":"Availability","value":"N","value_label":"None"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"apache-software-foundation","vendor_name":"Apache Software Foundation","product_slug":"apache-activemq","product_name":"Apache ActiveMQ","version_start":"0","version_start_inclusive":true,"version_end":"5.19.2","version_end_inclusive":false,"cpe23_uri":"cve5:apache-software-foundation:apache-activemq:0:5.19.2"},{"vendor_slug":"apache-software-foundation","vendor_name":"Apache Software Foundation","product_slug":"apache-activemq","product_name":"Apache ActiveMQ","version_start":"6.0.0","version_start_inclusive":true,"version_end":"6.1.9","version_end_inclusive":false,"cpe23_uri":"cve5:apache-software-foundation:apache-activemq:6.0.0:6.1.9"},{"vendor_slug":"apache-software-foundation","vendor_name":"Apache Software Foundation","product_slug":"apache-activemq","product_name":"Apache ActiveMQ","version_start":"6.2.0","version_start_inclusive":true,"version_end":"6.2.1","version_end_inclusive":false,"cpe23_uri":"cve5:apache-software-foundation:apache-activemq:6.2.0:6.2.1"},{"vendor_slug":"apache-software-foundation","vendor_name":"Apache Software Foundation","product_slug":"apache-activemq-all-module","product_name":"Apache ActiveMQ All Module","version_start":"0","version_start_inclusive":true,"version_end":"5.19.2","version_end_inclusive":false,"cpe23_uri":"cve5:apache-software-foundation:apache-activemq-all-module:0:5.19.2"},{"vendor_slug":"apache-software-foundation","vendor_name":"Apache Software Foundation","product_slug":"apache-activemq-all-module","product_name":"Apache ActiveMQ All Module","version_start":"6.0.0","version_start_inclusive":true,"version_end":"6.1.9","version_end_inclusive":false,"cpe23_uri":"cve5:apache-software-foundation:apache-activemq-all-module:6.0.0:6.1.9"},{"vendor_slug":"apache-software-foundation","vendor_name":"Apache Software Foundation","product_slug":"apache-activemq-all-module","product_name":"Apache ActiveMQ All Module","version_start":"6.2.0","version_start_inclusive":true,"version_end":"6.2.1","version_end_inclusive":false,"cpe23_uri":"cve5:apache-software-foundation:apache-activemq-all-module:6.2.0:6.2.1"},{"vendor_slug":"apache-software-foundation","vendor_name":"Apache Software Foundation","product_slug":"apache-activemq-mqtt-module","product_name":"Apache ActiveMQ MQTT Module","version_start":"0","version_start_inclusive":true,"version_end":"5.19.2","version_end_inclusive":false,"cpe23_uri":"cve5:apache-software-foundation:apache-activemq-mqtt-module:0:5.19.2"},{"vendor_slug":"apache-software-foundation","vendor_name":"Apache Software Foundation","product_slug":"apache-activemq-mqtt-module","product_name":"Apache ActiveMQ MQTT Module","version_start":"6.0.0","version_start_inclusive":true,"version_end":"6.1.9","version_end_inclusive":false,"cpe23_uri":"cve5:apache-software-foundation:apache-activemq-mqtt-module:6.0.0:6.1.9"},{"vendor_slug":"apache-software-foundation","vendor_name":"Apache Software Foundation","product_slug":"apache-activemq-mqtt-module","product_name":"Apache ActiveMQ MQTT Module","version_start":"6.2.0","version_start_inclusive":true,"version_end":"6.2.1","version_end_inclusive":false,"cpe23_uri":"cve5:apache-software-foundation:apache-activemq-mqtt-module:6.2.0:6.2.1"}],"exploit_refs":[],"news":[],"references":[{"url":"https://lists.apache.org/thread/13n8mkrb2jf2y6yyhpgrkmpqcm7djyto","source_type":"MAILING_LIST","tags":["mailing-list"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-40046","source_type":"CONFIRM","tags":[]},{"url":"https://activemq.apache.org/security-advisories.data/CVE-2026-40046-announcement.txt","source_type":"VENDOR_ADVISORY","tags":["advisory"]}],"timeline":[{"type":"published","at":"2026-03-04T08:45:00.932000Z","label":"CVE published","source":null},{"type":"cvss_changed","at":"2026-06-28T17:49:06.072201Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:49:06.072201Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:49:06.072201Z","label":"CVSS score revised","source":"cvelistv5"}]}