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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.","references":[{"reference_url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-66168.json","reference_id":"","reference_type":"","scores":[{"value":"5.4","scoring_system":"cvssv3","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N"}],"url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-66168.json"},{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2025-66168","reference_id":"","reference_type":"","scores":[{"value":"0.00031","scoring_system":"epss","scoring_elements":"0.08923","published_at":"2026-04-04T12:55:00Z"},{"value":"0.00031","scoring_system":"epss","scoring_elements":"0.08873","published_at":"2026-04-02T12:55:00Z"},{"value":"0.00042","scoring_system":"epss","scoring_elements":"0.12787","published_at":"2026-04-09T12:55:00Z"},{"value":"0.00042","scoring_system":"epss","scoring_elements":"0.12656","published_at":"2026-04-07T12:55:00Z"},{"value":"0.00042","scoring_system":"epss","scoring_elements":"0.12735","published_at":"2026-04-08T12:55:00Z"},{"value":"0.00051","scoring_system":"epss","scoring_elements":"0.15461","published_at":"2026-05-05T12:55:00Z"},{"value":"0.00051","scoring_system":"epss","scoring_elements":"0.15684","published_at":"2026-05-09T12:55:00Z"},{"value":"0.00051","scoring_system":"epss","scoring_elements":"0.15581","published_at":"2026-05-07T12:55:00Z"},{"value":"0.00059","scoring_system":"epss","scoring_elements":"0.18215","published_at":"2026-05-11T12:55:00Z"},{"value":"0.00059","scoring_system":"epss","scoring_elements":"0.18242","published_at":"2026-05-12T12:55:00Z"},{"value":"0.00068","scoring_system":"epss","scoring_elements":"0.2092","published_at":"2026-04-29T12:55:00Z"},{"value":"0.00069","scoring_system":"epss","scoring_elements":"0.21211","published_at":"2026-04-11T12:55:00Z"},{"value":"0.00069","scoring_system":"epss","scoring_elements":"0.2097","published_at":"2026-04-26T12:55:00Z"},{"value":"0.00069","scoring_system":"epss","scoring_elements":"0.20967","published_at":"2026-04-24T12:55:00Z"},{"value":"0.00069","scoring_system":"epss","scoring_elements":"0.21095","published_at":"2026-04-21T12:55:00Z"},{"value":"0.00069","scoring_system":"epss","scoring_elements":"0.21118","published_at":"2026-04-18T12:55:00Z"},{"value":"0.00069","scoring_system":"epss","scoring_elements":"0.21109","published_at":"2026-04-16T12:55:00Z"},{"value":"0.00069","scoring_system":"epss","scoring_elements":"0.21116","published_at":"2026-04-13T12:55:00Z"},{"value":"0.00069","scoring_system":"epss","scoring_elements":"0.21168","published_at":"2026-04-12T12:55:00Z"},{"value":"0.00076","scoring_system":"epss","scoring_elements":"0.22649","published_at":"2026-05-15T12:55:00Z"},{"value":"0.00076","scoring_system":"epss","scoring_elements":"0.22632","published_at":"2026-05-14T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2025-66168"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-66168","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-66168"},{"reference_url":"https://github.com/apache/activemq","reference_id":"","reference_type":"","scores":[{"value":"5.4","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/apache/activemq"},{"reference_url":"https://lists.apache.org/thread/13n8mkrb2jf2y6yyhpgrkmpqcm7djyto","reference_id":"","reference_type":"","scores":[{"value":"5.4","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-03-04T20:27:42Z/"}],"url":"https://lists.apache.org/thread/13n8mkrb2jf2y6yyhpgrkmpqcm7djyto"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2025-66168","reference_id":"","reference_type":"","scores":[{"value":"5.4","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-66168"},{"reference_url":"http://www.openwall.com/lists/oss-security/2026/03/03/5","reference_id":"","reference_type":"","scores":[{"value":"5.4","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"http://www.openwall.com/lists/oss-security/2026/03/03/5"},{"reference_url":"https://bugzilla.redhat.com/show_bug.cgi?id=2444356","reference_id":"2444356","reference_type":"","scores":[],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2444356"},{"reference_url":"https://activemq.apache.org/security-advisories.data/CVE-2026-40046-announcement.txt","reference_id":"CVE-2026-40046-announcement.txt"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