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ActiveMQ: Denial of Service via Out of Memory vulnerability\nDenial of Service via Out of Memory vulnerability in Apache ActiveMQ Client, Apache ActiveMQ Broker, Apache ActiveMQ.\n\nActiveMQ NIO SSL transports do not correctly handle TLSv1.3 handshake KeyUpdates triggered by clients. This makes it possible for a client to rapidly trigger updates which causes the broker to exhaust all its memory in the SSL engine leading to DoS.\n\nNote: TLS versions before TLSv1.3 (such as TLSv1.2) are broken but are not vulnerable to OOM. Previous TLS versions require a full handshake renegotiation which causes a connection to hang but not OOM. This is fixed as well.\nThis issue affects Apache ActiveMQ Client: before 5.19.4, from 6.0.0 before 6.2.4; Apache ActiveMQ Broker: before 5.19.4, from 6.0.0 before 6.2.4; Apache ActiveMQ: before 5.19.4, from 6.0.0 before 6.2.4.\n\nUsers are recommended to upgrade to version 6.2.4 or 5.19.5, which fixes the 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ActiveMQ is Vulnerable to Integer Overflow or Wraparound\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.","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":"0.22632","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","reference_type":"","scores":[{"value":"5.4","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC: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