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The latter hostname verifying mode was not implemented in Apache Qpid Proton-J versions 0.3 to 0.29.0, with attempts to use it resulting in an exception. This left only the option to verify the certificate is trusted, leaving such a client vulnerable to Man In The Middle (MITM) attack. Uses of the Proton-J protocol engine which do not utilise the optional transport TLS wrapper are not impacted, e.g. usage within Qpid JMS. Uses of Proton-J utilising the optional transport TLS wrapper layer that wish to enable hostname verification must be upgraded to version 0.30.0 or later and utilise the VerifyMode#VERIFY_PEER_NAME configuration, which is now the default for client mode usage unless configured otherwise.","references":[{"reference_url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2018-17187.json","reference_id":"","reference_type":"","scores":[{"value":"6.8","scoring_system":"cvssv3","scoring_elements":"CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N"}],"url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2018-17187.json"},{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2018-17187","reference_id":"","reference_type":"","scores":[{"value":"0.00259","scoring_system":"epss","scoring_elements":"0.49127","published_at":"2026-05-05T12:55:00Z"},{"value":"0.00259","scoring_system":"epss","scoring_elements":"0.49212","published_at":"2026-04-29T12:55:00Z"},{"value":"0.00259","scoring_system":"epss","scoring_elements":"0.49254","published_at":"2026-04-26T12:55:00Z"},{"value":"0.00259","scoring_system":"epss","scoring_elements":"0.49256","published_at":"2026-04-21T12:55:00Z"},{"value":"0.00259","scoring_system":"epss","scoring_elements":"0.49287","published_at":"2026-04-18T12:55:00Z"},{"value":"0.00259","scoring_system":"epss","scoring_elements":"0.49291","published_at":"2026-04-16T12:55:00Z"},{"value":"0.00259","scoring_system":"epss","scoring_elements":"0.49244","published_at":"2026-04-13T12:55:00Z"},{"value":"0.00259","scoring_system":"epss","scoring_elements":"0.49239","published_at":"2026-04-12T12:55:00Z"},{"value":"0.00259","scoring_system":"epss","scoring_elements":"0.49266","published_at":"2026-04-11T12:55:00Z"},{"value":"0.00259","scoring_system":"epss","scoring_elements":"0.49248","published_at":"2026-04-09T12:55:00Z"},{"value":"0.00259","scoring_system":"epss","scoring_elements":"0.49252","published_at":"2026-04-08T12:55:00Z"},{"value":"0.00259","scoring_system":"epss","scoring_elements":"0.49197","published_at":"2026-04-07T12:55:00Z"},{"value":"0.00259","scoring_system":"epss","scoring_elements":"0.49186","published_at":"2026-04-01T12:55:00Z"},{"value":"0.00259","scoring_system":"epss","scoring_elements":"0.49217","published_at":"2026-04-02T12:55:00Z"},{"value":"0.00259","scoring_system":"epss","scoring_elements":"0.49245","published_at":"2026-04-24T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2018-17187"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-17187","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-17187"},{"reference_url":"https://github.com/advisories/GHSA-xvch-r4wf-h8w9","reference_id":"","reference_type":"","scores":[{"value":"7.4","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"},{"value":"HIGH","scoring_system":"cvssv3.1_qr","scoring_elements":""},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/advisories/GHSA-xvch-r4wf-h8w9"},{"reference_url":"https://github.com/apache/qpid-proton-j/commit/0cb8ca03cec42120dcfc434561592d89a89a805e","reference_id":"","reference_type":"","scores":[{"value":"7.4","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/apache/qpid-proton-j/commit/0cb8ca03cec42120dcfc434561592d89a89a805e"},{"reference_url":"https://issues.apache.org/jira/browse/PROTON-1962","reference_id":"","reference_type":"","scores":[{"value":"7.4","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://issues.apache.org/jira/browse/PROTON-1962"},{"reference_url":"https://mail-archives.apache.org/mod_mbox/qpid-users/201811.mbox/%3CCAFitrpQSV73Vz7rJYfLJK7gvEymZSCR5ooWUeU8j4jzRydk-eg%40mail.gmail.com%3E","reference_id":"","reference_type":"","scores":[{"value":"7.4","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://mail-archives.apache.org/mod_mbox/qpid-users/201811.mbox/%3CCAFitrpQSV73Vz7rJYfLJK7gvEymZSCR5ooWUeU8j4jzRydk-eg%40mail.gmail.com%3E"},{"reference_url":"http://www.securityfocus.com/bid/105935","reference_id":"","reference_type":"","scores":[{"value":"7.4","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"http://www.securityfocus.com/bid/105935"},{"reference_url":"https://bugzilla.redhat.com/show_bug.cgi?id=1651837","reference_id":"1651837","reference_type":"","scores":[],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1651837"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2018-17187","reference_id":"CVE-2018-17187","reference_type":"","scores":[{"value":"7.4","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"},{"value":"HIGH","scoring_system":"generic_textual"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