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Advisory: Improper Certificate Validation in Apache Qpid Proton\n## Withdrawn Advisory\nThis advisory has been withdrawn because the vulnerability only affects the **Qpid Proton C library** and not `org.apache.qpid:proton-j`. This link has been maintained to preserve external references.\n\n## Original Description\n\nWhile investigating bug PROTON-2014, we discovered that under some circumstances Apache Qpid Proton versions 0.9 to 0.27.0 (C library and its language bindings) can connect to a peer anonymously using TLS *even when configured to verify the peer certificate* while used with OpenSSL versions before 1.1.0. This means that an undetected man in the middle attack could be constructed if an attacker can arrange to intercept TLS traffic.","references":[{"reference_url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-0223.json","reference_id":"","reference_type":"","scores":[{"value":"7.4","scoring_system":"cvssv3","scoring_elements":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"}],"url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-0223.json"},{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2019-0223","reference_id":"","reference_type":"","scores":[{"value":"0.00399","scoring_system":"epss","scoring_elements":"0.6067","published_at":"2026-04-13T12:55:00Z"},{"value":"0.00399","scoring_system":"epss","scoring_elements":"0.60616","published_at":"2026-04-07T12:55:00Z"},{"value":"0.00399","scoring_system":"epss","scoring_elements":"0.60691","published_at":"2026-04-12T12:55:00Z"},{"value":"0.00399","scoring_system":"epss","scoring_elements":"0.60705","published_at":"2026-04-11T12:55:00Z"},{"value":"0.00399","scoring_system":"epss","scoring_elements":"0.6068","published_at":"2026-04-09T12:55:00Z"},{"value":"0.00399","scoring_system":"epss","scoring_elements":"0.60664","published_at":"2026-04-08T12:55:00Z"},{"value":"0.00399","scoring_system":"epss","scoring_elements":"0.60541","published_at":"2026-04-01T12:55:00Z"},{"value":"0.00399","scoring_system":"epss","scoring_elements":"0.60615","published_at":"2026-04-02T12:55:00Z"},{"value":"0.00399","scoring_system":"epss","scoring_elements":"0.60645","published_at":"2026-04-04T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2019-0223"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-0223","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-0223"},{"reference_url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml","reference_id":"","reference_type":"","scores":[{"value":"7.4","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"}],"url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml"},{"reference_url":"https://issues.apache.org/jira/browse/PROTON-2014?page=com.atlassian.jira.plugin.system.issuetabpanels%3Aall-tabpanel","reference_id":"","reference_type":"","scores":[{"value":"7.4","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/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-2014?page=com.atlassian.jira.plugin.system.issuetabpanels%3Aall-tabpanel"},{"reference_url":"https://lists.apache.org/thread.html/008ee5e78e5a090e1fcc5f6617f425e4e51d59f03d3eda2dd006df9f@%3Cusers.qpid.apache.org%3E","reference_id":"","reference_type":"","scores":[{"value":"7.4","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/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://lists.apache.org/thread.html/008ee5e78e5a090e1fcc5f6617f425e4e51d59f03d3eda2dd006df9f@%3Cusers.qpid.apache.org%3E"},{"reference_url":"https://lists.apache.org/thread.html/3adb2f020f705b4fd453982992a68cd10f9d5ac728b699efdb73c1f5@%3Cdev.qpid.apache.org%3E","reference_id":"","reference_type":"","scores":[{"value":"7.4","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/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://lists.apache.org/thread.html/3adb2f020f705b4fd453982992a68cd10f9d5ac728b699efdb73c1f5@%3Cdev.qpid.apache.org%3E"},{"reference_url":"https://lists.apache.org/thread.html/49c83f0acce5ceaeffca51714ec2ba0f0199bcb8f99167181bba441b@%3Cdev.qpid.apache.org%3E","reference_id":"","reference_type":"","scores":[{"value":"7.4","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/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://lists.apache.org/thread.html/49c83f0acce5ceaeffca51714ec2ba0f0199bcb8f99167181bba441b@%3Cdev.qpid.apache.org%3E"},{"reference_url":"https://lists.apache.org/thread.html/914424e4d798a340f523b6169aaf39b626971d9bb00fcdeb1d5d6c0d@%3Ccommits.qpid.apache.org%3E","reference_id":"","reference_type":"","scores":[{"value":"7.4","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/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://lists.apache.org/thread.html/914424e4d798a340f523b6169aaf39b626971d9bb00fcdeb1d5d6c0d@%3Ccommits.qpid.apache.org%3E"},{"reference_url":"https://lists.apache.org/thread.html/d9c9a882a292e2defaed1f954528c916fb64497ce57db652727e39b0@%3Cannounce.apache.org%3E","reference_id":"","reference_type":"","scores":[{"value":"7.4","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/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://lists.apache.org/thread.html/d9c9a882a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Apache Qpid Proton-J transport includes an optional wrapper layer to perform TLS, enabled by use of the 'transport.ssl(...)' methods. Unless a verification mode was explicitly configured, client and server modes previously defaulted as documented to not verifying a peer certificate, with options to configure this explicitly or select a certificate verification mode with or without hostname verification being performed. 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":"0.49244","published_at":"2026-04-13T12:55:00Z"},{"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":"0.49239","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":"0.49186","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":"2026-04-04T12:55:00Z"}],"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","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2018-17187"},{"reference_url":"https://qpid.apache.org/cves/CVE-2018-17187.html","reference_id":"CVE-2018-17187.HTML","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://qpid.apache.org/cves/CVE-2018-17187.html"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/937188?format=json","purl":"pkg:deb/debian/qpid-proton@0.22.0-1?distro=trixie","is_vulnerable":false,"affected_by_vulnerabilities":[]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C client and C-based client bindings in the Apache Qpid Proton library before 0.13.1 on Windows do not properly verify that the server hostname matches a domain name in the subject's Common Name (CN) or subjectAltName field of the X.509 certificate when using the SChannel-based security layer, which allows man-in-the-middle attackers to spoof servers via an arbitrary valid 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