{"id":"CVE-2019-11777","aliases":["EUVD-2019-0656","GHSA-63qc-p2x4-9fgf"],"status":"published","title":"Improper Handling of Exceptional Conditions and Origin Validation Error in Eclipse Paho Java client library","description":"In the Eclipse Paho Java client library version 1.2.0, when connecting to an MQTT server using TLS and setting a host name verifier, the result of that verification is not checked. This could allow one MQTT server to impersonate another and provide the client library with incorrect information.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.00834,"percentile":0.5798,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-346","CWE-755"],"published":"2019-09-11T17:55:21Z","modified":"2026-10-24T10:30:52Z","fixes":[{"ecosystem":"Maven","package":"org.eclipse.paho:org.eclipse.paho.client.mqttv3","fixed_in":["1.2.1"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Maven","package":"org.eclipse.paho:org.eclipse.paho.client.mqttv3","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.2.1"}]}]},{"source":"osv","ecosystem":"Maven","package":"org.eclipse.paho:org.eclipse.paho.client.mqttv3","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.2.1"}]}],"versions":["1.0.2","1.1.0","1.1.1","1.2.0"]}],"products":[{"vendor":"eclipse","product":"paho_java_client"},{"vendor":"the eclipse foundation","product":"eclipse paho"}],"references":[{"url":"https://bugs.eclipse.org/bugs/show_bug.cgi?id=549934","tags":["x_refsource_CONFIRM","x_transferred","Issue Tracking","Vendor Advisory","report","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2019-11777","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-63qc-p2x4-9fgf"}],"sources":{"cve":[{"id":"CVE-2019-11777","description":"In the Eclipse Paho Java client library version 1.2.0, when connecting to an MQTT server using TLS and setting a host name verifier, the result of that verification is not checked. This could allow one MQTT server to impersonate another and provide the client library with incorrect information.","status":"published","published":"2019-09-11T17:55:21Z","modified":"2024-08-04T23:03:32.792Z","cwes":["CWE-346"],"updated_at":"2026-11-02T14:32:22.432545Z"}],"euvd":[{"id":"EUVD-2019-0656","description":"In the Eclipse Paho Java client library version 1.2.0, when connecting to an MQTT server using TLS and setting a host name verifier, the result of that verification is not checked. This could allow one MQTT server to impersonate another and provide the client library with incorrect information.","status":"published","published":"2019-09-11T17:55:21Z","modified":"2024-08-04T23:03:32Z","updated_at":"2026-11-03T02:40:48.505669Z"}],"ghsa":[{"id":"GHSA-63qc-p2x4-9fgf","title":"Improper Handling of Exceptional Conditions and Origin Validation Error in Eclipse Paho Java client library","description":"In the Eclipse Paho Java client library version 1.2.0, when connecting to an MQTT server using TLS and setting a host name verifier, the result of that verification is not checked. This could allow one MQTT server to impersonate another and provide the client library with incorrect information.","status":"published","published":"2019-09-17T22:47:11Z","modified":"2023-02-01T05:02:35Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"cwes":["CWE-346","CWE-755"],"updated_at":"2026-11-02T14:36:30.61364Z"}],"nvd":[{"id":"CVE-2019-11777","description":"In the Eclipse Paho Java client library version 1.2.0, when connecting to an MQTT server using TLS and setting a host name verifier, the result of that verification is not checked. This could allow one MQTT server to impersonate another and provide the client library with incorrect information.","status":"published","published":"2019-09-11T18:15:10.757Z","modified":"2026-06-17T02:13:37.433Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:P/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-346","CWE-755"],"updated_at":"2026-11-02T14:05:25.691233Z"}],"osv":[{"id":"CVE-2019-11777","description":"In the Eclipse Paho Java client library version 1.2.0, when connecting to an MQTT server using TLS and setting a host name verifier, the result of that verification is not checked. This could allow one MQTT server to impersonate another and provide the client library with incorrect information.","status":"published","published":"2019-09-11T18:15:10.757Z","modified":"2026-10-24T10:30:52.884947156Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"updated_at":"2026-11-02T15:44:10.718934Z"},{"id":"GHSA-63qc-p2x4-9fgf","title":"Improper Handling of Exceptional Conditions and Origin Validation Error in Eclipse Paho Java client library","description":"In the Eclipse Paho Java client library version 1.2.0, when connecting to an MQTT server using TLS and setting a host name verifier, the result of that verification is not checked. This could allow one MQTT server to impersonate another and provide the client library with incorrect information.","status":"published","published":"2019-09-17T22:47:11Z","modified":"2023-11-08T04:01:01.949579Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"cwes":["CWE-346","CWE-755"],"updated_at":"2026-11-02T15:46:39.266402Z"}]}}