{"cve":"CVE-2019-11777","nvd":{"published":"2019-09-11T18:15:10.757","modified":"2026-06-17T02:13:37.433","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","score":7.5},"cwes":["CWE-346","CWE-755"],"references":["https://bugs.eclipse.org/bugs/show_bug.cgi?id=549934","https://bugs.eclipse.org/bugs/show_bug.cgi?id=549934"],"products":["eclipse:paho_java_client"],"source":"nvd","synced_at":"2026-10-19T20:58:39.700375520+00:00"},"epss":{"cve":"CVE-2019-11777","score":0.00834,"percentile":0.5769,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-63qc-p2x4-9fgf","url":"https://osv.dev/vulnerability/GHSA-63qc-p2x4-9fgf","summary":"Improper Handling of Exceptional Conditions and Origin Validation Error in Eclipse Paho Java client library","modified":"2023-11-08T04:01:01.949579Z","packages":[{"ecosystem":"Maven","name":"org.eclipse.paho:org.eclipse.paho.client.mqttv3","purl":"pkg:maven/org.eclipse.paho/org.eclipse.paho.client.mqttv3","ranges":["<1.2.1"],"fixed":["1.2.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}