{"id":"CVE-2020-11050","aliases":["EUVD-2020-0424","GHSA-gw55-jm4h-x339"],"status":"published","title":"Improper Validation of Certificate with Host Mismatch in Java-WebSocket","description":"In Java-WebSocket less than or equal to 1.4.1, there is an Improper Validation of Certificate with Host Mismatch where WebSocketClient does not perform SSL hostname validation. This has been patched in 1.5.0.","severity":{"version":"3.1","score":9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00791,"percentile":0.56554,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-295","CWE-297"],"published":"2020-05-07T20:15:12Z","modified":"2026-10-20T10:51:41Z","fixes":[{"ecosystem":"Maven","package":"org.java-websocket:Java-WebSocket","fixed_in":["1.5.0"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Maven","package":"org.java-websocket:Java-WebSocket","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"1.4.1"},{"fixed":"1.5.0"}]}]},{"source":"osv","ecosystem":"Maven","package":"org.java-websocket:Java-WebSocket","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.5.0"}]}],"versions":["1.3.0","1.3.4","1.3.5","1.3.6","1.3.7","1.3.8","1.3.9","1.4.0","1.4.1"]}],"products":[{"vendor":"java-websocket_project","product":"java-websocket"},{"vendor":"tootallnate","product":"java-websocket"}],"references":[{"url":"https://github.com/TooTallNate/Java-WebSocket/security/advisories/GHSA-gw55-jm4h-x339","tags":["x_refsource_CONFIRM","x_transferred","Third Party Advisory","advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-11050","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-gw55-jm4h-x339"},{"url":"https://github.com/TooTallNate/Java-WebSocket","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2020-11050","title":"Improper Validation of Certificate with Host Mismatch in Java-WebSocket","description":"In Java-WebSocket less than or equal to 1.4.1, there is an Improper Validation of Certificate with Host Mismatch where WebSocketClient does not perform SSL hostname validation. This has been patched in 1.5.0.","status":"published","published":"2020-05-07T20:15:12Z","modified":"2024-08-04T11:21:14.437Z","cvss":[{"version":"3.1","score":9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"critical","assessor":"cna"}],"cwes":["CWE-297"],"updated_at":"2026-11-02T14:35:57.352161Z"}],"euvd":[{"id":"EUVD-2020-0424","description":"In Java-WebSocket less than or equal to 1.4.1, there is an Improper Validation of Certificate with Host Mismatch where WebSocketClient does not perform SSL hostname validation. This has been patched in 1.5.0.","status":"published","published":"2020-05-07T20:15:12Z","modified":"2024-08-04T11:21:14Z","cvss":[{"version":"3.1","score":9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-03T03:07:48.471313Z"}],"ghsa":[{"id":"GHSA-gw55-jm4h-x339","title":"Improper Validation of Certificate with Host Mismatch in Java-WebSocket","description":"The Java-WebSocket Client does not perform hostname verification.\n\n - This means that SSL certificates of other hosts are accepted as long as they are trusted. To exploit this vulnerability an attacker has to perform a man-in-the-middle (MITM) attack between a Java application using the Java-WebSocket Client and an WebSocket server it's connecting to.\n - TLS normally protects users and systems against MITM attacks, it cannot if certificates from other trusted hosts are accepted by the client.\n\nFor more information see: CWE-297: Improper Validation of Certificate with Host Mismatch - https://cwe.mitre.org/data/definitions/297.html\n\n## Important note\n\nThe OWASP Dependency-Check (https://jeremylong.github.io/DependencyCheck/index.html) may report that a dependency of your project is affected by this security vulnerability, but you don't use this lib.\nThis is caused by the fuzzy search in the OWASP implementation.\nCheck out this issue (https://github.com/TooTallNate/Java-WebSocket/issues/1019#issuecomment-628507934) for more information and a way to suppress the warning.","status":"published","published":"2020-05-08T18:54:39Z","modified":"2023-02-01T05:02:59Z","cvss":[{"version":"3.1","score":9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-295","CWE-297"],"updated_at":"2026-11-02T14:36:31.364752Z"}],"nvd":[{"id":"CVE-2020-11050","description":"In Java-WebSocket less than or equal to 1.4.1, there is an Improper Validation of Certificate with Host Mismatch where WebSocketClient does not perform SSL hostname validation. This has been patched in 1.5.0.","status":"published","published":"2020-05-07T21:15:11.42Z","modified":"2026-06-17T02:48:56.75Z","cvss":[{"version":"3.1","score":9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"critical","assessor":"secondary"},{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":6.8,"vector":"AV:N/AC:M/Au:N/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-297","CWE-295"],"updated_at":"2026-11-02T14:06:00.784809Z"}],"osv":[{"id":"CVE-2020-11050","description":"In Java-WebSocket less than or equal to 1.4.1, there is an Improper Validation of Certificate with Host Mismatch where WebSocketClient does not perform SSL hostname validation. This has been patched in 1.5.0.","status":"published","published":"2020-05-07T21:15:11.42Z","modified":"2026-10-20T10:51:41.296758817Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:13.492058Z"},{"id":"GHSA-gw55-jm4h-x339","title":"Improper Validation of Certificate with Host Mismatch in Java-WebSocket","description":"The Java-WebSocket Client does not perform hostname verification.\n\n - This means that SSL certificates of other hosts are accepted as long as they are trusted. To exploit this vulnerability an attacker has to perform a man-in-the-middle (MITM) attack between a Java application using the Java-WebSocket Client and an WebSocket server it's connecting to.\n - TLS normally protects users and systems against MITM attacks, it cannot if certificates from other trusted hosts are accepted by the client.\n\nFor more information see: CWE-297: Improper Validation of Certificate with Host Mismatch - https://cwe.mitre.org/data/definitions/297.html\n\n## Important note\n\nThe OWASP Dependency-Check (https://jeremylong.github.io/DependencyCheck/index.html) may report that a dependency of your project is affected by this security vulnerability, but you don't use this lib.\nThis is caused by the fuzzy search in the OWASP implementation.\nCheck out this issue (https://github.com/TooTallNate/Java-WebSocket/issues/1019#issuecomment-628507934) for more information and a way to suppress the warning.","status":"published","published":"2020-05-08T18:54:39Z","modified":"2026-09-10T03:48:47.350626091Z","cvss":[{"version":"3.1","score":9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-295","CWE-297"],"updated_at":"2026-11-02T15:46:48.191583Z"}]}}