It was found in Undertow before 1.3.28 that with non-clean TCP close, the Websocket server gets into infinite loop on every IO thread, effectively causing DoS.
{ "cwe_ids": [ "CWE-835" ], "severity": "MODERATE", "github_reviewed_at": "2020-06-16T20:56:49Z", "nvd_published_at": null, "github_reviewed": true }