CVE-2021-3690: Undertow buffer leak on incoming websocket PONG message may lead to DoS

Solution Verified - Updated -


  • java.lang.OutOfMemoryError: Direct buffer memory in the JBoss server log


  • Red Hat Enterprise Application Platform (EAP) 7.3.8
  • Red Hat Enterprise Application Platform (EAP) 7.4.0
  • Red Hat Single Sign-On (RHSSO) 7.4.8

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