In lighttpd 1.4.63,65,66 mod_wstunnel does not initialize a handler function pointer if an invalid HTTP request (websocket handshake) is received. It leads to null pointer dereference which crashes the server. It could be used by an external attacker to cause denial of service condition.
Created lighttpd tracking bugs for this issue:
Affects: epel-all [bug 2126415]
Affects: fedora-all [bug 2126416]
This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.