An invalid HTTP request (websocket handshake) may cause a `NULL`
pointer dereference in the wstunnel module.

For Debian 10 buster, this problem has been fixed in version
1.4.53-4+deb10u3.

We recommend that you upgrade your lighttpd packages.

For the detailed security status of lighttpd please refer to
its security tracker page at:

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: Read More