On Sat, Apr 30, 2016 at 08:59:46PM +0000, Matt Caswell via RT wrote:
> 
> This is not a bug in OpenSSL. The problem here is that the server is behaving
> incorrectly when receiving large ClientHello messages. The ClientHello is the
> first message that is sent from the client to the server. If a large
> ClientHello is received then the server just hangs. The reason that this
> impacts TLSv1.2 and not other versions is that there are more ciphersuites
> available for that protocol version and therefore the ClientHello is bigger.

This is a know problem in old versions of F5 BIG-IP product.

See:
https://support.f5.com/kb/en-us/solutions/public/14000/700/sol14758.html


Kurt


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