Ultra VNC-3DES-is it secure

[pentestr <pentestr () gmail com>]

hi hackers,
I am doing a VA/PT for one our client and found one of the servers is 
using Ultra VNC. The ports (5800 & 5900) are open to Internet. Is it 
secure against Man in the middle attack?
Do I need to report this as a CRITICAL/HIGH security issue..

Thanks & Rgds.
P.T.


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