Thanks Gerald,I have just installed this version 'openssl-0.9.6e.tar.gz' and had assumed my stunnel was now secured.
After checking as reccomended:
ssh into your RaQ and issue [admin admin]$ openssl OpenSSL> version OpenSSL 0.9.6e 30 Jul 2002 OpenSSL> quit
the response given on our box was:
0.9.6b [engine] 9 Jul 2001