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When any remote tunnels are configured, there is a chance that PuTTY will crash (or do something else bad), mostly likely after user authentication (when tunnels are first set up). Increasing numbers of remote tunnels is likely to increase the likelihood of a crash. This affects both SSH-1 and SSH-2.
(This is due to
free()-ing of an uninitialised pointer in
the event logging code. Other than the errant
execution is not affected.)