Versions of OpenSSH prior to 3.7 contain a vulnerability in the general 
handling of buffers. This vulnerability appears to occur due to some 
buffer management errors. Specifically, this is an issue with freeing 
the appropriate memory size on the heap. In certain case the memory 
cleared is too large and might cause heap corruption.

http://www.kb.cert.org/vuls/id/333628

Affects: All FreeBSD releases after 4.0-RELEASE
FreeBSD 4-STABLE prior to the correction date
openssh port prior to openssh-3.6.1_1
openssh-portable port prior to openssh-portable-3.6.1p2_1

Will you need to update m0n0wall ?

Cheers

Phil Greenway