Multiple buffer overflows in freeSSHd 1.2.1 allow remote authenticated users to cause a denial of service (crash) and execute arbitrary code via a long (1) open, (2) unlink, (3) mkdir, (4) rmdir, or (5) stat SFTP command.
https://exchange.xforce.ibmcloud.com/vulnerabilities/52434
http://www.securityfocus.com/archive/1/499486/100/0/threaded