An anonymous reader writes: The IT community was shaken a few weeks ago when Juniper Networks firewalls were found to contain "unauthorized code" that seemed to enable a backdoor. Now, Fortinet firewalls have been found to contain an apparent SSH backdoor as well. "According to the exploit code, the undisclosed authentication works on versions 4.3 up to 5.0.7. If correct, the surreptitious access method was active in FortiOS versions current in the 2013 and 2014 time frame and possibly earlier, based on this rough release history. The weakness was eventually patched, but so far, researchers have been unable to locate a security advisory that disclosed the alternative authentication method or the hard-coded password." A spokesperson for Fortinet told El Reg, "This was not a 'backdoor' vulnerability issue but rather a management authentication issue."