The management interface in ZyNOS firmware 3.62(WK.6) on the Zyxel Zywall 2 device allows remote authenticated administrators to cause a denial of service (infinite reboot loop) via invalid configuration data. NOTE: this issue might not cross privilege boundaries, and it might be resultant from CSRF; if so, then it should not be included in CVE.
https://exchange.xforce.ibmcloud.com/vulnerabilities/35941
http://www.securityfocus.com/archive/1/476031/100/0/threaded
http://www.louhi.fi/advisory/zyxel_070810.txt