Format string vulnerability in Huawei AR100 AR120 AR150 AR200 AR500 AR550 AR1200 AR2200 AR2500 AR3200 and AR3600 routers with software before V200R007C00SPC900 and NetEngine 16EX routers with software before V200R007C00SPC900 allows remote authenticated users to cause a denial of service via format string specifiers in vectors involving partial commands.