An Improper Restriction of Excessive Authentication Attempts issue was discovered in Moxa OnCell G3110-HSPA Version 1.3 build 15082117 and previous versions, OnCell G3110-HSDPA Version 1.2 Build 09123015 and previous versions, OnCell G3150-HSDPA Version 1.4 Build 11051315 and previous versions, OnCell 5104-HSDPA, OnCell 5104-HSPA, and OnCell 5004-HSPA. An attacker can freely use brute force to determine parameters needed to bypass authentication.