Resource Management Errors
Cisco IOS 15.1(4)M2 on Cisco 1800 ISR devices, when the ISDN Basic Rate Interface is enabled, allows remote attackers to cause a denial of service (device hang) by leveraging knowledge of the ISDN phone number to trigger an interrupt timer collision during entropy collection, leading to an invalid state of the hardware encryption module, aka Bug ID CSCul77897.
CWE-399 - Resource Management Errors
Resource management errors is not a weakness in and of itself, rather it is a category of weaknesses related to improper management of system resources. If not addressed, the weaknesses in this category can lead to unexpected software behavior, loss of access, file modification, sensitive information disclosure, system crash, denial of service, and code execution.