Resource Management Errors
query_params.cpp in cxxtools before 2.2.1 allows remote attackers to cause a denial of service (infinite recursion and crash) via an HTTP query that contains %% (double percent) characters.
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.