The default_encrypt function in encrypt.c in IRC Services before 5.0.63, and 5.1.x before 5.1.7, allows remote attackers to cause a denial of service (daemon crash) via a long password. NOTE: some of these details are obtained from third party information.
Improper Input Validation The product receives input or data, but it does
not validate or incorrectly validates that the input has the
properties that are required to process the data safely and
correctly.