CVE-2017-16875

An issue was discovered in Teluu pjproject (pjlib and pjlib-util) in PJSIP
before 2.7.1. The ioqueue component may issue a double key unregistration
after an attacker initiates a socket connection with specific settings and
sequences. Such double key unregistration will trigger an integer overflow,
which may cause ioqueue backends to reject future key registrations.