Integer overflow

Integer underflow in the cleanstring function in ircstring.c in 1 IRCD-hybrid 7.2.2 and 7.2.3, 2 ircd-ratbox before 2.2.9, and 3 oftc-hybrid before 1.6.8, when flattenlinks is disabled, allows remote attackers to execute arbitrary code or cause a denial of service daemon crash via a LINKS command...