The remote host is missing an update to the system as announced in the referenced advisory.
The following package is affected: bnc
CVE-2004-1052 Buffer overflow in the getnickuserhost function in BNC 2.8.9, and possibly other versions, allows remote IRC servers to execute arbitrary code via an IRC server response that contains many (1) ! (exclamation) or (2) @ (at sign) characters.
Solution: Update your system with the appropriate patches or software upgrades.