The remote host is missing an update to weechat announced via advisory DSA 1744-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201744-1

Sebastien Helleu discovered that an error in the handling of color codes in the weechat IRC client could cause an out-of-bounds read of an internal color array. This can be used by an attacker to crash user clients via a crafted PRIVMSG command. The weechat version in the oldstable distribution (etch) is not affected by this problem. For the stable distribution (lenny), this problem has been fixed in version 0.2.6-1+lenny1. For the testing distribution (squeeze), this problem will be fixed soon. For the unstable distribution (sid), this problem has been fixed in version 0.2.6.1-1. We recommend that you upgrade your weechat packages.