The IRC Protocol component in KVIrc 3.x and 4.x before r4693 does not properly handle \ (backslash) characters, which allows remote authenticated users to execute arbitrary CTCP commands via vectors involving \r and \40 sequences, a different vulnerability than CVE-2010-2451 and CVE-2010-2452.
bugs.gentoo.org/show_bug.cgi?id=330111
lists.fedoraproject.org/pipermail/package-announce/2010-July/044625.html
lists.fedoraproject.org/pipermail/package-announce/2010-July/044643.html
lists.opensuse.org/opensuse-security-announce/2010-08/msg00001.html
marc.info/?l=oss-security&m=128041011428629&w=2
openwall.com/lists/oss-security/2010/07/28/1
secunia.com/advisories/40727
secunia.com/advisories/40796
www.osvdb.org/66648
svn.kvirc.de/kvirc/changeset/4693
svn.kvirc.de/kvirc/ticket/858