The CBounceDCCMod::OnPrivCTCP function in bouncedcc.cpp in the bouncedcc module in ZNC 0.200 and 0.202 allows remote attackers to cause a denial of service (crash) via a crafted DCC RESUME request.
https://github.com/znc/znc/commit/11508aa72efab4fad0dbd8292b9614d9371b20a9#modules/bouncedcc.cpp
http://www.securityfocus.com/bid/51328
http://www.openwall.com/lists/oss-security/2012/01/10/1
http://secunia.com/advisories/47387
http://lists.opensuse.org/opensuse-updates/2015-11/msg00023.html