ircII before 20210314 allows remote attackers to cause a denial of service (segmentation fault and client crash, disconnecting the victim from an IRC server) via a crafted CTCP UTC message.Referenceshttps://www.openwall.com/lists/oss-security/2021/03/24/2http://www.eterna.com.au/ircii/http://www.openwall.com/lists/oss-security/2021/03/30/4https://lists.debian.org/debian-lts-announce/2021/08/msg00022.htmlhttps://lists.debian.org/debian-lts-announce/2021/08/msg00023.html