KildClient 3.1.0 does not validate strings before launching the program specified by the BROWSER environment variable, which might allow remote attackers to conduct argument-injection attacks via a crafted URL, related to prefs.c and worldgui.c.
https://security-tracker.debian.org/tracker/CVE-2017-17511
https://lists.debian.org/debian-lts-announce/2017/12/msg00013.html