In Xymon through 4.3.28, a buffer overflow vulnerability exists in the csvinfo CGI script. The overflow may be exploited by sending a crafted GET request that triggers an sprintf of the srcdb parameter.
https://lists.debian.org/debian-lts-announce/2019/08/msg00032.html
https://github.com/svn2github/xymon/blob/master/branches/4.3.28/web/csvinfo.c