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.
In Xymon through 4.3.28, a stack-based buffer overflow vulnerability exists in the alert acknowledgment CGI tool because of expansion in acknowledge.c.
In Xymon through 4.3.28, a stack-based buffer overflow vulnerability exists in the history viewer component via a long hostname or service parameter to history.c.
Directory traversal vulnerability in the trend-data daemon (xymond_rrd) in Xymon 4.x before 4.3.12 allows remote attackers to delete arbitrary files via a .. (dot dot) in the host name in a "drophost" command.
Multiple cross-site scripting (XSS) vulnerabilities in the Web UI in Xymon before 4.3.1 allow remote attackers to inject arbitrary web script or HTML via unspecified vectors.