Cross-site scripting (XSS) vulnerability in gnatsweb.pl in Gnatsweb 4.00 and Gnats 4.1.99 allows remote attackers to inject arbitrary web script or HTML via the database parameter.
gen-index in GNATS 4.0, 4.1.0, and possibly earlier versions, when installed setuid, does not properly check files passed to the -o argument and opens the file with write access, which allows local users to overwrite arbitrary files.
Format string vulnerability in misc.c in GNU GNATS 4.00 may allow remote attackers to execute arbitrary code via format string specifiers in a string that gets logged by syslog.