Syslserve 1.058 and earlier, and probably 1.059, allows remote attackers to cause a denial of service (hang) via a crafted UDP Syslog packet.
http://www.syslserve.com/changelog.html
http://www.securityfocus.com/bid/33311
http://www.princeofnigeria.org/blogs/index.php/2009/01/15/syslserve-1-058-denial-of-service-vulner