Unspecified vulnerability in the Juniper Networks NetScreen Firewall products with ScreenOS before 6.3r17, when configured to use the internal DNS lookup client, allows remote attackers to cause a denial of service (crash and reboot) via vectors related to a DNS lookup.
http://secunia.com/advisories/59026
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10631