Unknown vulnerability in ScreenOS in Juniper Networks NetScreen firewall 3.x through 5.x allows remote attackers to cause a denial of service (device reboot or hang) via a crafted SSH v1 packet.
https://exchange.xforce.ibmcloud.com/vulnerabilities/16876
http://www.securityfocus.com/bid/10854
http://www.kb.cert.org/vuls/id/749870
http://www.juniper.net/support/security/alerts/screenos-sshv1-2.txt