ZyXEL Prestige 642R malformed TCP packet denial of service

zyxel-tcp-packet-dos (9372) The risk level is classified as MediumMedium Risk


The ZyXEL Prestige 642R router is vulnerable to a denial of service attack. A remote attacker can send a TCP packet with the SYN and ACK flags set to block services on the router. If a TCP packet with the SYN and FIN flags are set, services on the router would become inaccessible for a short period of time.

Note: Services affected by this vulnerability include Telnet, FTP, and DHCP.


Denial of Service


No remedy available as of September 1, 2014.


Platforms Affected:

  • ZyXEL Prestige 342R


Jun 17, 2002

The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall the author/distributor (IBM Internet Security Systems X-Force) be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

For corrections or additions please email ignore thisxforceignore this@ignore thisus.ignore thisibm.comignore this

Return to the main page