Kerio MailServer SYN flood denial of service

kerio-mailserver-syn-dos (9904) The risk level is classified as MediumMedium Risk


Kerio MailServer is vulnerable to a denial of service attack in multiple mail services. If a remote attacker sends multiple SYN packets to either the POP3, SMTP, Internet Message Access Protocol (IMAP), Secure IMAP, POP3S, Webmail, or Secure Webmail service, the attacker could cause the targeted service to stop responding. The service resumes normal functionality after a short period of time.


Denial of Service


Upgrade to Kerio MailServer 5.1.7 or later, released October 22, 2002 from the Kerio Technologies, Inc. Web site. See References.

If you cannot upgrade immediately, filter all mail services to restrict access to only trusted sources from within the network.


Platforms Affected:

  • Kerio Kerio MailServer 5.0


Aug 19, 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.

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