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Do stateful packet-filtering firewalls have vulnerabilities?

What types of attacks are stateful packet-filtering firewalls vulnerable to?

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The stateful packet filter firewall provides no protection whatsoever from an application layer attack. In order to be effective and address today's application layer attacks, firewalls must inspect the application layer traffic. This is the reason why today many stateful packet filter firewall vendors are adopting some form of application layer filtering. Also, recent statistics show that stateful packet filter firewalls are prone to denial-of-service attacks.

This was first published in June 2007

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