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Vulnerability Score 5.0 5.0
CVE Id CVE-2002-0515
Last Modified 05 Sep 2008 04:28:13
Published 12 Aug 2002 12:00:00
Confidentiality Impact PARTIAL PARTIAL
Integrity Impact NONE NONE
Availability Impact NONE NONE
Access Vector NETWORK
Access Complexity LOW
Authentication NONE



IPFilter 3.4.25 and earlier sets a different TTL when a port is being filtered than when it is not being filtered, which allows remote attackers to identify filtered ports by comparing TTLs.

Vulnerable Systems


  • Darren Reed Ipfilter 3.4.25


BID - 4403

BUGTRAQ - 20020331 packet filter fingerprinting(open but closed, closed but filtered)

XF - firewall-rst-fingerprint(8738)

Last Updated: 27 May 2016 10:36:57