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Vulnerability Score 5.0 5.0
CVE Id CVE-2002-0514
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



PF in OpenBSD 3.0 with the return-rst rule sets the TTL to 128 in the RST packet, which allows remote attackers to determine if a port is being filtered because the TTL is different than the default TTL.

Vulnerable Systems

Operating System

  • Openbsd 3.0


BID - 4401

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

XF - firewall-rst-fingerprint(8738)

Last Updated: 27 May 2016 10:36:57