CVE-2005-3774

Severity: medium (CVSS 5.0 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 18.2% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2005-11-23 · updated 2026-06-16

Description

Cisco PIX 6.3 and 7.0 allows remote attackers to cause a denial of service (blocked new connections) via spoofed TCP packets that cause the PIX to create embryonic connections that that would not produce a valid connection with the end system, including (1) SYN packets with invalid checksums, which do not result in a RST; or, from an external interface, (2) one byte of "meaningless data," or (3) a TTL that is one less than needed to reach the internal destination.

Affected products

Cisco Pix: 6.3, 7.0

References

http://lists.grok.org.uk/pipermail/full-disclosure/2005-November/038971.html
http://lists.grok.org.uk/pipermail/full-disclosure/2005-November/038983.html
http://secunia.com/advisories/17670
http://securitytracker.com/id?1015256
http://www.cisco.com/en/US/products/hw/vpndevc/ps2030/products_security_notice09186a0080624a37.html
http://www.cisco.com/warp/public/707/cisco-response-20051122-pix.shtml
http://www.kb.cert.org/vuls/id/853540
http://www.osvdb.org/24140
http://www.securityfocus.com/archive/1/417458/30/0/threaded
http://www.securityfocus.com/archive/1/426989/100/0/threaded
http://www.securityfocus.com/archive/1/426991/100/0/threaded
http://www.securityfocus.com/archive/1/427041/100/0/threaded

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