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Vulnerability record · CVE-2005-3774 · published 23 November 2005

CVE-2005-3774: Cisco pix vulnerability

Cisco · Pix

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.

5.0 CVSS 2.0 Medium EPSS 18% · top 2.9%
5.0CVSS 2.0 base score
18%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
32References
16 Jun 2026Last modified by NVD

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.

AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lists.grok.org.uk/pipermail/full-disclosure/2005-November/038971.html Vendor Advisory
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 US Government Resource
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
http://www.securityfocus.com/bid/15525
http://www.vupen.com/english/advisories/2005/2546
https://exchange.xforce.ibmcloud.com/vulnerabilities/25077
https://exchange.xforce.ibmcloud.com/vulnerabilities/25079
http://lists.grok.org.uk/pipermail/full-disclosure/2005-November/038971.html Vendor Advisory
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 US Government Resource
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
http://www.securityfocus.com/bid/15525
http://www.vupen.com/english/advisories/2005/2546
https://exchange.xforce.ibmcloud.com/vulnerabilities/25077
https://exchange.xforce.ibmcloud.com/vulnerabilities/25079

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2007-2462Cisco pix vulnerabilityUnspecified vulnerability in Cisco Adaptive Security Appliance (ASA) and PIX 7.2 before 7.2(2)8, when using Layer 2 Tunneling Protocol (L2TP) or Remo…EPSS 6.5%7.8CVE-2009-1155Cisco adaptive security appliance 5500 improper authentication vulnerabilityCisco Adaptive Security Appliances (ASA) 5500 Series and PIX Security Appliances 7.1(1) through 7.1(2)82, 7.2 before 7.2(4)27, 8.0 before 8.0(4)25, a…EPSS 1.9%7.8CVE-2009-1157Cisco adaptive security appliance 5500 vulnerabilityMemory leak on Cisco Adaptive Security Appliances (ASA) 5500 Series and PIX Security Appliances 7.0 before 7.0(8)6, 7.1 before 7.1(2)82, 7.2 before 7…EPSS 2.7%7.8CVE-2009-1158Cisco adaptive security appliance 5500 vulnerabilityUnspecified vulnerability on Cisco Adaptive Security Appliances (ASA) 5500 Series devices 7.0 before 7.0(8)6, 7.1 before 7.1(2)82, 7.2 before 7.2(4)2…EPSS 1.9%7.8CVE-2009-1159Cisco adaptive security appliance 5500 vulnerabilityUnspecified vulnerability on Cisco Adaptive Security Appliances (ASA) 5500 Series and PIX Security Appliances 7.2 before 7.2(4)26, 8.0 before 8.0(4)2…EPSS 1.9%7.8CVE-2008-2732Cisco adaptive security appliance 5500 vulnerabilityMultiple unspecified vulnerabilities in the SIP inspection functionality in Cisco PIX and Adaptive Security Appliance (ASA) 5500 devices 7.0 before 7…EPSS 3.4%7.8CVE-2007-2461Cisco pix vulnerabilityThe DHCP relay agent in Cisco Adaptive Security Appliance (ASA) and PIX 7.2 allows remote attackers to cause a denial of service (dropped packets) vi…EPSS 4.4%7.8CVE-2007-2463Cisco pix vulnerabilityUnspecified vulnerability in Cisco Adaptive Security Appliance (ASA) and PIX 7.1 before 7.1(2)49 and 7.2 before 7.2(2)17 allows remote attackers to c…EPSS 2.9%

Source: NIST National Vulnerability Database (record CVE-2005-3774), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.