{"id":"CVE-2006-3906","aliases":["EUVD-2006-3900","GHSA-v43w-r88q-4mh9"],"status":"published","title":"Internet Key Exchange (IKE) version 1 protocol, as implemented on Cisco IOS, VPN 3000...","description":"Internet Key Exchange (IKE) version 1 protocol, as implemented on Cisco IOS, VPN 3000 Concentrators, and PIX firewalls, allows remote attackers to cause a denial of service (resource exhaustion) via a flood of IKE Phase-1 packets that exceed the session expiration rate. NOTE: it has been argued that this is due to a design weakness of the IKE version 1 protocol, in which case other vendors and implementations would also be affected.","severity":{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.06874,"percentile":0.94101,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"2006-07-27T22:00:00Z","modified":"2026-06-16T22:28:03Z","products":[{"vendor":"cisco","product":"adaptive_security_appliance_software"},{"vendor":"cisco","product":"ios"},{"vendor":"cisco","product":"pix_asa_ids"},{"vendor":"cisco","product":"pix_firewall"},{"vendor":"cisco","product":"pix_firewall_501"},{"vendor":"cisco","product":"pix_firewall_506"},{"vendor":"cisco","product":"pix_firewall_515"},{"vendor":"cisco","product":"pix_firewall_515e"},{"vendor":"cisco","product":"pix_firewall_520"},{"vendor":"cisco","product":"pix_firewall_525"},{"vendor":"cisco","product":"pix_firewall_535"},{"vendor":"cisco","product":"pix_firewall_software"},{"vendor":"cisco","product":"secure_pix_firewall"},{"vendor":"cisco","product":"vpn_3000_concentrator_series_software"},{"vendor":"cisco","product":"vpn_3001_concentrator"},{"vendor":"cisco","product":"vpn_3005_concentrator_software"},{"vendor":"cisco","product":"vpn_3015_concentrator"},{"vendor":"cisco","product":"vpn_3020_concentrator"},{"vendor":"cisco","product":"vpn_3030_concentator"},{"vendor":"cisco","product":"vpn_3060_concentrator"},{"vendor":"cisco","product":"vpn_3080_concentrator"}],"references":[{"url":"http://www.nta-monitor.com/posts/2006/07/cisco-concentrator-dos.html","tags":["x_refsource_MISC","x_transferred"]},{"url":"http://www.securityfocus.com/bid/19176","tags":["vdb-entry","x_refsource_BID","x_transferred"]},{"url":"http://www.securityfocus.com/archive/1/441203/100/0/threaded","tags":["mailing-list","x_refsource_BUGTRAQ","x_transferred"]},{"url":"http://www.osvdb.org/29068","tags":["vdb-entry","x_refsource_OSVDB","x_transferred"]},{"url":"http://archives.neohapsis.com/archives/bugtraq/2006-07/0531.html","tags":["mailing-list","x_refsource_BUGTRAQ","x_transferred"]},{"url":"https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5299","tags":["vdb-entry","signature","x_refsource_OVAL","x_transferred"]},{"url":"http://securitytracker.com/id?1016582","tags":["vdb-entry","x_refsource_SECTRACK","x_transferred"]},{"url":"http://securityreason.com/securityalert/1293","tags":["third-party-advisory","x_refsource_SREASON","x_transferred"]},{"url":"http://www.cisco.com/en/US/tech/tk583/tk372/tsd_technology_security_response09186a00806f33d4.html","tags":["vendor-advisory","x_refsource_CISCO","x_transferred"]},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/27972","tags":["vdb-entry","x_refsource_XF","x_transferred"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2006-3906"},{"url":"https://github.com/advisories/GHSA-v43w-r88q-4mh9"}],"sources":{"cve":[{"id":"CVE-2006-3906","description":"Internet Key Exchange (IKE) version 1 protocol, as implemented on Cisco IOS, VPN 3000 Concentrators, and PIX firewalls, allows remote attackers to cause a denial of service (resource exhaustion) via a flood of IKE Phase-1 packets that exceed the session expiration rate. NOTE: it has been argued that this is due to a design weakness of the IKE version 1 protocol, in which case other vendors and implementations would also be affected.","status":"published","published":"2006-07-27T22:00:00Z","modified":"2024-08-07T18:48:39.43Z","updated_at":"2026-11-02T14:33:49.62488Z"}],"euvd":[{"id":"EUVD-2006-3900","description":"Internet Key Exchange (IKE) version 1 protocol, as implemented on Cisco IOS, VPN 3000 Concentrators, and PIX firewalls, allows remote attackers to cause a denial of service (resource exhaustion) via a flood of IKE Phase-1 packets that exceed the session expiration rate. NOTE: it has been argued that this is due to a design weakness of the IKE version 1 protocol, in which case other vendors and implementations would also be affected.","status":"published","published":"2006-07-27T22:00:00Z","modified":"2024-08-07T18:48:39Z","updated_at":"2026-11-03T01:15:54.485555Z"}],"ghsa":[{"id":"GHSA-v43w-r88q-4mh9","title":"Internet Key Exchange (IKE) version 1 protocol, as implemented on Cisco IOS, VPN 3000...","description":"Internet Key Exchange (IKE) version 1 protocol, as implemented on Cisco IOS, VPN 3000 Concentrators, and PIX firewalls, allows remote attackers to cause a denial of service (resource exhaustion) via a flood of IKE Phase-1 packets that exceed the session expiration rate. NOTE: it has been argued that this is due to a design weakness of the IKE version 1 protocol, in which case other vendors and implementations would also be affected.","status":"published","published":"2022-05-01T07:13:23Z","modified":"2023-01-31T05:01:41Z","updated_at":"2026-11-02T14:48:06.842332Z"}],"nvd":[{"id":"CVE-2006-3906","description":"Internet Key Exchange (IKE) version 1 protocol, as implemented on Cisco IOS, VPN 3000 Concentrators, and PIX firewalls, allows remote attackers to cause a denial of service (resource exhaustion) via a flood of IKE Phase-1 packets that exceed the session expiration rate. NOTE: it has been argued that this is due to a design weakness of the IKE version 1 protocol, in which case other vendors and implementations would also be affected.","status":"published","published":"2006-07-27T22:04:00Z","modified":"2026-06-16T22:28:03.097Z","cvss":[{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:01:05.130518Z"}]}}