{"cve":"CVE-2006-3906","nvd":{"published":"2006-07-27T22:04:00.000","modified":"2026-06-16T22:28:03.097","status":"Modified","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.","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["http://archives.neohapsis.com/archives/bugtraq/2006-07/0531.html","http://securityreason.com/securityalert/1293","http://securitytracker.com/id?1016582","http://www.cisco.com/en/US/tech/tk583/tk372/tsd_technology_security_response09186a00806f33d4.html","http://www.nta-monitor.com/posts/2006/07/cisco-concentrator-dos.html"],"products":["cisco:adaptive_security_appliance_software","cisco:ios","cisco:pix_asa_ids","cisco:pix_firewall","cisco:pix_firewall_501","cisco:pix_firewall_506","cisco:pix_firewall_515","cisco:pix_firewall_515e","cisco:pix_firewall_520","cisco:pix_firewall_525","cisco:pix_firewall_535","cisco:pix_firewall_software","cisco:secure_pix_firewall","cisco:vpn_3000_concentrator_series_software","cisco:vpn_3001_concentrator","cisco:vpn_3005_concentrator_software","cisco:vpn_3015_concentrator","cisco:vpn_3020_concentrator","cisco:vpn_3030_concentator","cisco:vpn_3060_concentrator","cisco:vpn_3080_concentrator"],"source":"nvd","synced_at":"2026-10-19T19:42:44.451428143+00:00"},"epss":{"cve":"CVE-2006-3906","score":0.06874,"percentile":0.9406,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}