{"cve":"CVE-2006-4430","nvd":{"published":"2006-08-29T00:04:00.000","modified":"2026-06-16T22:29:05.050","status":"Modified","description":"The Cisco Network Admission Control (NAC) 3.6.4.1 and earlier allows remote attackers to prevent installation of the Cisco Clean Access (CCA) Agent and bypass local and remote protection mechanisms by modifying (1) the HTTP User-Agent header or (2) the behavior of the TCP/IP stack.  NOTE: the vendor has disputed the severity of this issue, stating that users cannot bypass authentication mechanisms.","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["http://archive.cert.uni-stuttgart.de/archive/bugtraq/2005/08/msg00200.html","http://www.cisco.com/en/US/products/ps6128/products_security_notice09186a00804fa82b.html","http://www.cisco.com/en/US/products/ps6128/tsd_products_security_response09186a008071d609.html","http://www.securityfocus.com/archive/1/408603/30/0/threaded","http://www.securityfocus.com/archive/1/444424/100/0/threaded"],"products":["cisco:network_admission_control","cisco:network_admission_control_manager_and_server_system_software"],"source":"nvd","synced_at":"2026-10-19T19:42:44.451428143+00:00"},"epss":{"cve":"CVE-2006-4430","score":0.01952,"percentile":0.80242,"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."]}