CVE-2006-4430: The Cisco Network Admission Control (NAC) 3.6.4.1 and earlier allows remote attackers to prevent installati...

Security readout for executives and security teams

This is an old Cisco NAC/Clean Access report about interfering with agent installation. The concern is endpoint compliance controls might be avoided, but Cisco disputed the severity and said authentication cannot be bypassed. No CVSS score, KEV listing, or confirmed exploitation is provided. Exposure is mainly organizations still operating legacy Cisco NAC/Clean Access deployments at 3.6.4.1 or earlier. Modern environments without this discontinued-era NAC architecture are unlikely to be affected based on the provided sources. Prioritize only if legacy Cisco NAC/Clean Access remains in production. The business risk is control bypass uncertainty around endpoint admission, but severity and exploitability are disputed and unsupported by current exploitation evidence. Mitigation focus: Identify any remaining Cisco NAC or Clean Access deployments and versions.; Review Cisco advisory and security response for vendor-supported guidance.; Verify authentication enforcement does not depend solely on agent installation..

Prepared

Jun 29, 2026, 10:45 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.