CVE-2006-4430
CVE-2006-4430 is a medium-severity vulnerability in Cisco Network Admission Control with a CVSS 2.0 base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.
Key facts
- Severity: Medium (CVSS 2.0 base score 5.0)
- EPSS exploit prediction: 2% (77th percentile)
- Actively exploited: Not listed in CISA KEV
- Affected product: Cisco Network Admission Control
- Published:
- Last 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.
Frequently asked questions
- What is CVE-2006-4430?
- 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.
- How severe is CVE-2006-4430?
- CVE-2006-4430 has a CVSS 2.0 base score of 5.0, rated medium severity.
- Is CVE-2006-4430 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2006-4430?
- CVE-2006-4430 primarily affects Cisco Network Admission Control. In total, 26 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2006-4430?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2006-4430 published?
- CVE-2006-4430 was published on 2006-08-29 and last updated on 2026-06-16.
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
- http://www.securityfocus.com/archive/1/444501/100/0/threaded
- http://www.securityfocus.com/archive/1/444737/100/0/threaded
- http://www.securityfocus.com/bid/19726
Affected products (26)
- cpe:2.3:a:cisco:network_admission_control:*:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:network_admission_control_manager_and_server_system_software:3.3:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:network_admission_control_manager_and_server_system_software:3.3.1:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:network_admission_control_manager_and_server_system_software:3.3.2:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:network_admission_control_manager_and_server_system_software:3.3.3:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:network_admission_control_manager_and_server_system_software:3.3.4:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:network_admission_control_manager_and_server_system_software:3.3.5:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:network_admission_control_manager_and_server_system_software:3.3.6:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:network_admission_control_manager_and_server_system_software:3.3.7:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:network_admission_control_manager_and_server_system_software:3.3.8:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:network_admission_control_manager_and_server_system_software:3.3.9:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:network_admission_control_manager_and_server_system_software:3.4:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:network_admission_control_manager_and_server_system_software:3.4.1:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:network_admission_control_manager_and_server_system_software:3.4.2:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:network_admission_control_manager_and_server_system_software:3.4.3:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:network_admission_control_manager_and_server_system_software:3.4.4:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:network_admission_control_manager_and_server_system_software:3.4.5:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:network_admission_control_manager_and_server_system_software:3.5:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:network_admission_control_manager_and_server_system_software:3.5\(9\):*:*:*:*:*:*:*
- cpe:2.3:a:cisco:network_admission_control_manager_and_server_system_software:3.5.1:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:network_admission_control_manager_and_server_system_software:3.5.2:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:network_admission_control_manager_and_server_system_software:3.5.3:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:network_admission_control_manager_and_server_system_software:3.5.4:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:network_admission_control_manager_and_server_system_software:3.5.5:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:network_admission_control_manager_and_server_system_software:3.6.0.1:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:network_admission_control_manager_and_server_system_software:3.6.4.0.1:*:*:*:*:*:*:*
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