CVE-2006-4430

Severity: medium (CVSS 5.0 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2006-08-29 · updated 2026-06-16

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.

Affected products

Cisco Network Admission Control: through 3.6.4.1
Cisco Network Admission Control Manager And Server System Software: 3.3, 3.3.1, 3.3.2, 3.3.3, 3.3.4, 3.3.5 (+19)

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
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

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