Loading
The administrative web interface on the Cisco Wireless LAN Controller (WLC) platform 4.x before 4.2.205.0 and 5.x before 5.2.191.0, as used in Cisco 1500 Series, 2000 Series, 2100 Series, 4100 Series, 4200 Series, and 4400 Series Wireless Services Modules (WiSM), WLC Modules for Integrated Services Routers, and Catalyst 3750G Integrated Wireless LAN Controllers, allows remote attackers to cause a denial of service (device reload) via a crafted (1) HTTP or (2) HTTPS request, aka Bug ID CSCsy27708.
Use Cisco vendor hub and Catalyst product page to widen CVE-2009-1166 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2009-0620, CVE-2009-0625 and CVE-2009-0623 for nearby disclosures in the same product family. Additional editorial context is available in The Weekly Cybersecurity Brief: February 13th, 2026.