CVE-2013-1235: Cisco 2000 Wireless Lan Controller

Medium severity, CVSS 5.0. EPSS: 1.2% chance of exploitation in the next 30 days.

Cisco Wireless LAN Controller (WLC) devices do not properly address the resource consumption of terminated TELNET sessions, which allows remote attackers to cause a denial of service (TELNET outage) by making many TELNET connections and improperly ending these connections, aka Bug ID CSCug35507.

Affected products

• Cisco 2000 Wireless Lan Controller: any version
• Cisco 2100 Wireless Lan Controller: any version
• Cisco 2106 Wireless Lan Controller: affected versions not specified
• Cisco 2112 Wireless Lan Controller: affected versions not specified
• Cisco 2125 Wireless Lan Controller: affected versions not specified
• Cisco 2500 Wireless Lan Controller: affected versions not specified
• Cisco 2504 Wireless Lan Controller: affected versions not specified
• Cisco 4100 Wireless Lan Controller: any version
• Cisco 4400 Wireless Lan Controller: any version
• Cisco 4402 Wireless Lan Controller: any version
• Cisco 4404 Wireless Lan Controller: any version
• Cisco 5500 Wireless Lan Controller: affected versions not specified
• Cisco 7500 Wireless Lan Controller: affected versions not specified
• Cisco 8500 Wireless Lan Controller: affected versions not specified
• Cisco Airespace 4000 Wireless Lan Controller: any version
• Cisco Wireless Lan Controller: any version

Published 2013-05-04. Last modified 2026-06-16.