CVE-2009-1165: Cisco Catalyst 3750g

High severity, CVSS 7.8. EPSS: 1.6% chance of exploitation in the next 30 days.

Memory leak on the Cisco Wireless LAN Controller (WLC) platform 4.x before 4.2.205.0, 5.1 before 5.1.163.0, and 5.0 and 5.2 before 5.2.178.0, 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 (memory consumption and device reload) via SSH management connections, aka Bug ID CSCsw40789.

Affected products

• Cisco Catalyst 3750g: any version
• Cisco Cisco 1500 Wireless Lan Controller: version 4.1 only; version 4.1m only; version 4.2 only; version 5.0 only; version 5.1 only; version 5.2 only
• Cisco Cisco 2000 Wireless Lan Controller: version 4.1 only; version 4.1m only; version 4.2 only; version 5.0 only; version 5.1 only; version 5.2 only
• Cisco Cisco 2100 Wireless Lan Controller: version 4.1 only; version 4.1m only; version 4.2 only; version 5.0 only; version 5.1 only; version 5.2 only
• Cisco Cisco 4100 Wireless Lan Controller: version 4.1 only; version 4.1m only; version 4.2 only; version 5.0 only; version 5.1 only; version 5.2 only
• Cisco Cisco 4200 Wireless Lan Controller: version 4.1 only; version 4.1m only; version 4.2 only; version 5.0 only; version 5.1 only; version 5.2 only
• Cisco Cisco 4400 Wireless Lan Controller: version 4.1 only; version 4.1m only; version 4.2 only; version 5.0 only; version 5.1 only; version 5.2 only

Published 2009-07-29. Last modified 2026-06-16.