Air-ct5500-k9-8-3-150-0 May 2026
Overview: Cisco Wireless LAN Controller Software
The filename air-ct5500-k9-8-3-150-0.aes (typically ending in .aes) represents a specific software release for the Cisco 5500 Series Wireless LAN Controllers (WLCs).
4. Security Patches (KRACK & FragAttacks)
This image includes backported fixes for KRACK (Key Reinstallation Attack) and pre-emptive hardening against FragAttacks, making it PCI-DSS compliant for controllers locked into the 8.3 train. air-ct5500-k9-8-3-150-0
Warning: Do not interrupt the upgrade; loss of power during image write can brick the controller. air-ct5500-k9-8-3-150-0
- Model Number: Air-CT5500-K9-8-3-150-0
- Device Type: Wireless controller
- Ports: 8 gigabit Ethernet ports
- Access Points Supported: Up to 150
- Wireless Standards: 802.11a/b/g/n/ac
- Security Features: 802.1x authentication, guest access, wireless intrusion detection and prevention
- Redundancy and High Availability: Supported