Air-ct5500-k9-8-3-150-0 May 2026

The image air-ct5500-k9-8-3-150-0.aes is a Cisco Wireless LAN Controller (WLC) software release version 8.3.150.0 for the 5500 Series Controller.

A useful piece of information:
This specific version (8.3.x) is a long-term stable "extended maintenance" release. However, be aware that 8.3.150.0 is an older build; Cisco recommends upgrading to the latest 8.3.x maintenance release (e.g., 8.3.152.0 or later) if staying on the 8.3 train, or moving to a newer recommended release like 8.5.182.0 or 8.10.x (depending on your APs and security requirements) due to bug fixes and security patches, including those for KRACK and FragAttacks vulnerabilities.

Key prerequisites before upgrading:

Quick command to check current version on your WLC:
show sysinfo

Would you like help with the upgrade procedure or feature support for this release? air-ct5500-k9-8-3-150-0

The Cisco 5500 controller entered the "End of Life" (EoL) cycle years ago, but tens of thousands remain operational in manufacturing, education, and healthcare. The challenge with EoL hardware is finding the last good software version.

8.3.150.0 is widely regarded as the "golden image" for the 5500 series. Here is why: The image air-ct5500-k9-8-3-150-0

From Cisco.com → Software → Wireless → 5500 Series Controller → choose version 8.3.150.0.