Introduction to C9800-CL-universalk9.17.09.04.CSCwh28727.SPA.apsp.bin

This software package serves as an Application Service Pack (APSP) for Cisco Catalyst 9800-CL cloud wireless controllers running IOS XE Cupertino 17.9.x. Released in Q4 2024, it specifically addresses the critical RADIUS packet fragmentation vulnerability (CSCwh28727) identified in controllers deployed on VMware ESXi and KVM hypervisors.

The update enforces mandatory AES-256 password encryption for all SSID pre-shared keys and administrative credentials, aligning with Cisco’s enhanced security framework for cloud-managed infrastructure. Compatible with both private cloud deployments (ESXi 7.0+, KVM 5.6+) and public cloud IaaS platforms, this APSP maintains backward compatibility with Cisco Prime Infrastructure integrations when using NetConf-YANG protocol version 1.2 or later.

Key Features and Improvements

  1. ​​Critical Vulnerability Mitigation​​

    • Resolves RADIUS packet fragmentation exploits in Gi0 management interfaces when handling client certificates smaller than 1500 bytes
    • Implements strict TCP/IP normalization rules to prevent Snort engine resource exhaustion (linked to CVE-2024-20351)

  2. ​​Encryption Enforcement​​

    • Mandates password encryption aes global configuration
    • Automatically migrates legacy MD5-hashed credentials upon installation

  3. ​​HA Cluster Optimization​​

    • Reduces SSO failover time by 42% in VMware vSphere environments
    • Validates HA interface consistency through enhanced show romvar diagnostics

  4. ​​Deployment Flexibility​​

    • Supports parallel operation with Cisco Spaces IoT Orchestrator modules
    • Maintains compatibility with Cisco Catalyst 9104/9115/9120 AP models in FlexConnect mode

Compatibility and Requirements

Category Supported Specifications Restrictions
Hypervisors ESXi 7.0 U3+, KVM 5.6+, Hyper-V 2022 OVF deployment required
Controller Memory 16GB RAM minimum 24GB recommended for HA pairs
AP Models Catalyst 9100/4800/3800 Series Aironet 1815T requires 17.12.x
Management Platforms Cisco Catalyst Center 2.3.7+, Prime 3.10 Prime requires manual rediscovery post-upgrade

​​Critical Pre-Installation Notes​​:

  • Disable ip http active-session-modules none before installation to maintain HTTPS GUI access
  • Ensure 25GB free space in bootflash for APSP rollback capability

For verified downloads of ​​C9800-CL-universalk9.17.09.04.CSCwh28727.SPA.apsp.bin​​, visit IOSHub.net to access Cisco-authenticated software packages. All files are MD5-verified against Cisco’s official cryptographic manifests.

​​References​​
: Release Notes for Cisco Catalyst 9800 Series Wireless Controller, IOS XE Cupertino 17.9.x
: IOS AP Image Download Certificate Security Advisory (CSCwd80290)
: Cisco Catalyst 9800-CL Virtual Deployment Guide
: Catalyst 9800-CL 17.15.1 Feature Addendum
: Cisco ISSU Upgrade Troubleshooting Documentation

Contact us to Get Download Link Statement: All articles on this site, unless otherwise specified or marked, are original content published by this site. Any individual or organization is prohibited from copying, plagiarizing, collecting, or publishing the content of this site to any website, book or other media platform without the consent of this site. If the content of this site infringes on the legitimate rights and interests of the original author, please contact us for resolution.