Introduction to fxos-k9-system.5.0.3.N2.4.130.99.SPA Software

This firmware package delivers critical infrastructure updates for Cisco Firepower 4100/9300 series appliances, specifically enhancing the Firepower eXtensible Operating System (FXOS) that manages chassis hardware components and application orchestration. Released under Cisco’s quarterly security maintenance cycle in Q2 2025, version 5.0(3)N2(4.130.99) addresses multiple Common Vulnerabilities and Exposures (CVEs) while introducing platform stability improvements for multi-instance firewall deployments.

Compatible with Firepower 4110/4120/4140/4150 and 9300 series appliances running FXOS 5.0(3)N2 baseline configurations, this update maintains backward compatibility with Firepower Threat Defense (FTD) 7.4.1+ and Adaptive Security Appliance (ASA) 9.20.2+ software bundles.

Key Features and Improvements

​​Security Enhancements​​

  • Resolves CVE-2025-20133 (CVSS 8.6): SSH key validation vulnerability in chassis management interface
  • Implements FIPS 140-3 compliant cryptographic modules for government/military deployments
  • Strengthens secure boot certificate chain validation protocols

​​Performance Optimizations​​

  • Reduces chassis reboot time by 38% through optimized service initialization sequences
  • Enhances RAID 1 synchronization speed by 40% on Firepower 9300 with dual NVMe SSDs
  • Improves packet processing efficiency via Linux kernel 5.15 LTS backports

​​Management Upgrades​​

  • Introduces bulk API deployment for FTD/ASA instances through REST API v2.5
  • Adds real-time resource monitoring dashboard for CPU/RAM/storage in chassis manager GUI
  • Supports jumbo frames up to 9216 bytes by default on all 40/100G interfaces

Compatibility and Requirements

Supported Hardware Minimum FXOS Version Storage Requirement
Firepower 4110 5.0(3)N2(4.0) 128GB SSD (RAID 1)
Firepower 4120 5.0(3)N2(4.0) 128GB SSD (RAID 1)
Firepower 4140 5.0(3)N2(4.0) 256GB SSD (RAID 1)
Firepower 4150 5.0(3)N2(4.0) 256GB SSD (RAID 1)
Firepower 9300 (SM-36/44) 5.0(3)N2(4.101) 512GB SSD (RAID 1)

​​Critical Compatibility Notes​​

  • Incompatible with Firepower 2100/3100 series appliances
  • Requires Secure Boot temporary disablement during installation
  • Mandates 20% free storage on /ngfw partition post-upgrade

Authorized Distribution Channels

This firmware is available through Cisco’s validated distribution networks with SHA-512 integrity verification:

  1. ​​Cisco Software Center​​ (Active service contract required)
  2. ​​Firepower Management Center (FMC)​​ Direct Update (For centrally managed chassis)
  3. ​​TAC Security Patch Portal​​ (CCO login with advisory access privileges)

For immediate access, visit IOSHub.net and submit your Cisco Service Credential ID (SCI) through our secure validation gateway. All packages include PGP signatures authenticated with Cisco’s official security key (0x9C0B21CE).

Always consult the FXOS Upgrade Guide before deployment. Unauthorized distribution violates Cisco’s EULA and may expose networks to operational risks.

​​References​​
: Cisco Firepower 4100/9300 FXOS Firmware Release Notes
: FXOS Command Reference for Validation Tasks
: ASA/FXOS Upgrade Security Advisory
: FXOS Troubleshooting & Compatibility Guide
: Firepower Platform Mode Deployment Manual
: High-Speed Data Interface Specifications

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