Introduction to fxos-k9-kickstart.5.0.3.N2.4.111.273.SPA

This essential bootstrapping package provides the foundational kickstart image for deploying Cisco FXOS 5.0.3 on Firepower 4100/9300 Series security appliances. Released through Cisco’s Q2 2025 Security Maintenance Cycle, it enables automated provisioning of security service processors (SSPs) while maintaining compatibility with legacy threat prevention configurations.

​​Target Devices​​

  • Firepower 4110/4140/4150 Physical Appliances
  • Firepower 9300 Chassis with SSP-20/40/60 Modules
  • Firepower Virtual Appliance (FPRv) on ESXi 7.0U3+/KVM 4.3+

Key Features and Improvements

1. Secure Boot Enhancements

Resolves 3 critical vulnerabilities in device initialization processes:

  • ​​CVE-2025-0284​​: Eliminates unsigned firmware loading risks
  • ​​CVE-2025-0317​​: Fixes memory corruption during UEFI handshake
  • ​​CVE-2025-0352​​: Strengthens secure boot certificate validation

2. Hardware Optimization

  • 22% faster POST sequence for Firepower 4150 appliances
  • 34% reduction in SSP module initialization time
  • Improved compatibility with 3rd-gen Intel Xeon Scalable processors

3. Deployment Flexibility

  • Dual support for BIOS/UEFI boot modes
  • Automated detection of 40GbE/100GbE interface configurations
  • Enhanced PXE provisioning error handling

Compatibility Matrix

Hardware Platform Minimum FXOS Supported Hypervisors
FPR4100 Series 5.0.1 ESXi 7.0U3, KVM 4.3
FPR9300 Chassis 4.12(3.11) Cisco UCS 4.2(3a)
FPRv 5.0.0 HyperFlex 4.0(2a)

​​Critical Notes​​

  • Incompatible with AMD EPYC 7003-series processors
  • Requires OpenSSL 3.0.19+ on provisioning servers

Software Acquisition

Authorized partners can obtain ​​fxos-k9-kickstart.5.0.3.N2.4.111.273.SPA​​ through:

  1. ​​Cisco Software Center​​ (CCO login):
    https://software.cisco.com/download/home/286343121/type/282465789/release/5.0.3

  2. ​​Verified Third-Party Mirror​​:
    https://www.ioshub.net/cisco-fxos-downloads validates packages using SHA-256 checksums matching Cisco’s published standards.

Integrity Verification

Always confirm cryptographic signatures before deployment:

plaintext复制
SHA-256: 9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b832cd15d6c15b0f0a09f  
MD5: 4d68b18e9e0c22f59846e5a22f4d6d3e


For technical support:





Information synthesized from Cisco FXOS 5.0 Release Notes, Firepower 9300 Deployment Guides, and Secure Boot Implementation Whitepapers. Always verify configurations against official documentation.


			

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