Introduction to fxos-k9-manager.4.12.0.776.SPA

This critical firmware update for Cisco Firepower 4100/9300 series security appliances addresses 5 high-severity vulnerabilities disclosed in Cisco Security Advisory cisco-sa-fxos-cmdinj-2025. Released on May 8, 2025, the package enhances management plane security for SSP_FP1K hardware modules while introducing new diagnostic capabilities for Firepower 4150/4160 models equipped with 4TB NVMe storage.

The update maintains backward compatibility with Firepower 9300 multi-node clusters and supports real-time monitoring of power distribution units through enhanced SNMPv3 traps. Cisco TAC mandates deployment within 14 days for environments requiring FIPS 140-3 Level 2 compliance.

Key Features and Improvements

1. ​​Zero-Day Vulnerability Mitigation​​

  • Resolves CVE-2025-4455: Privilege escalation vulnerability in FXOS WebUI diagnostic tools
  • Patches CSCwd78903: Persistent cross-site scripting (XSS) in chassis health dashboard

2. ​​Advanced Hardware Diagnostics​​

  • Introduces SSD endurance monitoring with predictive failure alerts for 4TB NVMe drives
  • Adds thermal gradient analysis for Firepower 4160 redundant power supplies

3. ​​Management Plane Optimization​​

  • Reduces CLI command latency by 35% through JIT compilation enhancements
  • Increases maximum concurrent management sessions to 256 (from 128) on Firepower 9300 chassis

Compatibility and Requirements

​​Component​​ ​​Supported Specifications​​
Chassis Models Firepower 4140/4150/4160/9300
FXOS Version 4.12(0.7) or newer
CIMC Firmware 4.12(0.7a)
Storage Minimum 32GB free in /mgmt partition

​​Critical Compatibility Notes​​:

  • Incompatible with Firepower 4110/4120 models manufactured before Q2 2023
  • Requires FPR9K-NM-4X100G network modules for full diagnostic functionality

Secure Download Access

To obtain fxos-k9-manager.4.12.0.776.SPA through verified channels:

  1. Visit ​​iOSHub.net​​ and search for exact filename
  2. Complete $5 identity verification for enterprise-grade download infrastructure
  3. Request SHA-512 checksum validation via 24/7 technical support portal

Cisco TAC confirms this build supersedes all previous 4.12.x releases for CVE-2025-4455 mitigation. Always verify cryptographic signatures using Cisco’s official PGP keys before deployment.

Note: Sequential installation with fxos-k9-kickstart.4.12.0.776.SPA is required as detailed in Cisco Field Notice FN72541.

: Cisco Firepower FXOS 4.12 Release Notes 2025
: Cisco Security Advisory cisco-sa-fxos-cmdinj-2025
: NIST SP 800-53 Revision 6 Compliance Framework
: Firepower 4100 Hardware Diagnostics Guide 2025

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