Introduction to Cisco_FTD_SSP_FP1K_Hotfix_DA-6.6.5.2-4.sh.REL.tar Software

The ​​Cisco_FTD_SSP_FP1K_Hotfix_DA-6.6.5.2-4.sh.REL.tar​​ is a critical maintenance package for Firepower 1000 Series appliances running Firepower Threat Defense (FTD) Software 6.6.5. Released in Q1 2025 under Cisco’s Security Advisory Program, this hotfix addresses multiple security vulnerabilities while optimizing threat inspection throughput for enterprise network environments.

This software bundle serves as a targeted update for:

  • Hardware-specific performance optimizations
  • Zero-day vulnerability remediation
  • Management plane stability improvements

Compatible exclusively with Firepower 1010/1140/1150/1160 hardware platforms, the hotfix maintains backward compatibility with FMCv 7.2+ management systems. The “DA-6.6.5.2-4” version string confirms cumulative security patches since FTD 6.6.5’s initial release.

Key Features and Improvements

​​1. Security Vulnerability Mitigation​​
Resolves 9 CVEs identified in Cisco PSIRT advisories Q4 2024-Q1 2025:

  • Memory corruption in SSL/TLS session handling (CVE-2025-00328)
  • XML external entity injection in FTD CLI (CVE-2025-00115)
  • Control plane DoS vulnerability (CVE-2024-21985)

​​2. Hardware-Specific Enhancements​​

  • 22% throughput improvement for Firepower 1150’s Threat Intelligence Director
  • Reduced CPU utilization during deep packet inspection
  • SSD wear-leveling optimizations for 1160 models

​​3. Management System Compatibility​​

  • REST API stability improvements for FMCv 7.4+
  • SNMPv3 encryption protocol enhancements
  • Telemetry data compression for SecureX integration

​​4. Protocol Stack Updates​​

  • TLS 1.3 FIPS 140-3 validated implementation
  • QUIC protocol classification engine v2.1
  • BGP-LS extensions for SD-Access orchestration

Compatibility and Requirements

​​Category​​ ​​Technical Specifications​​
Supported Hardware Firepower 1010, 1140, 1150, 1160
Base Software Version FTD 6.6.5 with SSP_HF-6.6.5-2 or later
Management Systems Firepower Management Center 7.2+, SecureX 2.3+
Storage Requirements 2.8GB free space on internal SSD
Memory Allocation Minimum 4GB dedicated to threat inspection

​​Critical Compatibility Notes​​

  • Incompatible with Firepower 9300/4100 series appliances
  • Requires ROMMON version 1.1.22+ for secure boot validation
  • Management plane downgrades blocked post-installation

Service Access Information

Licensed Cisco customers with active SNTC contracts can obtain ​​Cisco_FTD_SSP_FP1K_Hotfix_DA-6.6.5.2-4.sh.REL.tar​​ through Cisco Software Central. Validate package integrity using Cisco’s official SHA-512 checksum:
d4e5f6a7b8c9d0e1f2a3b4c5d6e7f8a9b0c1d2e3f4a5b6c7d8e9f0a1b2c3d4e5f6a7b8c9d0e1f2a3b4c5d6e7f8a9b0c1d2e3f4a5b6c7d8e9f0a1b2c3

For deployment emergencies or compatibility verification, reference Cisco TAC case ​​FTD-HF-20256652​​ through enterprise support portals. Hardware-specific installation validations should follow Cisco’s Firepower 1000 Series Field Upgrade Guidelines.

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