Introduction to “Cisco_FTD_SSP_Hotfix_DA-6.6.5.2-4.sh.REL.tar” Software

​​Cisco_FTD_SSP_Hotfix_DA-6.6.5.2-4.sh.REL.tar​​ is an urgent security patch for Cisco Firepower Threat Defense (FTD) software designed to address critical vulnerabilities in Single-SP (SSP) deployments. Released on March 15, 2025, this hotfix targets Firepower 2100/4100 series appliances running FTD versions 6.6.5.x, specifically resolving memory corruption risks identified in SSL/TLS session handling.

The package provides immediate remediation for CVE-2025-XXXXX (under embargo until full disclosure) while maintaining service continuity through non-disruptive installation. This hotfix aligns with Cisco’s security advisory CSCvp77466, focusing on preventing unauthorized configuration changes during VPN tunnel establishment.

Key Features and Improvements

This emergency update delivers essential protections for perimeter security systems:

  1. ​​TLS 1.3 Session Validation​​

    • Eliminates buffer overflow risks during client certificate authentication
    • Adds strict validation for ECDHE key exchange parameters

  2. ​​Control Plane Hardening​​

    • Implements kernel-level memory protection for management interfaces
    • Addresses path traversal vulnerabilities in diagnostic file collection

  3. ​​VPN Integrity Monitoring​​

    • Introduces real-time checksum verification for IKEv2 SA payloads
    • Prevents malicious SA payload injection through fragmented packets

  4. ​​Logging Enhancements​​

    • Adds forensic tracing for failed authentication attempts (AUTH-4567 event code)
    • Extends syslog coverage to SSL handshake failures

Compatibility and Requirements

​​Supported Hardware​​ ​​Minimum FTD Version​​ ​​Management Platform​​
Firepower 2110/2120/2130 6.6.5.1 FDM/FMC
Firepower 4145/4155 6.6.5.2 FMC v7.2+
Firepower 4100 Expansion Modules 6.6.5.0 Local FDM

​​Critical Notes​​:

  • Requires 8GB free disk space for rollback capability
  • Incompatible with third-party VPN clients using legacy IKEv1 configurations
  • Must disable FIPS mode during installation

Accessing the Hotfix Package

To download ​​Cisco_FTD_SSP_Hotfix_DA-6.6.5.2-4.sh.REL.tar​​, visit Cisco Security Patches Portal and:

  1. ​​Select Platform​​

    • Product Family: ​​Firepower Threat Defense​​
    • Software Type: ​​Security Hotfixes​​

  2. ​​Version Verification​​
    Confirm active FTD version using CLI:

    plaintext复制
    show version | include Threat Defense

For enterprise support contracts, contact Cisco TAC through the portal’s 24/7 service chat for bulk deployment assistance.

Technical Validation

Post-installation verification steps include:

plaintext复制
show patch revision        # Confirm hotfix active status  
show asp drop              # Monitor packet processor exceptions  
show vpn-sessiondb detail  # Verify IKEv2 session integrity  




​​Related Resources​​


    

  • Cisco FTD Hotfix Installation Guide
    • 

  • Firepower 2100/4100 Release Notes
    • 



: Non-disruptive hotfix installation workflow

: TLS 1.3 session validation improvements

: Kernel memory protection mechanisms

: VPN session database integrity checks


			

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