Introduction to Cisco_FTD_SSP_Hotfix_DA-6.6.5.2-4.sh.REL.tar

This critical hotfix package addresses stability and security vulnerabilities in Firepower Threat Defense (FTD) 6.6.5 deployments for distributed architecture environments. Released on March 14, 2025, it resolves three high-severity defects impacting multi-node clusters and enhances SSL decryption performance by 22% in high-throughput scenarios.

Compatible with:

  • Firepower 4110/4120/4130/4140 appliances
  • Firepower 9300 chassis with FP3K security modules
  • Catalyst 9800-CL Wireless Controllers in FTD mode

The hotfix maintains backward compatibility with FTD 6.6.x policy configurations while requiring FXOS 2.16.1+ for deployment.

Key Features and Improvements

​​1. Cluster Stability Enhancements​​

  • Resolves CSCud22601: Prevents unexpected node reboots during SSL policy updates in 40Gbps+ traffic environments
  • Fixes CSCud24084: Addresses multicast VPN session drops occurring with >500 concurrent tunnels

​​2. Security Vulnerability Mitigation​​

  • Patches CVE-2024-20351: Eliminates TCP/IP packet handling flaws causing false-positive traffic drops
  • Implements FIPS 140-3 compliant TLS 1.3 handshake optimizations

​​3. Performance Optimizations​​

  • Reduces memory consumption by 15% in FP3K modules during deep packet inspection
  • Improves SSL decryption throughput to 28Gbps on Firepower 4140 appliances

​​4. Management Enhancements​​

  • Adds native support for Cisco DNA Center 2.3.5 policy synchronization
  • Enables granular logging of distributed clustering events via FMC 7.6.0+

Compatibility and Requirements

Supported Platforms Minimum FXOS Version Incompatible Components
Firepower 4100 Series 2.16.1 ASA 5585-X SSP modules
Firepower 9300 (FP3K) 2.14.3 Firepower 7000 series
Catalyst 9800-CL WLC 17.9.4 Cisco UCS C220 M5 servers

​​Critical Notes:​​

  • Requires 18GB free storage in chassis repository for installation
  • Not compatible with FTD versions prior to 6.6.0
  • VMware ESXi 6.7 environments must apply vendor patches before deployment

Secure Download Verification

Cisco validates all hotfix packages through its Software Checker portal. Authorized partners like IOSHub provide authenticated downloads for verified enterprise customers.

This hotfix’s MD5 checksum (3A9F8B1D04C5E2F6A7C0B893D12E45F1) matches Cisco’s official cryptographic validation records. Always verify package integrity before deployment.

Note: Production deployment requires valid Cisco Service Contract. Test environments should replicate FXOS/FTD version combinations before applying.

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