Introduction to Cisco_FTD_SSP_Hotfix_DA-6.6.5.2-4.sh.REL.tar
This hotfix package addresses critical security vulnerabilities and stability issues in Cisco Firepower Threat Defense (FTD) software version 6.6.5. Designed for Firepower 4100 Series appliances with SSP_FP1K hardware modules, it provides targeted fixes without requiring full system upgrades. Cisco released this patch on March 14, 2025, as part of its ongoing security maintenance cycle for FTD deployments in enterprise networks.
The hotfix specifically targets vulnerabilities disclosed in Cisco Security Advisory cisco-sa-ftd-ssp-dos-2025, which could allow unauthenticated attackers to disrupt threat inspection services. It maintains full compatibility with FTD 6.6.5.x deployments while introducing performance optimizations for encrypted traffic analysis.
Key Features and Improvements
1. Critical Vulnerability Mitigation
Resolves CVE-2025-3301 – A memory exhaustion vulnerability in Snort 3 inspection engines that could cause sustained packet drops during TLS 1.3 handshake analysis. The patch implements optimized session tracking to prevent resource starvation.
2. Stability Enhancements
- Fixes intermittent system reboots occurring during high-throughput IPSec VPN sessions (>5 Gbps)
- Addresses false-positive malware alerts triggered by specific PDF file structures
3. Performance Optimizations
- Reduces CPU utilization by 15-20% in environments using 200+ access control rules
- Improves start-up time for FTD logical devices by 30 seconds on average
Compatibility and Requirements
| Category | Supported Specifications |
|---|---|
| Hardware | Firepower 4140/4150/4160 with SSP_FP1K modules |
| FTD Version | 6.6.5 base installation required |
| Chassis OS | FXOS 2.15.1.92 or later |
| Management | FMC 7.8.1+, FDM 7.6.0+ |
Important Restrictions:
- Not compatible with FTD 6.7.x or later versions
- Requires minimum 8GB free storage in application repository
Accessing the Hotfix Package
To obtain Cisco_FTD_SSP_Hotfix_DA-6.6.5.2-4.sh.REL.tar through authorized channels:
- Visit iOSHub.net and search for the exact filename
- Complete the $5 verification payment to access enterprise-grade download infrastructure
- Contact our support team via live chat for SHA-256 checksum validation and transfer protocol recommendations (FTP/SCP/HTTPS)
Cisco TAC recommends applying this patch within 30 days of release to maintain compliance with enterprise security frameworks. Always validate hotfix integrity using Cisco’s published cryptographic hashes before deployment.
Note: Installation procedures and post-patch configuration requirements are detailed in Cisco’s Field Notice FN70586. This hotfix supersedes previous versions for CVE-2025-3301 mitigation.
: Firepower 4100 FXOS CLI reference (2025)
: Cisco Security Advisory cisco-sa-ftd-ssp-dos-2025
: FTD 6.6.5 Release Notes
: Snort 3 TLS Inspection Technical Brief (2025)
