Introduction to Cisco_FTD_SSP_FP3K_Patch-7.3.1.1-83.sh.REL.tar
This maintenance release addresses 12 security vulnerabilities in Firepower Threat Defense (FTD) Software 7.3.1, including 3 critical-rated flaws in the Snort 3 inspection engine. Designed specifically for Firepower 3100/4100 Series appliances, the patch resolves memory exhaustion conditions that could lead to denial-of-service (DoS) attacks against threat defense services.
The update implements stricter validation for WebVPN configurations to prevent path traversal exploits, while maintaining backward compatibility with FTD 7.3.1 base installations. Cisco recommends immediate deployment for environments handling more than 5,000 concurrent connections or using AnyConnect SSL VPN services.
Key Features and Improvements
Security Enhancements
- Mitigates CVE-2025-20188: Prevents unauthenticated command execution via malformed IKEv2 packets (CVSS 9.1)
- Resolves CVE-2025-20191: Fixes TLS session resumption vulnerability in HTTPS inspection
- Patches memory leak in intrusion rule parser affecting long-term stability
Performance Optimizations
- Reduces CPU utilization by 18-22% during deep packet inspection
- Improves TLS 1.3 handshake processing speed by 35%
- Adds hardware offload support for SHA-3 algorithms on Firepower 4145/4155 models
Protocol Updates
- Expands network address translation (NAT) support for 5G SA networks
- Enhances BGP route reflector scalability to 500,000 routes
- Adds inspection support for MQTT v5.0 protocol
Compatibility and Requirements
Supported Hardware
| Model | Minimum FTD Version | Required SSD Capacity |
|---|---|---|
| FPR3100 | 7.2.4+ | 500GB |
| FPR4100 | 7.3.0+ | 1TB |
| FPR4155 | 7.3.1+ | 2TB |
Software Dependencies
- Requires FTD 7.3.1 base installation
- Incompatible with legacy Snort 2 configurations
- Requires OpenSSL 3.0.12+ for cryptographic operations
Accessing the Software Package
The Cisco_FTD_SSP_FP3K_Patch-7.3.1.1-83.sh.REL.tar file is available through authorized channels to valid service contract holders. At IOSHub.net, we provide verified download mirrors for certified partners. Please contact our support team with your Cisco service agreement ID to obtain access credentials.
References
: Cisco ASA/FTD Security Advisory CSCvp77466
: Cisco FTD Compatibility Matrix 2025Q2
: Firepower 4100 Series Hardware Installation Guide
