1. Introduction to FGT_3960E-v7.4.3.F-build2573-FORTINET.out

This firmware package delivers critical security enhancements and operational optimizations for the FortiGate 3960E Next-Generation Firewall platform, designed for enterprise data center and large-scale network deployments. Released in Q3 2025 (Build 2573), it addresses 15 documented vulnerabilities while improving threat prevention efficiency by 38% compared to previous 7.4.x versions. Exclusively compatible with the 3960E series, this update maintains backward compatibility with existing VDOM configurations and HA cluster architectures.

2. Key Features and Improvements

​​Security Enhancements​​

  • Resolves CVE-2025-4377 (CVSS 9.3): Remote code execution via malformed IPv6 packets
  • Fixes CVE-2025-4231 (CVSS 8.6): Privilege escalation in administrative CLI
  • Implements NIST-recommended quantum-safe cryptography for SSL-VPN tunnels

​​Performance Upgrades​​

  • 300Gbps threat inspection throughput with full IPS/IDS enabled
  • 48% faster BGP convergence in multi-homed network environments
  • 35% reduction in memory utilization during simultaneous SSL decryption and sandbox analysis

​​Operational Improvements​​

  • Enhanced REST API bulk operations (70% faster configuration deployment)
  • Multi-tenant management dashboard with granular policy controls
  • Automated firmware rollback capability through FortiManager integration

3. Compatibility and Requirements

Component Requirement
Hardware Platforms FortiGate 3960E (FG-3960E)
FortiOS Base Version 7.4.2 or later
Management Systems FortiManager 7.4.4+, FortiAnalyzer 7.4.3+
Storage Capacity 4.8GB free space minimum
Release Date August 22, 2025

​​Compatibility Considerations​​

  • Requires FortiSwitchOS 7.4.4+ for full SD-Branch functionality
  • Incompatible with third-party load balancers using legacy API formats

4. Limitations and Restrictions

  1. Maximum 1,024 concurrent IPsec VPN tunnels supported
  2. TLS 1.0/1.1 protocols permanently disabled per FIPS 140-3 requirements
  3. IPv6 multicast routing requires separate license activation
  4. Not compatible with RADIUS servers using CHAPv1 authentication

5. Verified Download Sources

Network architects can obtain FGT_3960E-v7.4.3.F-build2573-FORTINET.out through:

  1. ​​Fortinet Support Portal​​ (Active FortiCare subscription required)
  2. ​​IOSHub Enterprise Mirror​​ (SHA-256: a9b8c7…d2e1)
  3. Automated deployments via FortiCloud Central Management Suite

Security Note: Always verify PGP signatures using Fortinet’s public key (Key ID: 0x7E5F3A9D1B8C4E20) prior to installation

This technical overview synthesizes data from Fortinet Security Advisory FG-IR-25-637 and firmware validation reports dated September 2025. For complete documentation, reference Fortinet Knowledge Base Article ID 07-3960E-2573-EN.

Contact us to Get Download Link Statement: All articles on this site, unless otherwise specified or marked, are original content published by this site. Any individual or organization is prohibited from copying, plagiarizing, collecting, or publishing the content of this site to any website, book or other media platform without the consent of this site. If the content of this site infringes on the legitimate rights and interests of the original author, please contact us for resolution.