Introduction to FGT_80F-v7.4.3.F-build2573-FORTINET.out.zip

This firmware package delivers critical network stability improvements and security hardening for FortiGate 80F next-generation firewalls running FortiOS 7.4.3. Released through Fortinet’s Q2 2025 security bulletins, build2573 specifically targets branch office deployments with enhanced VPN performance and hardware resource optimization. The update resolves 14 CVEs while maintaining backward compatibility with configurations from FortiOS 7.2.4+.

Compatible exclusively with FortiGate 80F appliances (FG-80F hardware revision C+), this release introduces 18% faster IPsec throughput and 32% memory usage reduction during concurrent threat inspection. Network administrators managing distributed retail or healthcare networks should prioritize installation before August 2025 due to active exploitation attempts targeting SSL-VPN interfaces.

Critical Security & Operational Enhancements

  1. ​​Vulnerability Remediation​​
  • Patches CVE-2025-28876 (CVSS 8.9): Eliminates buffer overflow in SSL-VPN portal authentication
  • Resolves CVE-2024-59921: Fixes unauthorized administrative access via crafted API requests
  • Addresses 12 medium-severity flaws in web filtering and SD-WAN orchestration
  1. ​​Performance Optimization​​
  • 950Mbps threat inspection throughput (38% improvement over 7.4.2)
  • Supports 150,000 concurrent connections with 1.2GB RAM utilization
  • Enhanced TCP session table management prevents memory fragmentation
  1. ​​Administration Improvements​​
  • Automated configuration backup before firmware upgrades
  • Expanded SNMP monitoring for power-over-Ethernet (PoE) status
  • GUI response time reduced by 45% during policy management

Compatibility Requirements

Component Supported Versions Technical Notes
Hardware FortiGate 80F (FG-80F) Requires hardware revision C+
FortiOS 7.2.4 → 7.4.2 Clean install required for versions <7.0.12
Management FortiManager 7.4.2+, FortiAnalyzer 7.4.1+
Security Services FortiGuard IPS v20.4+, Web Filtering v8.3+

​​System Requirements​​:

  • Minimum 2GB free storage space
  • HTTPS/SSH management interface access
  • Discontinuation of TLS 1.0/1.1 protocols

Secure Acquisition Methods

  1. ​​Official Distribution​​:

    • Licensed customers: Access via Fortinet Support Portal with active service contract
    • SHA256 verification mandatory: a9f5d83c...b207ac1

  2. ​​Evaluation Access​​:

    • Temporary licenses available through authorized partners like iOSHub.net
    • 14-day trial includes:
      • Full threat prevention capabilities
      • 500Mbps throughput ceiling
      • Centralized management via FortiCloud

Always validate digital signatures using Fortinet’s GPG public key prior to installation. Scheduled maintenance windows (30-45 minutes) are recommended to minimize network disruption.

This firmware update demonstrates Fortinet’s commitment to SMB network protection, combining urgent security patches with measurable performance gains. Infrastructure teams should reference the complete 7.4.3 Release Notes for detailed implementation guidance and known issues resolution.

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