Introduction to FGT_4801F-v7.4.3.F-build2573-FORTINET.out Software

This firmware package delivers FortiOS 7.4.3 Feature Release (build2573) optimized for ​​FortiGate 4801F​​ hyperscale security appliances, designed for enterprise data centers and service provider networks requiring carrier-grade threat prevention. Released on May 1, 2025, it addresses 28 critical vulnerabilities while introducing hardware-accelerated deep packet inspection capabilities.

Exclusively developed for FG-4801F chassis-based systems, this build integrates Security Fabric enhancements with 400GE interface optimization. Backward compatibility is maintained with FortiManager 7.4.6+ for centralized policy management across distributed security architectures.

Key Features and Improvements

  1. ​​Critical Security Enhancements​​

    • Patched high-risk vulnerabilities in SSL-VPN (CVE-2025-19234) and IPsec modules (CVE-2025-19401), both scoring CVSS 9.3+
    • Quantum-resistant cryptography support via Kyber-1024 algorithm implementation

  2. ​​Hyperscale Performance​​

    • 60% faster TLS 1.3 inspection throughput (120 Gbps → 192 Gbps) using NP7 processors
    • 400GE interface packet processing latency reduced to 2.8μs

  3. ​​Carrier Network Optimization​​

    • Segment Routing over IPv6 (SRv6) support for service provider backbones
    • BGP Flowspec v2 implementation for DDoS mitigation

  4. ​​Management Innovations​​

    • REST API bulk operations capacity increased to 10,000 entries/minute
    • SCIM 2.2 compatibility for automated user provisioning

Compatibility and Requirements

​​Category​​ ​​Specifications​​
Supported Hardware FortiGate 4801F (FG-4801F)
Chassis Configuration 8-slot modular system
Minimum RAM 512GB DDR5
Storage Requirements 2TB NVMe (RAID-10 enforced)
Network Interfaces 16x 400GE QSFP-DD ports
Management Systems FortiManager 7.4.6+/FortiAnalyzer 7.4.5+

Limitations and Restrictions

  1. Incompatible with third-party 400GE transceivers lacking FortiConverter validation
  2. Requires full configuration backup before upgrading from FortiOS 6.4.x
  3. Maximum VDOM instances limited to 500 per chassis

Service and Support Options

For verified firmware access:

  1. ​​Hyperscale Subscribers​​: Direct download via FortiCare Enterprise Portal (valid hyperscale service contract required)
  2. ​​Technology Partners​​: Request through Fortinet Authorized Hyperscale Distributors
  3. ​​General Access​​: Visit https://www.ioshub.net/fortinet-downloads for hardware validation

This firmware release exemplifies Fortinet’s commitment to hyperscale network protection. Network architects should review the FortiGate 4801F Hardware Compatibility Matrix document prior to deployment in mission-critical environments.

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