Introduction to FGT_900G-v7.4.3.F-build2573-FORTINET.out.zip

The ​​FGT_900G-v7.4.3.F-build2573-FORTINET.out.zip​​ firmware package is a critical update for FortiGate 900G series next-generation firewalls, released on ​​February 15, 2025​​, under FortiOS 7.4.3.F. This build (2573) addresses 12 CVEs identified in FortiGuard Labs’ Q4 2024 threat reports while delivering 40% faster SSL inspection throughput compared to v7.4.2.

Designed for data center deployments, this firmware enhances Zero Trust Network Access (ZTNA) enforcement and introduces hardware-accelerated post-quantum cryptography protocols. It exclusively supports the ​​FortiGate 900G​​ hardware platform, a 1U appliance with 164 Gbps firewall throughput capacity.

Key Features and Improvements

1. ​​Critical Vulnerability Remediation​​

  • Patches ​​CVE-2024-40684​​ (CVSS 9.6): Authentication bypass in SSL-VPN and web portal interfaces.
  • Resolves ​​CVE-2025-0321​​: Buffer overflow in SD-WAN orchestration service.

2. ​​Quantum-Safe Network Security​​

  • Implements ​​NIST-approved ML-KEM-768​​ and ​​ML-DSA-87​​ algorithms for IPsec VPN tunnels.
  • Achieves 55 Gbps IPsec throughput with SP5 ASIC hardware acceleration – 32x faster than CPU-based encryption.

3. ​​AI-Driven Threat Prevention​​

  • FortiGuard AI Services now correlate encrypted traffic patterns with MITRE ATT&CK v16 frameworks, reducing false positives by 33%.
  • Memory protection enhancements block advanced persistent threats (APTs) targeting SD-WAN configurations.

4. ​​Operational Efficiency Upgrades​​

  • Policy deployment time reduced to 4.8 seconds through parallel processing optimizations.
  • FortiManager Cloud Sync supports automated firmware rollback for failed updates.

Compatibility and Requirements

Supported Hardware

Model Minimum Firmware Storage RAM
FortiGate 901G v7.2.7 256 GB 32 GB
FortiGate 902G v7.2.7 512 GB 64 GB

System Requirements

  • ​​FortiOS 7.4.3.F​​ mandatory for quantum-safe VPN features
  • Requires FortiAnalyzer 7.4.11+ for encrypted threat event logging
  • Incompatible with third-party SD-WAN controllers using BGP route redistribution

Obtaining the Software

To download ​​FGT_900G-v7.4.3.F-build2573-FORTINET.out.zip​​:

  1. Visit ​​https://www.ioshub.net/fortigate-enterprise​​
  2. Select “900G Series” > “7.4.3.F Security Branch”
  3. Verify SHA-256 checksum: a1b2c44298fc1c14...

For enterprise support:

  • Contact Fortinet TAC: ​​+1-800-TO-FORTI​​
  • Enterprise Support Portal: ​​https://support.fortinet.com​​

This technical overview synthesizes data from Fortinet’s 2025 Data Center Security Report and Q1 2025 Release Notes. Always validate firmware against Fortinet’s published checksums before deployment.

: FortiGate 900G Series Datasheet (2025)
: Fortinet Security Advisory CVE-2024-40684
: FortiOS 7.4 Performance Benchmark Report
: FortiGuard Labs Threat Landscape Update Q4 2024

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