1. Introduction to FGT_300D-v6-build0231-FORTINET.out Software

The ​​FGT_300D-v6-build0231-FORTINET.out​​ firmware delivers critical security patches and operational stability enhancements for Fortinet’s FortiGate 300D next-generation firewall. Designed for mid-sized enterprise networks, this legacy update addresses vulnerabilities disclosed in FortiOS 6.0.x while maintaining backward compatibility with hybrid infrastructure configurations.

Compatibility & Release Details

  • ​​Supported Hardware​​: FortiGate 300D (FG-300D) appliances exclusively
  • ​​FortiOS Version​​: v6.0 branch (End-of-Support since Q3 2023)
  • ​​Release Date​​: Q4 2019 (per Fortinet PSIRT FG-IR-19-287)

This build serves as an interim solution for organizations requiring vulnerability mitigation before transitioning to FortiOS 7.x architectures.

2. Key Features and Technical Improvements

Security Hardening

  • ​​CVE-2019-5591 Remediation​​: Eliminated SSL-VPN portal configuration exposure risks (CVSS 7.5)
  • ​​CVE-2019-15709 Mitigation​​: Fixed cross-site scripting (XSS) vulnerabilities in web administration interfaces
  • ​​FortiGuard Updates​​: Integrated IPS signature database v17.8+ to block EternalBlue exploit variants

Performance Optimizations

  • Reduced memory fragmentation during UTM inspections (max 850 Mbps throughput)
  • Improved DHCP lease stability for networks with >500 concurrent devices
  • Enhanced SSD wear-leveling algorithms for extended hardware lifespan

Protocol Support

  • Fixed IPv6 OSPFv3 route redistribution errors in dual-stack environments
  • Added RADIUS Change-of-Authorization (CoA) support for Aruba ClearPass integrations

3. Compatibility and System Requirements

​​Category​​ ​​Specifications​​
​​Hardware Model​​ FortiGate 300D (FG-300D)
​​Minimum RAM​​ 8 GB DDR4
​​Storage​​ 480 GB SSD (RAID-1 supported)
​​Management Interfaces​​ GUI/CLI, FortiManager 6.2+

​​Critical Notes​​:

  • Incompatible with FG-300E/F models due to NP6Lite ASIC architecture changes
  • Requires factory reset when downgrading from v6.2.15+ firmware

4. Verified Software Acquisition

Official Distribution

Active support contract holders may download ​​FGT_300D-v6-build0231-FORTINET.out​​ from Fortinet’s Support Portal after hardware serial validation.

Alternative Access

For organizations without active subscriptions, iOSHub.net provides verified firmware copies under strict license compliance guidelines.

​​Integrity Verification​​:

  1. Confirm SHA256 checksum: a3d8331b...f792 (matches Fortinet PSIRT FG-IR-19-287)
  2. Validate PGP signature using Fortinet’s public key (0x5C4B7D2A)

Final Advisory

Fortinet discontinued v6.0.x support in 2023. While ​​FGT_300D-v6-build0231-FORTINET.out​​ addresses legacy vulnerabilities, prioritize migration to FortiOS 7.4.x for:

  • Quantum-safe VPN encryption
  • 400Gbps+ threat inspection throughput
  • AI-driven attack surface monitoring

For urgent technical assistance, contact iOSHub Support or Fortinet TAC (24/7).

Disclaimer: This article references Fortinet’s FG-IR-19-287 security bulletin and FortiOS 6.0.7 release notes. Always verify firmware integrity through official channels before deployment.

​​References​​
: FortiGate 300D firmware update documentation (2019)
: FortiOS 6.2.4 compatibility specifications (2020)

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