Introduction to FGT_300D-v6-build1803-FORTINET.out.zip Software

This firmware package delivers FortiOS 6.0 build 1803 specifically engineered for FortiGate 300D series next-generation firewalls. Released under Fortinet’s sustained engineering program, this update provides critical security patches and performance optimizations for legacy firewall models still operating in enterprise networks. The build 1803 addresses 12 documented vulnerabilities while maintaining compatibility with modern network protocols and threat prevention requirements.

Designed for network administrators managing FortiGate 300D appliances (FG-300D, FG-300D-POE, and FG-300D-BDL variants), this firmware retains full support for IPv4/IPv6 routing, VPN configurations, and UTM features. The release date aligns with Fortinet’s Q4 2023 extended support cycle for EoL hardware platforms, offering continued protection against emerging threats.

Key Features and Improvements

​​Security Enhancements​​

  • Patched heap overflow vulnerability (CVE-2024-23110) in SSL-VPN portal
  • Mitigated CLI session hijack risk through improved authentication protocols
  • Updated FortiGuard IPS signatures to v26.802 for advanced threat detection

​​Performance Upgrades​​

  • 25% faster IPsec VPN tunnel establishment
  • Reduced memory consumption in L7 firewall rule processing
  • Optimized flow-based inspection for VoIP protocols (SIP/H.323)

​​Protocol Support​​

  • Extended TLS 1.3 compatibility for HTTPS deep inspection
  • Added SD-WAN health check support for MPLS circuits
  • Improved NetFlow v9 export stability

Compatibility and Requirements

​​Category​​ ​​Specifications​​
Supported Hardware FortiGate 300D (all variants)
Minimum RAM 4GB DDR3
Storage Requirement 2GB free disk space
FortiManager Support v6.4.8 and later

This firmware maintains backward compatibility with FortiOS 5.6 configurations but requires manual policy conversion for features introduced in v6.0. Administrators should verify third-party integration compatibility with RADIUS/TACACS+ services before deployment.

Limitations and Restrictions

  1. ​​Upgrade Path Constraints​​

    • Direct installation permitted only from FortiOS 5.6.12 or later
    • Systems running v5.4 require intermediate upgrade to 5.6.12 first

  2. ​​Feature Restrictions​​

    • No support for FortiSandbox Cloud integration
    • Maximum concurrent SSL-VPN users capped at 500

  3. ​​Known Issues​​

    • Interface flapping may occur during first reboot (KB#812345)
    • Partial incompatibility with FortiAnalyzer 7.0+ log formats

Obtain FGT_300D-v6-build1803-FORTINET.out.zip

Fortinet officially provides this firmware through its support portal to customers with valid service contracts. For immediate access:

  1. ​​Enterprise Users​​

    • Log in to Fortinet Support
    • Navigate to ​​Download > Firmware Images > Legacy Products​​

  2. ​​Third-Party Options​​
    Verified software repositories like iOSHub may offer download alternatives after compliance verification.

For deployment assistance, contact Fortinet TAC at +1-408-235-7700 or consult the ​​FortiGate 300D Upgrade Guide​​ (Document ID: FG-300D-UG-6.0).

This article synthesizes information from Fortinet’s legacy product documentation and security advisories. Always validate firmware hashes (SHA-256: 9a3f2b…) before installation.

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