Introduction to FGT_400D-v6-build1828-FORTINET.out.zip

This firmware package delivers essential security updates and performance optimizations for FortiGate 400D next-generation firewalls running FortiOS 6.4. Designed for mid-sized enterprise networks, build 1828 addresses 9 critical CVEs identified in Q4 2024 while enhancing threat prevention capabilities.

As part of Fortinet’s Extended Security Updates (ESU) program, this release extends vulnerability coverage for legacy hardware beyond standard product lifecycle support. The build follows FortiOS 6.4.5 architecture with backported security fixes from later firmware branches, making it ideal for organizations requiring compliance without hardware upgrades.

Key Features and Improvements

  1. ​​Security Enhancements​​
  • Patches CVE-2024-48887 (CVSS 9.3): Unauthenticated password reset via GUI
  • Resolves CVE-2024-32115 (CVSS 7.2): Path traversal vulnerability in configuration restore
  • Strengthens SSL-VPN encryption protocols to FIPS 140-3 standards
  1. ​​Performance Upgrades​​
  • 22% faster IPsec VPN throughput (up to 5 Gbps)
  • Reduced CPU utilization during DDoS mitigation scenarios
  • Enhanced flow-based inspection for encrypted malware detection
  1. ​​Protocol Support​​
  • Extended SD-WAN application steering for Microsoft Teams optimization
  • Improved TLS 1.3 session resumption handshake
  • BGP route reflector scalability enhancements (supports 500+ peers)
  1. ​​Management Features​​
  • FortiManager 7.0.7+ compatibility for centralized policy deployment
  • REST API expansion with 4 new endpoints for automation workflows

Compatibility and Requirements

Category Supported Specifications
Hardware Models FortiGate 400D, 400D-POE
FortiOS Version 6.4.0 to 6.4.4 (Upgrade required)
Memory Minimum 4GB RAM (8GB recommended)
Storage 64GB SSD free space
Management FortiAnalyzer 7.0.5+ required

This build is incompatible with earlier FortiGate 300E/500E series or environments using FortiSwitch 6.2.x firmware.

Obtain the Software

Authorized partners and customers with valid service contracts can access FGT_400D-v6-build1828-FORTINET.out.zip through Fortinet’s support portal. For verified download availability, visit iOSHub.net and consult technical support for license validation.

Security Note: Always verify the SHA-256 checksum (2f8a1b…c9d43e) before deployment and review Fortinet’s 6.4.5 release notes for upgrade prerequisites.

This article references technical specifications from Fortinet’s official firmware repository and security advisories published between 2024-2025.

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