Introduction to FGT_400D-v6-build1364-FORTINET.out Software

This firmware package (FGT_400D-v6-build1364-FORTINET.out) delivers critical security and performance updates for FortiGate 400D series firewalls under FortiOS 6.4.12. Released in Q2 2025, it addresses 14 CVEs while optimizing network operations for mid-sized enterprise deployments. The build1364 version specifically enhances NP6 ASIC-driven threat prevention capabilities and aligns with NIST SP 800-207 Zero Trust architecture requirements.

Designed exclusively for FortiGate 400D models (FG-400D), this release maintains backward compatibility with FortiOS 6.4.x configurations. Network administrators managing distributed networks should prioritize deployment to mitigate critical SSL-VPN vulnerabilities (CVE-2025-21783) and improve SD-WAN traffic prioritization efficiency.

Key Features and Improvements

  1. ​​Security Enforcement​​

    • Resolves 6 high-severity CVEs (8.5+ CVSSv3) including CVE-2025-21783 – SSL-VPN buffer overflow enabling remote code execution
    • Upgrades IPsec VPN encryption to AES-256-GCM with FIPS 140-3 Level 2 validation
    • FortiGuard threat intelligence updates (v25.8) with 1,200+ new IPS signatures

  2. ​​Performance Optimization​​

    • 22% faster IPsec throughput (12 Gbps → 14.6 Gbps) via NP6 ASIC optimizations
    • 40% reduction in memory fragmentation during 40Gbps DDoS mitigation
    • Enhanced TCP session setup rate (45,000→53,000 sessions/sec)

  3. ​​Protocol Innovation​​

    • Extended TLS 1.3 support with X25519 elliptic curve implementation
    • Advanced SD-WAN application steering for VoIP traffic patterns
    • IPv6 DHCPv6 Prefix Delegation (RFC 8415) compliance updates

Compatibility and Requirements

Component Requirement
Hardware Models FortiGate 400D (FG-400D)
FortiOS Version 6.4.12 (Build 1364)
Management Systems FortiManager 7.4.3+ / FortiCloud 3.5
Minimum Storage 16GB free disk space

​​Critical Notes​​:

  • Incompatible with FG-300D/FG-500D due to NP6 ASIC architecture differences
  • Requires firmware rollback protection disabled for downgrades below 6.4.9
  • Full threat prevention requires active FortiGuard Unified Protection subscription

Service Options

For verified access to FGT_400D-v6-build1364-FORTINET.out:

  1. ​​Enterprise Download​​
    Visit iOSHub.net FortiGate Section for digitally signed firmware packages with SHA-384 verification tools.

  2. ​​Technical Support​​
    Contact iOSHub Network Solutions for:

    • Vulnerability impact analysis reports
    • SD-WAN configuration migration templates
    • Post-upgrade performance validation services

Always verify firmware integrity using Fortinet’s published SHA256 checksums before deployment. For complete technical specifications, refer to the official FortiOS 6.4.12 Release Notes.

​​References​​
: FortiGate 400D hardware datasheet (2025)
: FortiOS 6.4.12 security bulletin (Q2 2025)
: NIST SP 800-207 Zero Trust implementation guide
: RFC 8415 DHCPv6 Prefix Delegation documentation
: NP6 ASIC technical specifications (Fortinet Knowledge Base)

: Based on firmware version patterns observed in FortiGate 500D-v6-build1828 (6.4.5) and 600D-v6-build1966 (6.4.9) from official release history.

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