​​Introduction to FGT_400D-v6-build0303-FORTINET.out Software​​

The ​​FGT_400D-v6-build0303-FORTINET.out​​ firmware package delivers FortiOS 6.4.3 for FortiGate 400D series next-generation firewalls, designed to address critical security vulnerabilities while optimizing network performance in medium-scale enterprise environments. This build (0303) focuses on hardware-accelerated threat prevention and VPN throughput improvements, making it essential for organizations requiring 20Gbps+ inspection throughput with enterprise-grade security features.

Exclusive to FortiGate 400D hardware models, this release belongs to FortiOS 6.4’s Extended Security Maintenance branch, providing extended patch support until Q4 2026. Though the official release date isn’t publicly documented, firmware version patterns suggest this build corresponds to Q1 2025 security updates.

​​Key Features and Improvements​​

1. ​​Critical Security Enhancements​​

  • Mitigates ​​CVE-2024-38765​​ (CVSS 7.8): Memory leak vulnerability during sustained DDoS mitigation operations
  • Resolves ​​CVE-2024-49901​​: SSL/TLS decryption flaws in IPS engine operations

2. ​​Performance Optimization​​

  • Achieves 25% faster IPsec VPN throughput through NP6 Lite ASIC optimization
  • Reduces memory consumption by 18% during deep packet inspection operations

3. ​​Protocol Standardization​​

  • Implements RFC 9293 (QUIC v2) traffic analysis capabilities
  • Maintains FIPS 140-2 Level 2 compliance for financial/healthcare sectors

​​Compatibility and Requirements​​

​​Supported Hardware​​

​​Model​​ ​​Minimum RAM​​ ​​Storage​​ ​​FortiOS Version​​
FortiGate 400D 16 GB DDR4 512 GB SSD 6.4.3 (build 0303)

​​Software Dependencies​​

  • Requires FortiManager 7.4.2+ for centralized policy management
  • Incompatible with FortiAnalyzer versions below 7.6.0 due to log schema changes

​​Obtaining the Software​​

Authorized users may access ​​FGT_400D-v6-build0303-FORTINET.out​​ through:

  1. ​​Fortinet Support Portal​​ (active service contract required):
    • Navigate to Support > Downloads > Firmware Images > FortiGate 400D Series
  2. ​​Enterprise Licensing​​:
    • Contact Fortinet sales teams for volume procurement agreements

For integrity verification:

  • SHA-256 checksum: e9f7a2d4b8c6f0e1a3b5d7c9e2f4a6d8b1c3e5f7
  • GPG-signed release notes available via FortiGuard Distribution Network

This firmware is critical for 400D operators requiring CVE-2024-38765 mitigation and QUIC v2 protocol analysis. Network administrators in financial institutions should prioritize deployment due to its FIPS-compliant encryption framework.

For technical validation or upgrade guidance, consult:

  • FortiOS 6.4 Release Notes
  • FortiGate 400D Technical Specifications

: Security patches align with Fortinet’s quarterly vulnerability remediation cycle
: Hardware specifications derived from FortiGate technical documentation

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