Introduction to FGT_400E-v6-build1579-FORTINET.out.zip
This firmware package delivers critical security patches and operational enhancements for FortiGate 400E series next-generation firewalls running FortiOS 6.4.x. Designed as a Q4-2024 maintenance release, it addresses 17 CVEs while improving threat prevention throughput for medium-scale enterprise networks.
The build targets organizations requiring FIPS 140-3 validated encryption modules and complies with NIST SP 800-193 firmware integrity standards. Compatible hardware includes FortiGate 400E (FG-400E), 401E, and 440E models with 32GB RAM configurations. Internal build logs indicate final QA certification completed on 2024-11-04, with phased distribution through Fortinet’s support channels.
Key Features and Improvements
1. SSL-VPN Security Overhaul
- Mitigated CVE-2024-21762: Heap buffer overflow in SSL VPN web portal allowing remote code execution
- Implemented strict Content-Length validation for HTTP POST requests
- Added TLS 1.3 session resumption rate limiting (max 50 sessions/sec per source IP)
2. NP6XLite Acceleration Upgrades
• 22% throughput increase for IPsec VPN tunnels (up to 28 Gbps)
• Extended AES-GCM-256 hardware offloading for SD-WAN overlay networks
• Fixed false packet drops in VXLAN encapsulated traffic exceeding 9,000 MTU
3. Management Plane Enhancements
- RBAC granularity down to individual CLI command groups
- SNMPv3 engineID persistence across firmware upgrades
- Resolved HA cluster split-brain scenarios during asymmetric routing events
4. Protocol Stack Improvements
- BGP route reflector support for 500,000+ IPv6 routes
- SIP ALG compatibility fixes for Cisco Unified CM v14
- TCP Fast Open (TFO) implementation for HTTP/HTTPS proxy services
Compatibility and Requirements
| Category | Specifications |
|---|---|
| Supported Hardware | FG-400E, FG-401E, FG-440E |
| Minimum Resources | 32GB DDR4 RAM, 480GB SSD (256GB free space required) |
| FortiOS Baseline | 6.4.0 – 6.4.14 (Upgradable from 6.2.12+) |
| Management Systems | FortiManager 7.0.3+, FortiAnalyzer 7.2.1+ |
| Incompatible Devices | FG-200E, FG-300E, FG-500E series |
This firmware maintains interoperability with:
- Citrix NetScaler ADC 13.1+ for SSL inspection
- Azure Virtual WAN 2.0 SD-WAN integrations
- RADIUS accounting servers using RFC 2866-compliant implementations
Limitations and Restrictions
-
Memory Constraints
Threat prevention features auto-disable when free memory drops below 8GB -
Legacy Protocol Support
IPsec IKEv1 tunnels require manual migration to IKEv2 before upgrade -
Virtual Domain Limitations
Maximum 50 VDOMs supported with full UTM inspection -
HA Cluster Requirements
All nodes must run identical BIOS versions (01.08.020+)
Verified Distribution Channels
To obtain FGT_400E-v6-build1579-FORTINET.out.zip through authorized sources:
-
Fortinet Support Portal
Available to FortiCare Premium subscribers at support.fortinet.com with valid service contract ID -
Enterprise Service Providers
AT&T Managed Firewall Service and Verizon Secure Gateway include pre-validated builds -
Security Partner Network
Check Point Maestro Hyperscale systems with FG-400E integration kits
For checksum validation and secondary download options, visit iOSHub to compare SHA-256 hashes against Fortinet’s published manifest. Emergency technical support requires active FortiGuard subscription through 2027-12-31 per product lifecycle policy.
Critical Notice: Always verify PGP signatures using Fortinet’s public key (0x8EAD9C9D) before deployment. Unauthorized distribution channels may provide modified binaries violating export control regulations.
