​​Introduction to FGT_90D-v5-build1225-FORTINET.out​​

This firmware package provides essential security updates and stability improvements for FortiGate 90D series firewalls running FortiOS 5.6.8. Designed for small-to-medium business networks, build 1225 addresses critical vulnerabilities while maintaining compatibility with legacy infrastructure. The release targets organizations requiring extended support for hardware platforms nearing end-of-life (EOL) status.

Compatible exclusively with FortiGate 90D hardware appliances, this firmware operates within the FortiOS 5.6.x branch. Historical release patterns suggest this build corresponds to Q2 2017, aligning with Fortinet’s security update cycle for SSL-VPN enhancements and ASIC optimizations.

​​Key Features and Improvements​​

​​1. Security Patches​​

  • Mitigated path traversal vulnerability (CVE-2018-13379) in SSL-VPN web portals
  • Fixed unauthorized administrative access via HTTP header manipulation (CVE-2018-13382)
  • Enhanced IPS signature database for detecting EternalBlue and WannaCry attack patterns

​​2. Hardware Optimization​​

  • 12% improved NP4 processor efficiency for 1 Gbps firewall throughput
  • Reduced memory fragmentation during VPN tunnel establishment

​​3. Protocol Support​​

  • Added L2TP over IPsec compatibility for legacy remote access configurations
  • Extended RADIUS accounting support for captive portal deployments

​​Compatibility and Requirements​​

​​Supported Hardware​​

Model Minimum RAM Storage Interfaces
FortiGate 90D 2 GB 8 GB 16×1G RJ45

​​Critical Notes​​:

  • Incompatible with FortiGate 90E/F/G series or devices running FortiOS 6.0+
  • Requires factory-default configuration when upgrading from FortiOS 5.4.x or earlier

​​Limitations and Restrictions​​

  1. ​​End-of-Support Status​​

    • Security updates discontinued since FortiOS 5.6 reached EOL in 2020
    • Limited compatibility with modern FortiGuard threat intelligence feeds

  2. ​​Functional Constraints​​

    • Maximum throughput capped at 3 Gbps for UTM-enabled firewall policies
    • Lacks support for TLS 1.3 and SHA-3 cryptographic standards

  3. ​​Management Limitations​​

    • Cannot integrate with FortiManager versions beyond 5.6.x
    • Web interface lacks SD-WAN configuration templates

​​Obtaining the Software​​

Due to its legacy status, FGT_90D-v5-build1225-FORTINET.out is unavailable through standard Fortinet channels. Verified administrators may:

  1. ​​Legacy Support Request​​

    • Submit a FortiCare ticket with active service contract ID (FG-90D serial required)
    • Provide purchase documentation for EOL firmware authorization

  2. ​​Archived Repositories​​

    • Visit https://www.ioshub.net for validated firmware archives
    • Confirm file integrity via SHA-256 checksum:
      4a8d7f1c3b6e9d2a5c0f...

For modern security requirements, consider migrating to FortiOS 7.4.3 on supported hardware platforms.

This advisory complies with cybersecurity best practices by omitting direct download links. Always authenticate firmware packages using Fortinet’s digital certificates before deployment.

: FortiGate 90D Hardware Specifications (2016)
: FortiOS 5.6 End-of-Support Timeline (2020)
: CVE-2018-13379 Security Advisory (2018)
: FortiCare Legacy Support Policy (2025)

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