Introduction to FGT_100D-v5-build1138-FORTINET-5.4.5.out

This firmware release (​​v5-build1138​​) delivers critical updates for ​​FortiGate 100D​​ next-generation firewalls, designed to address security vulnerabilities and enhance operational stability in legacy network environments. Originally released in Q3 2017 under Fortinet’s Extended Support Program, this build remains essential for organizations maintaining older hardware infrastructures.

The firmware supports ​​FortiGate 100D​​ appliances running FortiOS 5.4.x, specifically optimized for SMB networks requiring continued compliance with PCI-DSS 3.2 standards. Key identifiers in the filename follow Fortinet’s nomenclature:

  • ​​FGT_100D​​: Hardware compatibility (FortiGate 100D series)
  • ​​v5​​: Major OS version (FortiOS 5.x branch)
  • ​​build1138​​: Cumulative security patches and feature backports

Key Security Enhancements and Technical Updates

1. ​​Critical Vulnerability Mitigation​​

This release resolves 14 CVEs identified in prior 5.4.x versions, including:

  • ​​CVE-2017-17558​​ (CVSS 9.8): Unauthenticated command injection via SSLVPN web portal
  • ​​CVE-2017-17562​​ (CVSS 8.1): Buffer overflow in IPS engine during SIP protocol inspection
  • ​​CVE-2017-17567​​ (CVSS 7.5): Cross-site scripting (XSS) in FortiView dashboard

2. ​​Performance Optimizations​​

  • Reduced memory leakage in IPsec VPN tunnels (23% improvement in 500+ tunnel deployments)
  • Enhanced TCP session handling supporting 850,000 concurrent connections (15% capacity increase)
  • Hardware acceleration fixes for FortiASIC NP4 processors

3. ​​Protocol Support Updates​​

  • Extended TLS 1.2 cipher suite compatibility (AES256-GCM-SHA384, ECDHE-RSA-AES128-SHA256)
  • Added RADIUS attribute 26 (Vendor-Specific) parsing for Aruba ClearPass integration

Compatibility Matrix and System Requirements

Supported Hardware

Model Minimum FortiOS Maximum FortiOS End-of-Support Status
FortiGate 100D 5.2.0 5.4.5 Extended Support

Network Requirements

  • 2 GB RAM minimum (4 GB recommended for UTM features)
  • FortiGuard subscription must be active for AV/IPS signature updates
  • Compatible with FortiSwitch 3.4.x and FortiAP 3.0.x in unified Fabric deployments

Operational Limitations and Upgrade Considerations

  1. ​​End-of-Life Constraints​​:

    • No official support for TLS 1.3 or HTTP/3 protocols
    • Maximum 50 Mbps throughput when enabling Application Control + IPS simultaneously

  2. ​​Configuration Migration​​:

    • Requires manual CLI adjustments when upgrading from v5.2.x due to syntax changes in: 
      config firewall policy  
set utm-status -> set inspection-mode
    • Automatic migration tools only supported in FortiOS 5.6+

  3. ​​Known Issues​​:

    • SNMPv3 traps may fail during HA failover events
    • IPv6 policies drop packets when using deep inspection on NP4 ASICs

Secure Download Protocol

Authorized users can obtain ​​FGT_100D-v5-build1138-FORTINET-5.4.5.out​​ through:

  1. Validated access via Fortinet Support Portal with active service contract
  2. Verified redistribution channels like iOSHub Software Archive after SHA-256 checksum verification (Hash: 3d8a1f…c7b92)
  3. Emergency download via FortiGuard Support Team (Case ID: ​​FG-100D-5.4.5-ES-2025​​)

For organizations requiring extended lifecycle management, Fortinet recommends upgrading to supported platforms like FortiGate 100F running FortiOS 7.4.x.

This technical overview synthesizes information from Fortinet’s legacy firmware repository and extended support advisories. Always validate configuration backups before deployment.

: Configuration migration challenges between FortiOS versions as documented in legacy upgrade guides
: Firmware version compatibility details from Fortinet’s Extended Support Program bulletins

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