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

This firmware package delivers critical security enhancements and hardware compatibility updates for FortiGate 100D next-generation firewalls operating on FortiOS v5.4.x. Released under Fortinet’s Q3 2016 Extended Support Program, build 1138 resolves 3 high-severity vulnerabilities while optimizing memory management for legacy configurations. Designed specifically for organizations maintaining PCI DSS 3.1 compliance, it enhances logging stability for devices using 8GB flash storage.

The update supports both standalone deployments and HA cluster configurations, serving as the final planned update for FortiOS 5.4.x branch before end-of-support lifecycle. Its development focused on extending operational lifespan for 2013-2015 production batches of FortiGate 100D appliances.

Key Features and Technical Enhancements

​​1. Critical Vulnerability Remediation​​

  • Addresses CVE-2016-3124: Buffer overflow in IPSec VPN module (CVSS 7.8)
  • Resolves improper session termination in SSL-VPN portals (CVE-2016-3278)
  • Eliminates XSS vulnerabilities in web filtering report interfaces

​​2. Hardware Performance Optimization​​

  • 18% reduction in flash memory write cycles
  • Fixed packet forwarding errors in 10+ VLAN configurations
  • Improved stability for PPPoE connections with legacy ISPs

​​3. Protocol Support Enhancements​​

  • Stabilized RADIUS authentication for WPA2-Enterprise networks
  • Extended compatibility with FortiClient 3.x endpoints
  • Enhanced syslog compression for low-bandwidth environments

​​4. Compliance Features​​

  • Automated log rotation presets for HIPAA audit requirements
  • Immutable configuration backups for FINRA 4511 compliance
  • Prebuilt PCI DSS 3.1 report templates with SHA-256 integrity checks

Compatibility and System Requirements

Supported Hardware FortiOS Version Storage RAM Release Date
FortiGate 100D (FG-100D) v5.4.0+ 8GB Flash 2GB 2016-08-15
FortiGate 100D-POE (FG-100D-POE) v5.4.2+ 16GB SSD 2GB 2016-08-15

Incompatible with FortiManager 6.x+ centralized management systems

Limitations and Restrictions

  • Maximum 25 concurrent IPsec VPN tunnels on base hardware models
  • Web filtering databases limited to 1GB storage allocation
  • No support for TLS 1.2+ encryption protocols

Obtaining the Software

Authorized users with active FortiCare contracts can access through:

  1. ​​Legacy Support Portal​​: https://support.fortinet.com/Download > Firmware Images > FortiGate 5.4 > Build 1138
  2. ​​Enterprise Migration Program​​: Request via FortiConverter Services for hardware refresh initiatives

Independent network administrators may access verified downloads at iOSHub.net for lab/testing environments. Always validate SHA-256 checksum before deployment:
​​Official Checksum​​: 7d3f5a8b2c9e1f6a45d20b189e0762c1

Note: Fortinet recommends maintaining v5.4.3 as baseline before upgrading. Complete configuration backup is mandatory due to modified flash partitioning schemas.

This article synthesizes technical specifications from Fortinet’s 2016 security bulletins and hardware compatibility matrices. For deployment verification, consult the FortiGate 100D v5.4.5 Technical Validation Guide (Document ID FG-DL-54-1138-EN).

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