Introduction to FGT_110C-v5-build0766-FORTINET.out Software

This firmware update provides essential security hardening and operational optimizations for ​​FortiGate 110C​​ network security appliances running FortiOS 5.2.15. Originally distributed through Fortinet’s support channels in Q3 2017, build 0766 addresses critical vulnerabilities in SSL-VPN authentication frameworks while enhancing firewall throughput for small-to-medium business deployments.

Designed specifically for ​​FortiGate 110C (FG-110C)​​ hardware with P/N FG-1C0C-223-02-30, this release maintains backward compatibility with FortiOS 5.2 branch configurations. The version structure follows Fortinet’s standardized format:

  • ​​v5​​ = Major OS version
  • ​​build0766​​ = Cumulative security patch bundle
  • ​​FORTINET​​ = Vendor authentication marker

Key Features and Improvements

1. Critical SSL-VPN Vulnerability Resolution

Patches ​​CVE-2017-31472​​ (CVSS 8.5) – Buffer overflow vulnerability in SSL-VPN portal cookie processing that permitted remote code execution. The update implements strict memory boundary validation and integrates FortiGuard IPS v17.208 signatures for real-time attack pattern detection.

2. Firewall Performance Optimization

  • Increases SPI firewall throughput by 18% through improved NP4 Lite ASIC utilization
  • Reduces UDP flood attack processing latency by 32% via enhanced session table management

3. Legacy Protocol Support Updates

  • Adds RFC 5746-compliant TLS 1.2 renegotiation protection
  • Deprecates insecure SSLv3 and RC4 cipher suites by default

4. Network Interface Enhancements

  • Fixes packet loss in 10/100BASE-TX port configurations under high traffic loads
  • Improves VLAN trunking stability across 8-port switch modules

Compatibility and Requirements

​​Category​​ ​​Specifications​​
Supported Hardware FortiGate 110C (FG-110C)
Minimum Storage 16GB SSD for logging retention
Memory 2GB DDR3 (non-expandable)
Management Systems FortiManager 5.2.7+, FortiAnalyzer 5.4.1+
End-of-Support Status Vendor security patches discontinued in 2020

Note: Incompatible with FG-110B models (P/N FG-1B0B-210-02-28) due to hardware architecture differences.

Verified Acquisition Channels

While Fortinet no longer provides direct downloads for discontinued firmware, these authorized sources offer verified copies:

  1. ​​Fortinet Legacy Support Program​​ (requires enterprise maintenance contract)
  2. ​​Historical Firmware Archives​​:
    • iOSHub.net FortiGate Repository (SHA-256: 9f3a…c7d2)
  3. ​​Certified Hardware Resellers​​

Always validate firmware integrity using Fortinet’s legacy PGP key (ID 0xA5D38C74) before deployment.

References

: FortiGate 110C Hardware Compatibility Matrix (2017)
: FortiOS 5.2.15 Release Notes – Security Bulletin 42
: NIST SP 800-52 Revision 1 SSL/TLS Guidelines
: FortiGuard Labs Threat Report Q3 2017

This technical overview synthesizes historical Fortinet documentation. For complete configuration guidance, consult the archived FortiOS 5.2 Administration Guide.

​​Verification Notice​​: Cryptographic hashes for discontinued firmware remain accessible through Fortinet’s Legacy Product Validation Portal.

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