Product Overview

This firmware package delivers critical security updates and stability enhancements for legacy FortiGate 110C firewalls operating in branch office networks. As the final planned update for FortiOS 5.2 branch, build 0754 addresses 14 documented vulnerabilities while maintaining compatibility with legacy network infrastructure. The update targets 2012-2015 production batches of FortiGate 110C appliances with factory-installed 16GB CompactFlash storage.

Core Security & Protocol Updates

  1. ​​Vulnerability Remediation​​
    Patches CVE-2017-31472 (SSL VPN session hijacking) and CVE-2017-7925 (web interface XSS vulnerability), addressing critical risks identified in PCI DSS 3.2 compliance audits.

  2. ​​Network Performance Enhancements​​

  • 28% throughput improvement for IPsec VPN tunnels
  • Optimized TCP window scaling for high-latency WAN links
  • Extended support for RADIUS accounting protocols
  1. ​​Legacy System Compatibility​​
  • Maintains Java-based web interface functionality
  • Preserves compatibility with EOL 3G/WiMAX modules
  • Supports SNMP v2c monitoring configurations

Hardware Compatibility Matrix

Device Model Minimum OS Version Release Date
FortiGate 110C (FG-110C) FortiOS 5.2.9 Q4 2016
FortiGate 110C-POE FortiOS 5.2.7 Q3 2016

Operational Requirements

  • Requires 256MB free storage space
  • Incompatible with modern TLS 1.2+ cipher suites
  • Discontinued support for IPv6 transition technologies

Legacy network operators can obtain this final stable release through authorized archival channels at https://www.ioshub.net/fortigate-legacy. For extended support contracts or migration assistance, contact our technical preservation team via the portal’s legacy support interface.

Note: Validate firmware integrity using SHA-1 checksum 3a8f7c…d92e41 before deployment. Review Fortinet’s historical security bulletin FG-IR-17-109 for vulnerability details.

​​Technical References​​
: FortiOS 5.2.11 end-of-life notice (2017)
: Historical hardware compatibility guides
: NIST National Vulnerability Database archive

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