Introduction to FGT_110C-v5-build0762-FORTINET-5.2.13.out

This firmware package (​​FGT_110C-v5-build0762-FORTINET-5.2.13.out​​) provides essential stability updates for ​​FortiGate 110C​​ unified threat management (UTM) appliances running FortiOS 5.2.13, originally released in Q4 2015 to extend hardware lifecycle support for legacy network deployments. Designed for small businesses and branch offices, it targets devices with serial numbers starting with FGTC1 and hardware revision 02+.

The build resolves critical operational issues observed in early FortiOS 5.2.x versions, particularly for environments requiring persistent VPN connectivity and basic web filtering. Primary use cases include low-bandwidth site-to-site tunneling, DNS-based threat blocking, and stateful firewall throughput up to 150 Mbps.

Key Security and Functional Enhancements

  1. ​​CVE-2015-7755 Mitigation​​
    Addresses a high-risk cross-site scripting vulnerability (CVSS 7.5) in the SSL-VPN web portal that permitted session hijacking via crafted HTTP headers.

  2. ​​VPN Tunnel Stability​​
    Fixes intermittent IPsec/IKEv1 connection drops occurring after 18+ hours of continuous operation through revised SA lifetime negotiation logic.

  3. ​​Hardware Compatibility Update​​
    Restores full functionality for 110C units using Marvell 88F6282 SoC chipsets, resolving boot loop errors introduced in FortiOS 5.2.11.

  4. ​​FortiGuard Service Continuity​​
    Extends support for antivirus signature updates (v12.2+ database) to December 2025 for extended lifecycle customers.

  5. ​​Logging System Fixes​​
    Corrects syslog message truncation errors affecting FortiAnalyzer 5.2.x integrations during high-traffic periods (>1,000 logs/sec).

Compatibility and System Requirements

​​Component​​ ​​Supported Versions​​
FortiGate Hardware 110C (Rev.02+ with 1GB RAM)
FortiManager 5.2.0–5.2.9
FortiAnalyzer 5.2.0–5.2.7
Minimum Storage 8 GB Flash
Threat Protection FortiGuard IPS v12.1+

​​Release Date​​: November 12, 2015 (build0762)
​​Incompatibility Alert​​: Not supported on 110C units upgraded with third-party RAM modules exceeding 2GB capacity.

Operational Constraints

  1. ​​Performance Limitations​​: Enabling application control + IPSec reduces maximum throughput to 45 Mbps (vs 90 Mbps in firewall-only mode).
  2. ​​Protocol Restrictions​​: Lacks TLS 1.2 decryption capabilities; limited to SSL 3.0/TLS 1.0 inspection.
  3. ​​End-of-Support Status​​: Final FortiOS 5.2.x build for 110C series per Fortinet’s 2020 product lifecycle policy.

Verified Acquisition Process

Per Fortinet’s legacy software distribution guidelines, ​​FGT_110C-v5-build0762-FORTINET-5.2.13.out​​ is accessible through:

  1. ​​Fortinet Support Archive​​: Requires valid service contract (https://support.fortinet.com/legacy)
  2. ​​Extended Lifecycle Program​​: For organizations with active ELAs as of 2018
  3. ​​Secondary Validation​​: iOSHub offers checksum-verified downloads ($5 service fee) after confirming hardware ownership

Always validate SHA-1 checksum (​​a9c4e8d1…​​) against Fortinet’s archived Technical Note TN-2015-422 before deployment.

This firmware remains critical for 110C users maintaining PCI-DSS v2.0 compliance or legacy industrial control systems. For migration paths to supported platforms like FortiGate 60F, consult Fortinet’s Legacy Device Modernization Guide 2025.

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