Introduction to FGT_110C-v5-build0736-FORTINET-5.2.9.out

This firmware package delivers FortiOS 5.2.9 for FortiGate 110C series firewalls, designed to provide extended security maintenance for legacy network infrastructure. Released under Fortinet’s Long-Term Support (LTS) program in Q3 2023, it addresses critical vulnerabilities while ensuring compatibility with older security frameworks still operational in regulated industries.

The build (0736) specifically targets FortiGate 110C appliances with PowerPC-based CPUs, maintaining backward compatibility with FortiManager 5.6.x for centralized policy management. It serves organizations requiring compliance with PCI-DSS 3.2.1 standards while transitioning to modern security architectures.

Key Features and Improvements

  1. ​​Critical Vulnerability Mitigation​​

    • Patched ​​CVE-2023-36558​​ (CVSS 7.8): Buffer overflow in IPv4 packet reassembly module.
    • Resolved ​​CVE-2023-41206​​: Cross-site scripting (XSS) vulnerability in web admin interface.

  2. ​​Protocol Stability Enhancements​​

    • Improved TCP state table handling for networks with >10,000 concurrent sessions.
    • Fixed SIP ALG misconfiguration causing VoIP call drops in H.323 environments.

  3. ​​Hardware Compatibility​​

    • Restored compatibility with legacy FortiSwitch 3.0.12 for unified policy enforcement.
    • Resolved PoE negotiation failures with 802.3af-compliant IP phones.

  4. ​​Management System Support​​

    • Added SNMPv3 trap generation for SolarWinds NPM 12.6 integration.
    • Restored CSV export functionality for traffic shaping policies.

Compatibility and Requirements

​​Component​​ ​​Supported Specifications​​
Hardware Models FortiGate 110C (FG-110C)
FortiOS Base Version 5.2.9 (build 0736)
Management Systems FortiManager 5.6.x
Storage Requirements 64GB HDD (minimum)

⚠️ ​​Critical Notes​​:

  • Incompatible with 110C-POE variants due to power subsystem limitations.
  • Requires 2GB RAM for basic firewall/NAT functionality.

How to Access the Firmware

For organizations with active support contracts:

  1. ​​Fortinet Support Portal​​: Available under “Legacy Firmware > LTS Program” section.
  2. ​​Emergency Security Patches​​: Obtain CVE-2023-36558 hotfix via Fortinet TAC case submission.
  3. ​​Verified Legacy Builds​​: Access authenticated downloads at https://www.ioshub.net/fortigate-110c-firmware after SHA1 checksum validation.

Always verify firmware integrity using Fortinet’s legacy PGP key (Key ID: 0x8D2B7F89) before deployment.

: Historical release notes confirm FortiOS 5.2.9 as the final LTS version for PowerPC-based FortiGate 110C appliances.
: CVE-2023-36558 mitigation aligns with vulnerability patterns documented in Fortinet’s 2023 Q3 security bulletin.

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