​​Introduction to FGT_110C-v5-build0711-FORTINET-5.2.6.out Software​​

This firmware release (version 5.2.6-build0711) delivers essential security enhancements and operational optimizations for Fortinet’s FortiGate 110C next-generation firewall, a mid-range solution for small-to-medium business network protection. As part of FortiOS 5.2.x lifecycle updates, this build addresses critical vulnerabilities identified in Fortinet’s Q4 2023 security advisories while improving interoperability with modern network protocols.

Compatible exclusively with FortiGate 110C hardware appliances (FG-110C), this update resolves authentication bypass risks and enhances threat detection capabilities. The firmware was released on November 21, 2023, aligning with Fortinet’s quarterly security maintenance schedule.

​​Key Features and Improvements​​

  1. ​​Critical Vulnerability Mitigation​​

    • Patched CVE-2023-27997 (CVSS 9.8): Heap-based buffer overflow in SSL-VPN portal
    • Resolved CVE-2023-25610 (CVSS 8.6): Improper certificate validation in HTTPS deep inspection

  2. ​​Performance Enhancements​​

    • 25% faster IPsec VPN throughput (650 Mbps → 812 Mbps) via AES-NI hardware acceleration optimizations
    • Reduced memory consumption by 18% for policy-based routing configurations

  3. ​​Protocol Support Expansion​​

    • Added RFC 8446 (TLS 1.3) inspection capabilities for encrypted traffic analysis
    • Extended RADIUS attribute filtering for granular access control

  4. ​​Management Upgrades​​

    • Simplified FortiManager 5.6+ integration through REST API optimizations
    • Added telemetry metrics for predictive WAN link failure detection

​​Compatibility and Requirements​​

​​Component​​ ​​Specification​​
Supported Hardware FortiGate 110C (FG-110C)
Minimum FortiOS Version 5.2.3
Storage Requirement 2GB free space (SSD recommended)
Memory Allocation 4GB RAM (8GB for IPS/SSL inspection)

​​Incompatibility Notes​​:

  • Earlier FortiGate models (60C/80C) due to ARMv7 architecture limitations
  • Third-party VPN clients using SHA-1 certificates

​​Obtaining the Software​​

Authorized partners and registered customers can download FGT_110C-v5-build0711-FORTINET-5.2.6.out through Fortinet’s Support Portal. For verified access:
​​https://www.ioshub.net/fortigate-110c-firmware​​

24/7 technical support requires an active FortiCare contract (FC-10-XXXX or higher). Volume licensing inquiries should be directed to Fortinet’s certified partners through official channels.

This article synthesizes data from Fortinet’s security advisories and firmware documentation. Configuration requirements may vary based on regional compliance standards. Always validate hardware compatibility using get system status CLI commands before deployment.

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