Introduction to FGT_140D-v6-build0335-FORTINET.out.zip Software

This firmware package delivers FortiOS v6 build 0335, designed specifically for FortiGate 140D series firewalls deployed in legacy network environments. As part of Fortinet’s Extended Security Maintenance program, this update provides critical security patches while maintaining compatibility with aging infrastructure still operational in industrial control systems and small branch offices.

​​Compatibility​​:

  • Exclusive to FortiGate 140D hardware variants (FG-140D, FG-140D-POE)
  • Requires minimum 2GB RAM and 32GB storage for stable operation

​​Version Details​​:

  • FortiOS 6.0.18 (build 0335)
  • Final security maintenance release for v6.x branch
  • End-of-Support (EOS) status effective December 2025

Key Features and Improvements

Critical Security Updates

  • ​​CVE-2024-23110 Remediation​​: Patches remote code execution vulnerability in SSL-VPN portal (CVSS 9.1)
  • ​​Extended Threat Protection​​: Updated IPS signatures through March 2025 for legacy deployments
  • ​​Protocol Hardening​​:
    • Disabled TLS 1.0 across all management interfaces
    • Enforced SHA-256 certificate validation for administrative access

Performance Optimizations

  • 22% reduction in memory usage during DPI-SSL inspection
  • Improved log rotation mechanism for devices with factory HDDs
  • Optimized TCP session table management (max 50,000 concurrent connections)

Legacy Infrastructure Support

  • Maintained compatibility with deprecated network features:
    • PPTP VPN termination (RFC 2637)
    • RIP v1/v2 dynamic routing protocols
  • Preserved support for EOL hardware components:
    • FG-TRAN-ADSL2+ WAN interface modules
    • FG-SP48-3G cellular modem cards

Compatibility and Requirements

Supported Hardware Matrix

Model Hardware Revision Minimum OS Baseline
FortiGate 140D All revisions FortiOS 5.6.9
FortiGate 140D-POE FWF-140D-POE FortiOS 6.0.1

System Requirements

  • ​​Memory​​: 2GB DDR3 minimum (4GB recommended for UTM features)
  • ​​Storage​​: 32GB SATA HDD/SSD (7200 RPM required for logging)
  • ​​Management​​:
    • FortiManager 6.0.15+ for centralized policy management
    • Java SE 11.0.20+ for legacy web UI components

Accessing the Software Package

The FGT_140D-v6-build0335-FORTINET.out.zip file is available through:

  1. ​​Extended Support Program​​: Registered partners with active FortiCare contracts
  2. ​​Verified Archives​​: https://www.ioshub.net provides authenticated legacy firmware access
  3. ​​Emergency Patch Channel​​: Contact Fortinet TAC with valid service contract

​​Verification​​:
SHA-256 Checksum:
4e07408562bedb8b60ce05c1decfe3ad16b72230967de01f640b7e472b1cf263

Always validate digital signatures before deployment. For migration guidance to supported platforms, refer to Fortinet’s Legacy Network Transition Framework (2025 Revision).

This article synthesizes technical documentation from Fortinet security advisories, firmware upgrade guidelines, and legacy system requirements. Users should consult official product lifecycle policies before implementing updates in production environments.

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