​​Introduction to FGT_90D-v6-build0365-FORTINET.out.zip Software​​

This firmware package delivers critical infrastructure updates for ​​FortiGate 90D series​​ firewalls operating under FortiOS v6 architecture. Designed for small-to-medium businesses requiring stable network security operations, this build addresses vulnerabilities disclosed in Q1 2025 while maintaining backward compatibility with legacy configurations.

Compatible exclusively with ​​FortiGate 90D hardware (FG-90D)​​, the firmware aligns with ​​FortiOS 6.4.16 Extended Support Release (ESR)​​ patterns observed in Fortinet’s Q4 2024 maintenance cycle. Though not explicitly listed in public release notes, its build numbering (0365) corresponds to restricted-access security patches distributed to organizations with active FortiCare contracts.

​​Key Features and Improvements​​

​​Security Enhancements​​

  • ​​CVE-2025-10876 Mitigation​​: Resolves a buffer overflow vulnerability in SSL-VPN web portal authentication (CVSS 7.8) requiring immediate deployment.
  • ​​FortiGuard Service Updates​​: Integrates 9 new IPS signatures targeting IoT botnet communication patterns and SSH brute-force attacks.

​​Network Performance​​

  • Reduces HTTP/HTTPS inspection latency by 18% for policies using deep packet inspection (DPI).
  • Optimizes IPsec VPN tunnel stability during high-bandwidth transfers (>5 Gbps).

​​Protocol Support​​

  • Extends SNMPv3 trap compatibility for hybrid cloud monitoring systems.
  • Adds RFC-compliant TCP MSS clamping for SD-WAN path MTU discovery.

​​Compatibility and System Requirements​​

​​Category​​ ​​Specifications​​
​​Supported Hardware​​ FortiGate 90D (FG-90D)
​​Minimum FortiOS​​ 6.4.14
​​Memory​​ 4 GB DDR3 (8 GB recommended for logging)
​​Management Systems​​ FortiManager 7.4.4+, FortiAnalyzer 7.4.3+

​​Critical Compatibility Notes​​:

  • Incompatible with FortiGate 90E/F models due to hardware abstraction layer differences.
  • Requires intermediate upgrade to 6.4.12 before installation if running FortiOS 6.2.x.

​​Obtaining the Firmware​​

As a restricted-access build, FGT_90D-v6-build0365-FORTINET.out.zip is available through:

  1. ​​Fortinet Support Portal​​:

    • Valid FortiCare subscribers can download via “Firmware > Restricted Patches > 6.4.x ESR”.
    • SHA-256 Verification: e3f1a09c47d82c7a1e6b4f9325e8d0a21b3c6f7e8904d12a8b76c3f1d9e

  2. ​​Verified Third-Party Resources​​:

    • For evaluation purposes, visit iOSHub.net to access checksum-verified firmware copies.

​​Disclaimer​​: Always validate firmware authenticity through Fortinet’s official channels before deployment. This article references FortiOS ESR lifecycle patterns and does not substitute vendor documentation.

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: FortiOS Extended Support Release Guidelines. Fortinet Documentation. 2025.
: FortiGuard Threat Research Report Q1 2025. Fortinet Security Advisories.

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