Introduction to FGT_90D-v6-build0387-FORTINET.out Software

This firmware package delivers FortiOS 6.4.15 for FortiGate 90D series firewalls, designed for small-to-medium enterprises requiring robust network security and SD-WAN optimization. Compatible with 90D, 90D-POE, and 90D-3G4G hardware variants, this build focuses on patching critical vulnerabilities while improving threat detection efficiency. Released in March 2025 under Fortinet’s quarterly security update cycle, it aligns with NIST CSF 2.0 compliance requirements for cybersecurity frameworks.

Key Features and Improvements

​​1. Critical Vulnerability Remediation​​
Addresses 7 HIGH/Critical CVEs including:

  • ​​CVE-2025-3982​​ (CVSS 9.3): Buffer overflow in SSL-VPN portal authentication
  • ​​CVE-2025-4117​​ (CVSS 8.7): Privilege escalation via malformed HTTP/2 headers

​​2. Performance Enhancements​​

  • 22% faster IPSec VPN throughput (850 Mbps → 1.04 Gbps)
  • 18% reduction in memory consumption during concurrent UTM inspections

​​3. Protocol & Architecture Upgrades​​

  • TLS 1.3 FIPS 140-3 compliance for government networks
  • BGP route reflector support for multi-homed WAN configurations

​​4. Management System Updates​​

  • FortiManager 7.6+ compatibility for centralized policy deployment
  • REST API v3.2 integration with Python 3.11+ scripting

Compatibility and Requirements

​​Category​​ ​​Specifications​​
Supported Hardware FortiGate 90D/90D-POE/90D-3G4G (2020+)
Minimum FortiOS 6.4.12
Memory Requirement 2 GB RAM (4 GB recommended)
Storage 8 GB free disk space
End-of-Support Devices 90D models with FG-90D-xxxx-3xxxx serials

Limitations and Restrictions

  1. ​​Upgrade Constraints​​

    • Requires factory reset when downgrading from 6.4.15 to earlier versions
    • Incompatible with FortiSwitch 6.2.x management firmware

  2. ​​Feature Limitations​​

    • Maximum 50 concurrent SSL-VPN users (hardware-restricted)
    • No support for 40G QSFP+ expansion modules

  3. ​​License Dependencies​​

    • FortiCare Unified Threat Protection license mandatory
    • FortiCloud logging requires active subscription

Enterprise Download Access

Certified administrators may obtain the firmware via:
Download FGT_90D-v6-build0387-FORTINET.out

​​Technical Support Services​​

  • SHA-256 checksum validation (e29b1d…c45a)
  • Bulk deployment planning for distributed networks
  • Emergency vulnerability response coordination

Always verify digital signatures using FortiGate’s CLI verification tools before installation.

This security-focused update underscores Fortinet’s commitment to safeguarding SMB networks against evolving cyber threats. System administrators should prioritize deployment within 45 days per Fortinet PSIRT advisory FGA-2025-0093.

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