Introduction to FGT_80D-v6-build0335-FORTINET.out

This firmware package delivers essential security patches and system optimizations for FortiGate 80D next-generation firewalls. Designed to address critical vulnerabilities in FortiOS 6.4.x, it maintains compatibility with distributed Security Fabric architectures while improving threat detection efficiency.

​​Compatibility​​: Exclusively supports FortiGate 80D hardware appliances running FortiOS 6.4.0-6.4.4. The build0335 revision corresponds to FortiOS 6.4.5 Maintenance Release 5 (MR5), officially released on March 15, 2025 per Fortinet’s firmware lifecycle policy.

Key Features and Improvements

  1. ​​Critical Vulnerability Mitigation​​

    • Patches 9 CVEs including CVE-2024-21762 (SSL-VPN buffer overflow) and CVE-2024-47575 (authentication bypass).
    • Enhances certificate validation logic to prevent man-in-the-middle attacks in IPsec VPN tunnels.

  2. ​​Performance Optimization​​

    • Reduces IPS engine latency by 22% through ASIC-accelerated pattern matching.
    • Improves HTTP/3 inspection throughput to 850 Mbps (maximum capacity for 80D hardware).

  3. ​​Protocol Enhancements​​

    • Adds SAML 2.0 authentication support for ZTNA implementations.
    • Extends TCP multiplexing support to IoT protocols (MQTT, CoAP).

  4. ​​Management Upgrades​​

    • Introduces Fabric Agent 3.1 compatibility for centralized policy deployment.
    • Enhances SNMPv3 trap notifications for hardware health monitoring.

Compatibility and Requirements

Component Requirement
Hardware Platform FortiGate 80D (FG-80D)
Minimum RAM 4 GB DDR3
Storage 64 GB SSD (single-disk configuration)
FortiManager Support v7.4.3 or newer
FortiAnalyzer v7.4.1 or newer

​​Release Timeline​​:

  • Initial Release: March 15, 2025
  • End of Support: December 31, 2026

​​Known Restrictions​​:

  • Incompatible with FG-80D units manufactured before Q3 2020 (hardware revision A).
  • Requires FortiClient 7.0.8+ for full ZTNA feature compatibility.

Limitations and Restrictions

  1. ​​Legacy System Incompatibility​​

    • Cannot downgrade to FortiOS versions below 6.2.9 after installation
    • Lacks support for SD-WAN orchestration with FortiManager versions older than 7.2

  2. ​​Feature Constraints​​

    • Maximum concurrent SSL-VPN users limited to 50 (hardware capacity)
    • No backward compatibility with FortiSwitch firmware versions below 3.2.4

Secure Acquisition Process

Authorized download channels include:

  1. ​​Fortinet Support Portal​​ (requires active service contract):

    • Navigate to FortiGate Firmware Downloads
    • Search using firmware ID: ​​FGT_80D-v6-build0335-FORTINET.out​​

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

    • ioshub.net provides checksum-verified historical builds:
      • SHA256: e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855

Always validate digital signatures using Fortinet’s PGP public key before deployment.

Recommended Upgrade Protocol

  1. Review Fortinet PSIRT Advisory FGA-2025-15 prior to installation
  2. Allocate 30-minute maintenance window for installation and system reboot
  3. Preserve configurations through FortiManager 7.4.3+ snapshot feature

This release maintains full compatibility with Security Fabric configurations from FortiOS 6.4.2 onward, ensuring uninterrupted network operations during migration.

Last Updated: May 15, 2025 | Source: FortiOS 6.4.5 Release Notes, Fortinet Security Advisories

: CVE-2024-21762 vulnerability details
: FortiGate firmware naming conventions
: Firmware upgrade procedures and compatibility guidelines
: Historical firmware version specifications
: Hardware-specific performance benchmarks

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