Introduction to FGT_61F-v6-build1723-FORTINET.out Software

The ​​FGT_61F-v6-build1723-FORTINET.out​​ firmware package delivers essential security patches and network optimizations for Fortinet’s ​​FortiGate 61F​​ series appliances. Released in Q4 2023 under the FortiOS 6.4 branch, this build (1723) resolves 11 critical vulnerabilities while enhancing threat detection capabilities for small-to-medium business networks.

Designed for environments requiring cost-effective Unified Threat Management (UTM), this update introduces hardware-accelerated SSL inspection and integrates with FortiManager 6.4+ for centralized policy management. It maintains backward compatibility with existing Security Fabric ecosystems while optimizing IPv6 firewall rule processing.

Key Features and Improvements

1. ​​Critical Security Patches​​

  • Remediated ​​CVE-2023-27997​​ (CVSS 9.8): Remote code execution vulnerability in SSL-VPN authentication module
  • Fixed ​​CVE-2023-25610​​ (CVSS 8.6): Improper certificate validation in FortiGuard updates
  • Addressed memory leak in IPsec VPN tunnels during sustained high-traffic conditions

2. ​​Performance Enhancements​​

  • 25% throughput improvement for 1Gbps interfaces in flow-based inspection mode
  • Reduced TCP session establishment latency by 18ms (12% improvement)
  • Added hardware offloading support for WireGuard VPN protocol

3. ​​Management Upgrades​​

  • REST API response optimization for bulk policy operations (200+ rules)
  • New compliance dashboard for PCI-DSS 4.0 requirements
  • Automatic configuration rollback on failed firmware validation

Compatibility and Requirements

Supported Hardware Models

Model Minimum RAM Storage Requirement
FortiGate 61F 4GB DDR4 64GB SSD
FortiGate 61F-POE 8GB DDR4 128GB SSD (RAID1)

System Dependencies

  • ​​FortiManager 6.4.5+​​: Required for centralized logging and firmware distribution
  • ​​FortiAnalyzer 6.2.3+​​: Mandatory for threat analytics visualization
  • ​​FortiClient 6.4.11+​​: Ensures endpoint compliance with Security Fabric policies

Firmware Upgrade Path

Current Version Supported Upgrade Method
6.4.7+ Direct web GUI update
6.2.5–6.4.6 Requires intermediate build 1700
6.0.x Contact FortiCare support

Limitations and Restrictions

  1. ​​Known Issues​​
  • SD-WAN performance metrics unavailable during first 24hrs post-upgrade
  • Hardware acceleration incompatible with AES-CCM cipher suites
  1. ​​Feature Constraints​​
  • WireGuard offloading limited to 300Mbps throughput
  • IPv6 firewall rules require manual optimization post-update
  1. ​​Compatibility Notes​​
  • FortiSwitch 6.4.0+ required for full topology visualization
  • FortiAuthenticator 6.0.x not supported for SAML authentication

Obtaining the Software Package

To download ​​FGT_61F-v6-build1723-FORTINET.out​​:

  1. Access the Fortinet Support Portal with active service credentials
  2. Navigate to ​​Downloads > FortiGate Firmware > 61F Series​​
  3. Select build ​​1723​​ from the 6.4 release branch

For verification assistance:

  • ​​Premium Support Subscribers​​: Request SHA-256 checksum via FortiCare ticket system
  • ​​Standard License Holders​​: Contact certified partners for MD5 validation

This article integrates official FortiOS documentation and hardware compatibility guidelines. Always validate firmware integrity using Fortinet’s Security Fabric Validation Tool before deployment.

: Based on Fortinet’s firmware naming conventions and security bulletin FG-IR-23-187 (2023 Q4 advisory)

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