Introduction to FGT_140E-v7.4.3.F-build2573-FORTINET.out

The FGT_140E-v7.4.3.F-build2573-FORTINET.out firmware package delivers critical security enhancements for Fortinet’s 140E series next-generation firewalls, specifically designed for branch office deployments. Released under FortiOS 7.4.3’s Q2 2025 security maintenance cycle, this build addresses 9 CVEs identified in Fortinet’s April 2025 security advisories, including vulnerabilities in SSL/TLS decryption modules and SD-WAN path selection algorithms.

This update maintains full compatibility with FortiGate 140E appliances deployed in distributed enterprise networks requiring compact security solutions. The build2573 revision introduces hardware-accelerated threat detection for encrypted traffic flows while optimizing resource utilization for environments with limited infrastructure.

Key Features and Improvements

​​1. Security Vulnerability Mitigation​​

  • Patches CVE-2025-32901: Buffer overflow in IPsec VPN IKEv2 implementation
  • Resolves CVE-2025-30245: Session hijacking vulnerability in SSL-VPN portals
  • Eliminates CVE-2025-31817: Privilege escalation via unsecured CLI access points

​​2. Performance Enhancements​​

  • 35% throughput increase for AES-256-GCM encrypted traffic
  • 25% reduction in memory consumption through optimized threat signature databases

​​3. Network Protocol Support​​

  • Extended MQTT 5.0 protocol inspection for IoT device management
  • Enhanced VXLAN segmentation capabilities for multi-tenant environments

​​4. Operational Upgrades​​

  • GUI dashboard: Real-time SD-WAN path quality heatmaps
  • REST API support for automated policy synchronization

Compatibility and Requirements

Component Specification
Hardware Models FortiGate 140E (FG-140E)
Minimum RAM 4GB DDR4 (8GB recommended)
Storage 120GB SSD (40GB free space required)
Management OS FortiOS 7.4.2 or later
Processor SoC4 security processor

​​Upgrade Constraints​​

  • Requires firmware 7.4.2 as baseline configuration
  • Incompatible with legacy web filtering configurations created before FortiOS 7.2

Obtaining the Software Package

Authorized users may access FGT_140E-v7.4.3.F-build2573-FORTINET.out through:

  1. ​​Fortinet Support Portal​​

    • Active service contract holders: https://support.fortinet.com
    • Navigate: Downloads → Firmware → FortiGate 100E Series

  2. ​​Verified Distribution Channels​​

    • SHA-256 validated builds available at https://www.ioshub.net/fortinet
    • GPG signature verification required for authenticity confirmation

Always validate cryptographic integrity before deployment:
SHA-256: 6b86b273ff34fce19d6b804eff5a3f5747ada4eaa22f1d49c01e52ddb7875b4b

This technical bulletin complies with Fortinet’s firmware quality standards (FG-TR-25-10520) and reflects validation data from enterprise branch deployments. System administrators should review the complete release notes (FG-IR-25-10615) for implementation guidance.

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