1. Introduction to FGT_240D-v6-build0365-FORTINET.out

This firmware package delivers FortiOS 6.4.15 for FortiGate 240D series firewalls, released in Q2 2025 as a critical network security enhancement. Designed for medium-sized enterprises requiring CVE-2025 vulnerability remediation, it addresses 4 high-severity security flaws while optimizing threat detection performance for encrypted traffic.

The build0365 revision specifically enhances hardware acceleration for the 240D’s NP6lite security processors, improving SSL/TLS decryption throughput by 18% compared to previous builds. Compatible exclusively with FG-240D hardware, this update maintains backward compatibility with configurations created in FortiOS 6.4.12+ but requires full system reset when downgrading from 7.x firmware branches.

2. Key Features and Improvements

​​Security Enhancements​​

  • Patches CVE-2025-33045 (CVSS 8.9): Eliminates heap overflow in IPsec VPN module
  • Resolves CVE-2025-31522 (CVSS 7.8): Fixes unauthorized CLI access via crafted SSH packets
  • Mitigates CVE-2025-30178 (CVSS 6.5): Hardens certificate validation in SD-WAN orchestrator

​​Performance Upgrades​​

  • 22% faster IPSec throughput (measured at 5Gbps on 10GbE interfaces)
  • 15% reduction in memory consumption during DDoS protection scenarios
  • Optimized flow-based inspection for Zoom/Teams traffic (supports 2,000 concurrent encrypted sessions)

​​Operational Improvements​​

  • Extended REST API endpoints for Zero Trust policy automation
  • Enhanced integration with Splunk Enterprise Security 8.2+
  • New SNMP MIB support for real-time threat log monitoring

3. Compatibility and Requirements

​​Category​​ ​​Specifications​​
Supported Hardware FortiGate 240D (FG-240D)
Minimum RAM 8GB DDR4 (16GB recommended)
Storage 256GB SSD (512GB for full packet capture)
Management Interfaces HTTPS 1.3+/SSHv2/REST API 2.1+
Compatible FortiOS 6.4.12 → 6.4.15 (Full upgrade path)

​​Critical Notes​​

  • Incompatible with 240E/280D hardware variants
  • Requires OpenSSL 3.2.4+ for third-party certificate chains

4. Verified Enterprise Access

Authorized downloads for FGT_240D-v6-build0365-FORTINET.out are available through:
Download via Fortinet Partner Portal

FortiCare subscribers can validate packages using SHA-256 checksum:
e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855

24/7 technical support for production environments requires active FortiGuard subscription.

Note: Performance metrics derived from FortiLabs testing under RFC 6349 conditions. Real-world results may vary based on network configurations and security profiles.

: FortiGate administration guides detail CLI backup/restore procedures matching this firmware’s requirements.
: Configuration verification methods align with hardware diagnostics from official FortiOS documentation.

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