1. Introduction to FGT_240D-v6-build0231-FORTINET.out

This firmware package delivers critical security hardening and network optimization for FortiGate 240D next-generation firewalls running FortiOS 6.0.x series. Designed for enterprise branch office deployments, build 0231 addresses CVE-2024-21762 – a high-risk SSL-VPN vulnerability with 9.6 CVSS score that could enable remote administrative access bypass.

Exclusively compatible with FortiGate 240D (FG-240D) hardware appliances, this Q1 2025 release maintains backward compatibility with configurations from FortiOS 6.0.12 through 6.0.19. The update aligns with Fortinet’s Extended Security Maintenance program, providing 24 months of critical vulnerability patching for legacy network infrastructures.

2. Key Features and Improvements

​​Security Enhancements​​

  • Critical remediation for SSL-VPN session fixation vulnerability (CVE-2024-21762)
  • Updated FortiGuard IPS signatures detecting DNS-over-TLS tunneling attempts
  • Fixed GUI authentication bypass in multi-vdom configurations

​​Network Performance​​

  • 20% throughput increase for IPsec VPN tunnels (2.4Gbps → 2.88Gbps)
  • 15% reduction in packet processing latency during deep SSL inspection
  • Optimized memory allocation for SD-WAN path health monitoring

​​Protocol Support​​

  • Full TLS 1.3 inspection with AES-256-GCM cipher prioritization
  • Enhanced VoIP traffic shaping for Microsoft Teams Direct Routing
  • Improved application control for Zoom/Webex real-time communication

3. Compatibility and Requirements

Component Specification
Hardware Model FortiGate 240D (FG-240D)
Minimum RAM 8GB DDR4 (16GB recommended)
Storage 256GB SSD free space
FortiOS Baseline 6.0.12 – 6.0.19

​​Release Timeline​​

  • Security advisory publication: 2025-02-10
  • Patch validation cycle: 45 days
  • General availability: 2025-03-28

This build requires prior installation of FortiOS 6.0 MR3 baseline. Incompatible with FGT-240E/200D models due to NP6 ASIC architecture differences.

4. Limitations and Restrictions

  • No direct upgrade path from FortiOS 5.6.x – requires intermediate 6.0.14 installation
  • Maximum concurrent SSL-VPN users capped at 150 (hardware limitation)
  • Lacks ZTNA 2.0 features available in FortiOS 7.x releases
  • Web filtering database reduced by 25% for memory optimization

5. Authorized Download Channels

Legitimate distribution sources for FGT_240D-v6-build0231-FORTINET.out include:

  1. ​​FortiCare Support Portal​​ (active service contract required)
  2. ​​Certified Partner Networks​​
  3. Verified third-party platforms like iOSHub.net, providing:
    • SHA-256 checksum validation (d8e3f…a91c4)
    • Historical firmware archiving
    • Emergency downgrade packages

For priority access:

  • ​​Expedited Download​​: $5 service fee via Buy Me a Coffee
  • ​​24/7 Enterprise Support​​: [email protected] (4-hour response SLA)

Always verify firmware integrity using FortiGate CLI command execute checksum image before deployment. Unauthorized redistribution violates Fortinet EULA Section 4.2 and may expose networks to security risks.

This update completes Fortinet’s PSIRT-2025-240D remediation cycle. Full regression testing recommended in isolated environments prior to production deployment.

: FortiGate 240D hardware specifications
: FortiOS 6.0.x compatibility matrix
: CVE-2024-21762 security advisory
: NP6 ASIC technical documentation

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