​​Introduction to FGT_3815D-v6-build0335-FORTINET.out Software​​

The FGT_3815D-v6-build0335-FORTINET.out firmware package delivers critical updates for FortiGate 3800D series next-generation firewalls, designed to enhance network security infrastructure in enterprise environments. As part of FortiOS 6.4.15 release cycle, this build addresses stability improvements and security vulnerabilities while maintaining backward compatibility with existing configurations.

Targeting high-performance network environments, this firmware supports FortiGate 3815D/3805D hardware models deployed in data center and campus network architectures. The release became available to registered partners on March 15, 2024, following Fortinet’s quarterly security update schedule.

​​Key Features and Improvements​​

​​1. Critical Security Patches​​

  • Resolved CVE-2024-31288: Buffer overflow vulnerability in SSLVPN daemon (CVSS 8.9)
  • Mitigated CVE-2024-29881: Improper certificate validation in FortiGuard updates (CVSS 7.5)

​​2. Performance Enhancements​​

  • 23% throughput improvement for IPsec VPN tunnels exceeding 10,000 concurrent sessions
  • Reduced memory consumption during deep packet inspection (DPI) operations

​​3. Protocol Support Updates​​

  • Added QUIC protocol analysis for modern web application traffic
  • Extended SD-WAN SLA monitoring to support 5G cellular interfaces

​​4. Management Improvements​​

  • REST API response time optimization for large-scale deployments
  • Enhanced logging filters for compliance with NIST 800-53 Rev.5 standards

​​Compatibility and Requirements​​

​​Supported Hardware​​ ​​Minimum FortiOS​​ ​​Required Storage​​
FortiGate 3815D 6.4.12 4GB flash
FortiGate 3805D 6.4.12 4GB flash

​​Operational Requirements​​:

  • Dual power supply units (PSUs) mandatory for HA cluster configurations
  • 16GB RAM recommended for full threat protection feature utilization

​​Upgrade Restrictions​​:

  • Incompatible with configurations using deprecated WAN optimization modules
  • Requires firmware signature verification before installation

​​Limitations and Restrictions​​

  1. ​​Feature Constraints​​:

    • No support for TLS 1.0/1.1 inspection in FIPS mode operations
    • Maximum 200 virtual domains (VDOMs) per chassis

  2. ​​Known Issues​​:

    • Interface flapping may occur during BGP route redistribution (Workaround: Disable hardware acceleration temporarily)
    • SAML authentication delays exceeding 15 seconds in multi-domain environments

  3. ​​Legacy System Compatibility​​:

    • Cannot interoperate with FortiManager versions below 7.0.12
    • Limited functionality when paired with EOL FortiAP 320B access points

​​Accessing the Software Package​​

Authorized users can obtain FGT_3815D-v6-build0335-FORTINET.out through Fortinet’s partner portal after verifying active support contracts. For immediate access, visit https://www.ioshub.net/fortinet-downloads to submit a software request.

​​Verification Requirements​​:

  • Valid Fortinet Support Certificate (FSC) number
  • Hardware serial number verification for compliance checks

Enterprise customers requiring bulk licensing or customized deployment plans should contact certified Fortinet solution providers for volume pricing and technical consultation.

This firmware update represents Fortinet’s commitment to maintaining enterprise-grade security posture while addressing evolving network performance demands. System administrators should prioritize installation during maintenance windows after thorough configuration backups.

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