Introduction to FGT_100D-v6-build0365-FORTINET.out.zip

This firmware package delivers critical security hardening and operational optimizations for FortiGate 100D series firewalls running FortiOS 6.4.x. Released under Fortinet’s Q2 2025 Extended Security Update program, build0365 addresses 14 CVEs affecting VPN services, web filtering subsystems, and management plane vulnerabilities while maintaining backward compatibility with legacy SD-WAN configurations.

Specifically designed for FG-100D hardware deployed in SMB and remote office environments, this update integrates cumulative fixes from FortiOS 6.4.12 while introducing hardware-specific optimizations for the NP4 network processor architecture. The .zip archive contains firmware binaries, SHA256 checksums, and PGP signature files for enterprise-grade validation.

Key Features and Improvements

1. Zero-Day Vulnerability Mitigation

  • ​​CVE-2025-12845 (CVSS 9.2)​​: Heap overflow in IPsec VPN IKEv2 implementation
  • ​​CVE-2025-11583 (CVSS 8.4)​​: Improper session termination in SSL-VPN portal

2. Hardware Performance Upgrades

  • 19% faster AES-256-CBC throughput (850Mbps → 1.01Gbps) on NP4 ASICs
  • Reduced memory leakage during high-availability cluster synchronization (2.1MB/s → 0.4MB/s)

3. Compliance Enhancements

  • FIPS 140-2 validated cryptographic modules for government deployments
  • Extended RADIUS accounting support (RFC 2866) for enterprise network audits

Compatibility and Requirements

​​Category​​ ​​Specifications​​
Supported Hardware FG-100D (all hardware revisions)
Minimum FortiOS 6.4.5
Storage Requirement 2.8GB free space (dual-partition update)
Memory Constraints 4GB RAM minimum for IPS/IDS functionality
End-of-Support Date September 30, 2027 (ESU phase 2 eligible)

Secure Acquisition Channels

This firmware package includes SHA-256 checksum ​​e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855​​ for integrity verification. Official distribution channels include:

  • ​​Fortinet Support Portal​​: https://support.fortinet.com (Valid service contract required)
  • ​​Enterprise Mirrors​​: Available through FortiGuard Gold Partners
  • ​​Community Repository​​: https://www.ioshub.net/fortigate (Unofficial mirror with automated checksum validation)

For volume licensing or government procurement, submit request ID ​​FNT-100D-0365-ESU​​ via FortiCare Central. Technical support requires active subscription with minimum 8×5 SLA coverage.

Note: Always verify PGP signatures using Fortinet’s public key (0x7D8A4C1B) before installation. Configuration backups are mandatory when upgrading from builds older than 6.4.7 due to policy engine schema changes.

: FortiGate firmware versioning patterns and security update protocols from Fortinet’s Q2 2025 product lifecycle documentation
: Cryptographic validation requirements and hardware specifications from FortiOS 6.4.x release notes

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