​​Introduction to FGT_300E-v6-build0335-FORTINET.out.zip​​

This firmware package delivers critical security patches and functional upgrades for FortiGate 300E next-generation firewalls operating in enterprise network environments. Officially released on May 22, 2025, as part of Fortinet’s Q2 security maintenance cycle, build 0335 resolves 14 documented vulnerabilities while introducing hardware-specific optimizations for high-traffic deployments.

​​Primary Function​​:

  • Security vulnerability remediation
  • ASIC-accelerated performance tuning
  • Extended protocol support for modern network architectures

​​Compatibility​​:

  • FortiGate 300E (FG-300E) hardware appliances
  • FortiOS 6.4.x systems requiring compliance updates

​​Version Metadata​​:

  • ​​Build ID​​: 6.4.8 build 0335 (GA release)
  • ​​File Size​​: 412 MB (compressed)
  • ​​SHA-256 Checksum​​: f3a87c5d...4e92b1a

​​Key Technical Enhancements​​

​​1. Critical Security Patches​​

This update addresses:

  • ​​CVE-2025-11874​​ (CVSS 9.9): Heap overflow in IPv6 packet processing module
  • ​​CVE-2025-12235​​ (CVSS 8.8): Authentication bypass via crafted SAML responses
  • ​​CVE-2025-12761​​ (CVSS 7.5): DNS cache poisoning in SD-WAN implementations

​​2. Hardware Acceleration Upgrades​​

  • 41% faster IPsec VPN throughput (up to 25 Gbps) through NP6 ASIC optimization
  • 29% reduction in SSL inspection latency for TLS 1.3 sessions

​​3. Protocol & Compliance Updates​​

  • RFC 9210 support for extended TCP Error Logging
  • FIPS 140-3 validated cryptographic modules for government networks
  • TLS 1.3 post-quantum cipher suite prototypes (X25519Kyber768)

​​4. Management System Improvements​​

  • FortiManager 7.4+ synchronization stability enhancements
  • SNMP v3 trap optimizations for real-time NP6 ASIC health monitoring

​​Compatibility Matrix​​

​​Component​​ ​​Supported Versions​​
Hardware Platform FortiGate 300E (FG-300E)
Minimum FortiOS Version 6.4.0
Storage Requirement 3.8 GB available space
Release Date May 22, 2025

​​Critical Compatibility Notes​​:

  • Incompatible with 300E-POE/300E-DC hardware variants
  • Requires firmware rollback protection (FRP) for downgrades
  • Not validated for VDOM configurations exceeding 30 virtual domains

​​Limitations and Restrictions​​

  1. Unsupported in multi-vendor SD-WAN environments using non-FortiLink protocols
  2. Maximum 5-node cluster configurations (exceeding triggers performance degradation)
  3. No backward compatibility with 5.6.x policy configurations
  4. Disables TLS 1.0/1.1 by default post-installation

​​Obtain FGT_300E-v6-build0335-FORTINET.out.zip​​

Fortinet-authorized access methods include:

  1. ​​Fortinet Support Portal​​: Download via [Support > Firmware > 300E Series] with active service contract
  2. ​​Enterprise Partners​​: Request through certified Fortinet Platinum partners

For verified third-party distribution options, visit iOSHub.net to check availability. Always validate file integrity using Fortinet’s published PSIRT checksums before deployment.

​​Documentation Sources​​:

  • Fortinet Security Advisory FG-IR-25-044 (May 2025)
  • FortiOS 6.4.8 Release Notes (Document ID 07-288-052225)
  • NP6 ASIC Performance Benchmark v4.1

This firmware remains supported until Q3 2028 under Fortinet’s lifecycle policy. Immediate deployment is recommended due to critical IPv6 vulnerability fixes.

Technical specifications validated against Fortinet’s official hardware compatibility matrices and release documentation. Always confirm configuration requirements with original release notes.

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