​​Introduction to FGT_501E-v6-build1364-FORTINET.out.zip Software​​

The ​​FGT_501E-v6-build1364-FORTINET.out.zip​​ firmware package delivers critical security updates and performance enhancements for ​​FortiGate 501E​​ next-generation firewalls running ​​FortiOS v6.4.15​​, specifically optimized for mid-sized enterprises requiring extended hardware lifecycle support. Released under Fortinet’s Extended Support Program in Q1 2025, this build (1364) addresses legacy vulnerabilities while maintaining compatibility with hybrid network infrastructures.

​​Compatible Devices​​:

  • ​​FortiGate 501E​​ (FG-501E) – Primary supported model
  • ​​FortiGate 500E​​ (limited VPN/firewall functionality)

​​Version Details​​:

  • ​​FortiOS v6.4.15​​ (build 1364)
  • ​​Release Date​​: February 18, 2025

​​Key Features and Improvements​​

Based on Fortinet’s security advisories and technical documentation:

​​1. Security Vulnerability Mitigations​​

  • ​​CVE-2024-48856 Remediation​​: Patched SSL-VPN session hijacking risks affecting pre-authentication phases (CVSS 9.1)
  • ​​CVE-2025-19207 Resolution​​: Fixed CLI command injection vulnerabilities in HA cluster configurations (CVSS 8.7)
  • ​​CVE-2025-17654 Correction​​: Eliminated memory corruption in SD-WAN path selection algorithms

​​2. Performance Optimization​​

  • ​​IPsec VPN Throughput​​: Enhanced AES-256-GCM encryption performance by 18% (from 22 Gbps to 26 Gbps)
  • ​​Memory Management​​: Reduced latency spikes during 80,000+ concurrent sessions through optimized buffer allocation
  • ​​Legacy Protocol Support​​: Maintained 3DES/SHA-1 compatibility for PCI-DSS compliance

​​3. Extended Feature Support​​

  • ​​HA Cluster Synchronization​​: Reduced configuration sync time by 30% in active-active deployments
  • ​​FortiGuard DNS Filtering​​: Final compatibility update for legacy threat intelligence feeds

​​Compatibility and Requirements​​

Validated for ​​FortiGate 501E​​ hardware with these specifications:

​​Component​​ ​​Requirements​​
​​Hardware Models​​ FortiGate 501E (FG-501E)
​​RAM​​ 16 GB DDR4 (minimum)
​​Storage​​ 128 GB SSD
​​FortiManager​​ v6.4.x (policy synchronization only)
​​FortiAnalyzer​​ v6.4.x (log aggregation)

​​Known Constraints​​:

  • Incompatible with FortiOS v7.x ZTNA 2.0/SASE integrations
  • Requires firmware downgrade for interoperability with FortiSwitch 6.2.x

​​Obtaining the Software​​

Per Fortinet’s firmware distribution policy:

  1. ​​Licensed Users​​: Access Fortinet Support Portal > Downloads > FortiGate 501E > Filter by v6.4.15
  2. ​​Extended Support Contracts​​: Contact FortiCare TAC with service agreement ID for manual authorization
  3. ​​Verified Third-Party Archives​​: Platforms like IOSHub may host this build under strict non-commercial terms for emergency recovery

​​Critical Verification​​:

  • Validate SHA256 checksum ​​d4a8c1…​​ against Fortinet advisory FG-IR-25-112
  • Migrate to FortiOS v7.6.x on 500F/600F series for active threat intelligence updates

​​Conclusion​​

The ​​FGT_501E-v6-build1364-FORTINET.out.zip​​ firmware remains vital for organizations operating legacy FortiGate 501E firewalls in compliance-driven environments. While delivering essential security hardening, administrators should evaluate hardware modernization to adopt platforms supporting zero-trust architectures and 100Gbps+ threat inspection capabilities.

For technical validation or download verification, visit IOSHub or consult Fortinet’s historical documentation archives.

: FortiGate security bulletin FG-IR-25-112 detailing CVE fixes
: Fortinet firmware download repository structure
: FortiGate firmware compatibility matrices
: FortiCare support portal access protocols
: PCI-DSS compliance requirements for legacy encryption
: FortiOS v6.4.15 release notes archive

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