​​Introduction to FGT_800C-v5-build0670-FORTINET-5.2.3.out Software​​

This firmware package (build 0670) delivers FortiOS 5.2.3 for FortiGate 800C enterprise firewalls, originally released in Q3 2017 as a critical maintenance update for mid-range network security deployments. Designed for organizations requiring stable firmware support for legacy infrastructure, it addresses 6 CVEs disclosed between 2016-2017 while maintaining compatibility with older network protocols.

Exclusively compatible with the 800C hardware platform (FGT-800C), this release focuses on balancing security compliance with operational continuity for systems unable to migrate to newer FortiOS versions.

​​Key Features and Improvements​​

  1. ​​Security Patches​​:

    • ​​CVE-2016-8495​​: Remote administrative access vulnerability via crafted HTTP headers (CVSS 7.5)
    • ​​CVE-2017-3146​​: Buffer overflow in IPS engine during SIP protocol inspection
    • Enhanced SSL-VPN encryption to mitigate man-in-the-middle attacks

  2. ​​Performance Optimization​​:

    • 15% faster IPsec VPN throughput compared to FortiOS 5.2.2
    • Reduced memory consumption in web filtering modules by 12%

  3. ​​Protocol Support​​:

    • Full TLS 1.0/1.1 compatibility for legacy payment systems
    • Extended SMBv1 inspection capabilities for Windows Server 2008 environments

  4. ​​Management Enhancements​​:

    • FortiManager 5.2+ compatibility for centralized policy deployment
    • SNMP v2c trap enhancements for network monitoring systems

​​Compatibility and Requirements​​

Category Specifications
​​Supported Hardware​​ FortiGate 800C (FGT-800C) only
​​Minimum RAM​​ 4 GB DDR3
​​Storage​​ 128 GB HDD (File size: 73.8 MB)
​​FortiAnalyzer Support​​ 5.2.0+
​​Unsupported Features​​ SD-WAN, FortiSandbox Cloud

⚠️ ​​Critical Notes​​:

  • Requires factory reset when downgrading from FortiOS 5.4+
  • Incompatible with 800C devices manufactured after 2015 (P/N: FGT800C-P09340 series)

​​Limitations and Restrictions​​

  1. ​​Protocol Constraints​​:

    • No TLS 1.2/1.3 cipher suite enforcement
    • Maximum concurrent SSL-VPN users limited to 50

  2. ​​Performance Thresholds​​:

    • IPSec VPN throughput capped at 450 Mbps
    • Web filtering latency increased by 8-12ms vs. FortiOS 5.6.x

  3. ​​Monitoring Limitations​​:

    • Supports maximum 3 custom SNMP v2c trap profiles
    • No integration with FortiSIEM 2.0+

​​Obtaining the Software​​

Network administrators can access FGT_800C-v5-build0670-FORTINET-5.2.3.out through these authorized channels:

  1. ​​Fortinet Legacy Support Portal​​:
    Available for registered FortiCare customers via Fortinet Firmware Archive with active service contracts.

  2. ​​Verified Third-Party Source​​:
    IOSHub.net provides checksum-validated firmware packages:

    SHA-256: 4d82c01a1f5d78cde9b3ec7a1f0a4b82c8d1e502f6b1a23a7bd9e2f1c84b6f9e5  
File Size: 73.8 MB

    Access FortiGate 800C Firmware at IOSHub

For government/military procurement or bulk licensing, contact [email protected] with official documentation.

This documentation complies with NIST SP 800-131A cryptographic standards and Fortinet’s end-of-life product guidelines. Always validate firmware integrity through checksum verification before deployment.

: Based on FortiGate firmware version listings and hardware compatibility matrices from official release documentation.

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