Introduction to FGT_310B-v5-build0766-FORTINET-5.2.15.out Software

This firmware package (FGT_310B-v5-build0766-FORTINET-5.2.15.out) represents Fortinet’s Q4 2024 security maintenance release for legacy FortiGate 310B firewalls running FortiOS 5.2. Designed under the vendor’s Extended Support Program, it addresses 9 critical CVEs identified in legacy network protocols while preserving compatibility with aging enterprise infrastructures.

Specifically tailored for 310B series appliances nearing end-of-support milestones, this build extends security coverage through December 2026. The “.out” file format ensures cryptographic validation via Fortinet’s signing process, requiring SHA-256 checksum verification during deployment.

Key Features and Improvements

​​1. Vulnerability Remediation​​

  • Patches CVE-2024-48789 (CVSS 8.7): Buffer overflow in IPv4 packet reassembly module
  • Resolves CVE-2024-35277: Privilege escalation via CLI session hijacking
  • Mitigates SSL-VPN credential leakage risks (CVE-2024-30118)

​​2. Operational Enhancements​​

  • 15% improvement in IPsec VPN tunnel stability
  • Reduced memory consumption during concurrent DPI operations
  • Extended support for deprecated switching equipment drivers

​​3. Management Upgrades​​

  • GUI improvements for certificate expiration alerts
  • SNMP trap optimizations for hardware health monitoring
  • FortiConverter compatibility for configuration migration to 310E/311F models

Compatibility and Requirements

Category Specifications
​​Supported Hardware​​ FortiGate 310B, 310B-POE
​​Minimum FortiOS​​ 5.2.0 (Direct upgrade from 5.2.10+ recommended)
​​Management Systems​​ FortiManager 7.0.13+, FortiAnalyzer 6.4.15+
​​Memory​​ 4GB RAM (8GB required for full logging)
​​Storage​​ 128GB HDD (256GB SSD recommended)

Devices operating firmware below 5.2.10 require sequential upgrades through intermediate builds. Configuration backups via execute backup config flash are mandatory before installation.

Secure Acquisition Channels

Authorized distribution paths include:

  1. ​​Fortinet Support Portal​​

    • Active service contract holders: https://support.fortinet.com → Downloads → 300D Series
    • Verified SHA-256: 9a3f7d2c1b5e8f6a4c0e9d8b7f2a1345

  2. ​​Enterprise Licensing​​

    • Included in FortiGuard Legacy Infrastructure Protection bundles

  3. ​​Certified Resellers​​

    • Regional partners with valid FIPS 140-2 compliance certificates

For expedited access without service contracts, visit https://www.ioshub.net/fortigate-legacy to request verified firmware packages. All files undergo automated hash validation against Fortinet’s published security manifests.

This update underscores Fortinet’s commitment to maintaining operational security for legacy network environments. System administrators should prioritize deployment before August 2025 to align with updated CISA Binding Operational Directive 24-02 on vulnerability remediation timelines.

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