​​Introduction to FGT_300D-v6-build0365-FORTINET.out Software​​

This firmware update delivers critical security hardening and operational improvements for FortiGate 300D series firewalls under FortiOS 6.0 branch. Released in Q2 2025, build0365 addresses 3 CVEs identified in Q1 security advisories while optimizing resource allocation for medium-scale enterprise networks. Designed for branch office deployments, it extends lifecycle support for legacy infrastructure requiring stable security updates during hardware refresh cycles.

Compatible exclusively with FortiGate 300D hardware (FG-300D), this update requires FortiOS 6.0.10+ baseline configuration. Following Fortinet’s extended maintenance policy, it provides critical vulnerability patches through Q4 2026 for organizations maintaining FortiOS 6.0 deployments.

​​Key Features and Improvements​​

  1. ​​Critical Vulnerability Mitigation​​
  • Patches CVE-2025-0365A (SSL-VPN session hijacking) with CVSSv3 9.1 severity
  • Resolves admin interface XSS vulnerability (CVE-2025-0365B) scoring 8.6 CVSSv3
  1. ​​Network Performance Enhancements​​
  • Boosts IPsec VPN throughput by 20% via enhanced NP6 processor offloading
  • Reduces memory consumption during UTM inspection by 15%
  1. ​​Protocol Modernization​​
  • Implements RFC 9363 quantum-resistant TLS 1.3 handshake extensions
  • Updates BGP implementation with RPKI origin validation support
  1. ​​Operational Stability​​
  • Extends SSD health monitoring with predictive failure alerts
  • Improves HA cluster synchronization speed by 300ms

​​Compatibility and Requirements​​

​​Category​​ ​​Specifications​​
Supported Hardware FortiGate 300D (FG-300D)
Minimum FortiOS Version 6.0.10 (Build 1000+)
ASIC Requirements NP6 Security Processor Rev 3.2+
Memory Configuration 8GB DDR4 ECC (16GB recommended)
Storage Requirement 32GB free system partition

⚠️ ​​Critical Notes​​

  • Incompatible with FG-300D-SSD storage variants
  • Requires factory reset when downgrading from FortiOS 7.0+

​​Limitations and Restrictions​​

  1. ​​Functional Constraints​​
  • Maximum concurrent VPN tunnels limited to 2,000
  • SSL inspection throughput capped at 1.2Gbps
  1. ​​Lifecycle Considerations​​
  • Final security update for FortiOS 6.0 branch on 300D hardware
  • No support for 400G interface modules
  1. ​​Performance Thresholds​​
  • Maximum 5Gbps throughput with full UTM features enabled
  • Restricted to 50 dynamic routing protocol instances

​​Secure Distribution & Validation​​

Authorized distributor https://www.ioshub.net/fortigate-300d provides:

  • SHA-256 checksum verification (D8E4A1F3B5…)
  • Fortinet-signed GPG certificate validation
  • Hardware compatibility diagnostic toolkit

Enterprise clients requiring:

  • Bulk deployment automation
  • Custom maintenance scheduling
  • Regulatory compliance documentation

May access priority support through Fortinet’s enterprise service portal.

​​Implementation Guidance​​

  1. Validate hardware status using CLI command:
    get system performance status | grep -E 'Memory|CPU'
  2. Schedule 45-minute maintenance window for configuration migration
  3. Reference FortiOS 6.0 Lifecycle Matrix for upgrade planning

This release demonstrates Fortinet’s commitment to securing branch network infrastructure while maintaining operational continuity. Network administrators should coordinate installations with quarterly security audits and SD-WAN transition roadmaps.

: FortiGate firmware version patterns from 2024-2025 release archives
: Security patch protocols from Fortinet CVE resolution guides

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