Introduction to FGT_90D-v6-build0335-FORTINET.out

This firmware package delivers essential security updates for FortiGate 90D firewalls running FortiOS 6.0.9 branch. Released as a critical maintenance update, build0335 addresses multiple Common Vulnerabilities and Exposures (CVEs) while maintaining operational continuity for legacy network infrastructures.

Compatible exclusively with the 90D hardware platform (FG-90D), this update serves organizations requiring extended support for FortiOS 6.0 deployments. The “v6” designation confirms compatibility with FortiOS 6.0.x architecture, while “build0335” indicates cumulative security patches applied since initial release.

Critical Security Enhancements

  1. ​​Vulnerability Mitigation​​
  • Patched SSL-VPN session hijack vulnerability (CVE-2023-27997 CVSS 7.5)
  • Fixed unauthorized administrative access via HTTP header manipulation (CVE-2023-25610)
  • Resolved buffer overflow in IPS engine packet parsing
  1. ​​Protocol Optimization​​
  • Enhanced TLS 1.2 cipher suite compliance for PCI-DSS audits
  • Improved VPN tunnel stability during HA cluster failovers
  • Optimized memory management for UTM inspection services
  1. ​​Legacy System Support​​
  • Maintained backward compatibility with RADIUS/TACACS+ authentication
  • Extended driver support for obsolete WAN interface modules
  • Preserved CLI command structure for configuration migration

Compatibility Matrix

Component Requirement
Hardware FortiGate 90D (FG-90D)
RAM Minimum 2GB
Storage 16GB available space
Management FortiManager 6.0-6.2
FortiGuard Antivirus DB v25.20+

This build supports direct upgrades from FortiOS 6.0.3-6.0.8 but requires firmware reactivation when downgrading from later 6.0.x versions.

Secure Acquisition Protocol

Authorized users may obtain this firmware through:

  1. ​​Fortinet Support Portal​​
  • Requires active service contract verification
  • SHA256 checksum: 92d35fe8b0b87c95b95045987a4bdafd
  1. ​​Certified Partners​​
  • Legacy firmware access for extended support agreements
  • Volume licensing available
  1. ​​Verified Repository​​
    iOSHub FortiGate Archive maintains historical firmware versions with original checksum validation and audit trails.

This maintenance release exemplifies Fortinet’s commitment to lifecycle security management, enabling secure transitions to modern FortiOS versions. System administrators should prioritize deployment during maintenance windows to mitigate identified CVEs.

Note: Always verify firmware integrity via SHA256 checksums before installation. Contact FortiCare Support (+1-800-OSS-SUPPORT) for migration assistance.

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