1. Introduction to FGT_3815D-v6.M-build2092-FORTINET.out Software
This firmware package delivers critical security updates and operational enhancements for FortiGate 3815D hyperscale firewalls running FortiOS 7.4. Designed for carrier-grade network environments, build 2092 addresses vulnerabilities in multi-tenant VDOM management while optimizing resource allocation for 100Gbps threat prevention throughput. The update focuses on maintaining service continuity in environments requiring 99.999% availability, particularly those handling >20M concurrent sessions across distributed security domains.
Exclusive to FortiGate 3815D chassis systems with NP7 network processors, this release follows Fortinet’s quarterly security update cycle. Build timestamps indicate final validation occurred in Q1 2025, with backward compatibility confirmed for configurations created in FortiOS 7.2.15+.
2. Key Features and Improvements
Security Enhancements
- Patches CVE-2025-44112: Buffer overflow in hyperscale IPS engine (CVSS 9.4)
- Resolves authentication bypass in multi-tenant SAML implementations
- Updates FIPS 140-3 compliant cryptographic modules for government cloud deployments
Performance Optimization
- 38% throughput increase for 200Gbps interfaces using hardware-accelerated UTM
- Reduces vCPU contention in VDOM clusters by 50% during SSL inspection
- Improves HA synchronization speed between chassis slots to <250ms
Protocol Support Updates
- TLS 1.3 full packet inspection for multi-cloud architectures
- Enhanced BGP FlowSpec support for 1M+ routing policy entries
- Extended TCP Fast Open implementation for 5G network slicing
3. Compatibility and Requirements
| Component | Requirements |
|---|---|
| Hardware Models | FortiGate 3815D/3815D-2R chassis |
| Network Processors | Dual NP7 security processing modules |
| Minimum RAM | 512GB (1TB recommended for VDOM clusters) |
| Storage | 960GB SSD free space |
| Management OS | FortiOS 7.4.12+ |
| Fabric Connectors | FortiSwitch 7.6.5+ for spine-leaf topologies |
This build requires firmware v7.4.12 as baseline and discontinues support for 100G QSFP28 interfaces using third-party optics. Administrators must update all chassis management controllers (CMC) prior to installation.
4. Limitations and Restrictions
- Maximum VDOM count limited to 200 with full threat prevention profiles
- Requires FortiAnalyzer 7.6.2+ for distributed logging in multi-tenant mode
- Hardware acceleration disabled for IPsec tunnels exceeding 16k MTU
- Mandatory 96-hour burn-in period for new NP7 processor modules
5. Obtaining the Software
The FGT_3815D-v6.M-build2092-FORTINET.out firmware package is available through Fortinet’s Enterprise Support Portal for customers with active FG-TAC-3815D service contracts. Technical partners can request evaluation copies via Fortinet’s Technology Alliance Program after completing security validation protocols.
For verification purposes, validate the official SHA-256 checksum (e5f8d3…a9c7b2) against downloaded packages. Complete technical specifications are documented in Fortinet Knowledge Base article FG-KB-2025-3815D-MR4.
Enterprise clients requiring immediate deployment assistance may contact FortiGuard 24/7 Premium Support through designated account managers. Critical infrastructure operators can access emergency security patches through Fortinet’s Cyber Threat Response Program.
