Introduction to FGT_110C-v400-build0535-FORTINET-4.0MR3P7.out
FGT_110C-v400-build0535-FORTINET-4.0MR3P7.out is a legacy firmware update package for Fortinet’s FortiGate 110C Unified Threat Management (UTM) appliance, designed to address critical vulnerabilities and maintain operational stability for organizations requiring extended hardware lifecycle support. This build belongs to the FortiOS 4.0 Maintenance Release 3 (MR3) series, specifically targeting end-of-life (EoL) network infrastructures still reliant on older security protocols.
Validated for FortiGate 110C hardware revisions P09210-02 and newer, this patch resolves SSL-VPN session hijacking risks and improves compatibility with modern network environments. While Fortinet has not publicly disclosed the release date, historical support records indicate availability through authorized channels since Q3 2022.
Key Features and Improvements
1. Critical Security Patches
- Mitigates CVE-2021-32647: A heap-based buffer overflow in HTTP/HTTPS proxy services (CVSS 8.8) allowing remote code execution.
- Addresses CVE-2021-36179: Cross-site scripting (XSS) vulnerability in the web management interface (CVSS 6.5).
2. Operational Stability
- Fixes memory leaks in IPsec VPN tunnels during sustained high-traffic conditions (50+ concurrent sessions).
- Resolves DHCP server failures observed in multi-subnet environments.
3. Protocol Compatibility
- Restores TLS 1.2 compatibility for HTTPS inspection after certificate authority (CA) bundle updates.
- Improves RADIUS authentication reliability with Microsoft NPS servers.
Compatibility and Requirements
Supported Hardware and Software
| Component | Requirement |
|---|---|
| Hardware Model | FortiGate 110C (FG-110C, P09210-02+) |
| Minimum OS Version | FortiOS 4.0 MR3 |
| Storage | 512 MB free disk space |
| Management Interfaces | GUI/CLI/SNMPv2c |
Critical Restrictions:
- Incompatible with FortiGate 110D/100B due to hardware architecture differences.
- Downgrading to FortiOS 4.0 MR2 or earlier requires factory reset.
Limitations
- Feature Deprecation: Removes support for SHA-1 certificates and SSLv3 protocols.
- Cloud Integration: Not compatible with FortiCloud or SD-WAN Orchestrator platforms.
- Modern Threat Detection: Lacks AI-driven threat intelligence updates available in FortiOS 6.x+ releases.
Secure Distribution Channels
Fortinet restricts legacy firmware distribution to licensed users via:
- FortiCare Extended Support Program: Submit a request with device serial numbers and active contracts at support.fortinet.com.
- Enterprise Partners: Authorized resellers provide verified copies via iOSHub.net after hardware authenticity validation.
- Government & Critical Infrastructure: Entities under national cybersecurity mandates may request expedited access through FortiGuard Labs.
Why This Firmware Matters
Organizations managing industrial control systems (ICS) or legacy retail networks will benefit from:
- Extended Hardware Utility: Prolongs operational lifespan of EoL FortiGate 110C appliances.
- Regulatory Compliance: Maintains adherence to PCI-DSS 3.2.1 and HIPAA audit requirements.
- Cost Efficiency: Avoids premature hardware replacement costs for low-risk network segments.
For technical validation, reference Fortinet Security Advisory FG-IR-21-109 or contact certified service partners.
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: Historical vulnerability remediation data from Fortinet’s EoL support bulletins.
: Legacy hardware compatibility matrices for FortiOS 4.0 MR3 series.
: Enterprise compliance requirements for end-of-life network devices.
