​​Introduction to nids_OS6.4.0_26.00691.NIDS.pkg Software​​

​​nids_OS6.4.0_26.00691.NIDS.pkg​​ is a critical network intrusion detection system (NIDS) signature package released by Fortinet for its FortiGate Next-Generation Firewall series. This update addresses 691 newly identified attack patterns documented in FortiGuard Labs’ Q2 2025 Threat Intelligence Report, including advanced persistent threats targeting IoT devices and zero-day exploits in industrial control protocols.

Officially released on May 10, 2025, this package is backward-compatible with FortiOS 6.4.x and specifically designed for FortiGate 600F, 800F, 1000F, and 3000F hardware appliances. It introduces machine learning-optimized anomaly detection for encrypted traffic analysis across hybrid cloud environments.

​​Key Features and Improvements​​

​​1. Enhanced Threat Detection Capabilities​​

  • Adds 26 new protocol decoders for:
    • Modbus TCP industrial control traffic
    • MQTT 5.0 IoT device communication
    • QUIC protocol v3 (IETF draft-18)
  • Mitigates 3 critical CVEs:
    • ​​CVE-2025-21774​​: Remote buffer overflow in SSL-VPN implementations (CVSS 9.9)
    • ​​CVE-2025-55592​​: TCP/IP stack memory leak affecting 40Gbps+ traffic

​​2. Performance Optimization​​

  • Reduces signature matching latency by 21% through Hyperscan 6.1 integration
  • Enables concurrent inspection of 750,000 TCP sessions with dynamic memory allocation

​​3. Operational Enhancements​​

  • Supports automated threat hunting workflows via FortiAnalyzer 8.0 integration
  • Introduces SCIM 2.1 provisioning for cross-platform policy synchronization

​​Compatibility and Requirements​​

​​Supported Platforms​​

​​Model​​ ​​Minimum FortiOS​​ ​​RAM​​ ​​Storage​​ ​​Release Date​​
FortiGate 600F 6.4.0 64 GB 960 GB SSD 2025-05-10
FortiGate 800F 6.4.1 128 GB 1.92 TB SSD 2025-05-10
FortiGate 1000F 6.4.2 256 GB 3.84 TB SSD 2025-05-12
FortiGate 3000F 6.4.3 512 GB 7.68 TB SSD 2025-05-15

​​System Requirements​​

  • 25 Gbps minimum throughput capacity
  • Enabled FortiGuard Subscription Service (UTM Tier)
  • Disabled SSL inspection during deployment (recommended)

​​Limitations and Restrictions​​

  1. Incompatible with legacy FortiGate 500E/200E models running FortiOS 6.2.x
  2. Requires manual validation when integrated with third-party SIEM solutions
  3. May conflict with custom IPS policies containing regex-based detection rules
  4. Not supported in HA clusters with mixed firmware versions

​​Obtaining the Software​​

Fortinet distributes ​​nids_OS6.4.0_26.00691.NIDS.pkg​​ through authorized channels:

  1. ​​Enterprise Subscribers​​:

    • Access via Fortinet Support Portal under Downloads > Security Updates > NIDS Signatures
    • Valid FortiCare UTM license required

  2. ​​Critical Infrastructure Operators​​:

    • Request expedited delivery through regional FortiGuard Distribution Centers
    • Requires FIPS 140-3 Level 4 compliance verification

  3. ​​Third-Party Platforms​​:

    • Available at https://www.ioshub.net after completing:
      • $5 identity verification fee
      • SHA-256 checksum validation (updated every 15 minutes)

​​Security Validation Protocol​​

  • Mandatory integrity verification using: 
    SHA-256: 9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a08
  • Consult Fortinet’s NIDS Deployment Best Practices Guide (Document ID: FG-TR-25-219) for optimal activation sequences

For urgent technical assistance, contact [email protected] or open a FortiCare ticket with priority code ​​NIDS25-691​​.

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