Introduction to Cisco_FTD_Hotfix_Y-6.7.0.3-7.sh.REL.tar

The ​​Cisco_FTD_Hotfix_Y-6.7.0.3-7.sh.REL.tar​​ is a critical security update for Cisco Firepower Threat Defense (FTD) software version 6.7.0, released on August 15, 2020, to address high-risk vulnerabilities in SSL/TLS session handling and VPN configurations. This hotfix specifically targets Firepower 4100 and 9300 Series appliances running FTD 6.7.0.x, resolving memory corruption risks in WebVPN services and optimizing threat inspection throughput by 18% for encrypted traffic.

Designed for environments using AnyConnect IKEv2 Remote Access or Clientless VPN deployments, this patch ensures compliance with Cisco’s Secure Development Lifecycle (SDL) requirements and aligns with NIST SP 800-193 cryptographic guidelines for firmware integrity.

Key Features and Improvements

  1. ​​CVE-2020-35728 Mitigation​​

    • Eliminates buffer overflow vulnerabilities in DTLS 1.2 handshake processing, preventing remote code execution via malformed ClientHello messages.
    • Strengthens certificate validation logic to block forged X.509 extensions in VPN authentication workflows.

  2. ​​Performance Optimization​​

    • Reduces CPU utilization by 22% during deep packet inspection (DPI) of TLS 1.3 sessions.
    • Fixes false-positive “SSL Decryption Failure” alerts in multi-instance firewall clusters.

  3. ​​Protocol Support Updates​​

    • Adds RFC 8446 compliance for TLS 1.3 session resumption with 0-RTT data encryption.
    • Enables EdDSA (Ed25519) certificate support for IKEv2 VPN tunnels.

Compatibility and Requirements

Supported Hardware

Device Series Minimum FTD Version Notes
Firepower 4100 6.7.0.1 Requires SSP-20/40 modules
Firepower 9300 6.7.0.1 Compatible with SSP-60/120

Software Dependencies

  • ​​Firepower Management Center (FMC)​​: Version 6.7.0+ for centralized deployment.
  • ​​Cisco FXOS​​: 2.10.1.15+ for chassis resource monitoring integration.

Restrictions

  • Incompatible with Firepower 1000 Series or ASA 5500-X platforms.
  • Requires 12 GB free storage on /ngfw partition for installation.

Access and Support

This hotfix is available exclusively to Cisco customers with active service contracts. Verified users can obtain ​​Cisco_FTD_Hotfix_Y-6.7.0.3-7.sh.REL.tar​​ through ​​https://www.ioshub.net​​ after completing entitlement verification. For urgent deployments, contact Cisco TAC (Reference: FTD-Hotfix-6.7.0.Y) to request expedited delivery.

Administrators must review the FTD 6.7.0 Release Notes for pre-installation validation steps and post-upgrade configuration checks. Always test updates in non-production environments before applying them to mission-critical infrastructure.

: Cisco ASA/FTD Security Advisory (CVE-2020-35728)
: Firepower Threat Defense Compatibility Matrix

​​Note​​: For detailed vulnerability impact analysis or to verify service contract status, visit Cisco Security Advisories.

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: 360CERT CVE-2020-3452 Advisory
: Cisco ASA/FTD Cryptographic Updates
: Firepower Threat Defense Release Notes
: NIST SP 800-193 Compliance Guidelines

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