CVE-2021-4477 — AI Deep Analysis Summary

🚨 **Essence**: Access Control Error in Belden Hirschmann HiLCOS OpenBAT. <br>🔥 **Consequences**: IPv6 IPsec deployment allows **Firewall Bypass**.…

🛡️ **CWE-284**: Improper Access Control. <br>❌ **Flaw**: The device fails to enforce firewall policies correctly when handling IPv6 IPsec traffic. The security boundary is breached at the network layer.

🏭 **Vendor**: Belden. <br>📦 **Product**: Hirschmann HiLCOS OpenBAT (Industrial Wireless LAN). <br>⚠️ **Scope**: Specifically affects deployments using **IPv6 IPsec** configurations.

💻 **Hackers Can**: Bypass security filters. <br>📂 **Impact**: High Confidentiality & Integrity loss (CVSS C:H, I:H).…

⚡ **Threshold**: LOW. <br>🔓 **Auth**: None required (PR:N). <br>🌐 **Access**: Network accessible (AV:N). <br>🎯 **Complexity**: Low (AC:L). No user interaction needed (UI:N). Easy to exploit remotely.

🕵️ **Public Exploit**: No specific PoC listed in data. <br>📜 **References**: Vendor advisory (BSECV-1v0-2019-09) and VulnCheck report exist.…

🔍 **Check**: Scan for **Belden Hirschmann HiLCOS OpenBAT** devices. <br>📡 **Feature**: Verify if **IPv6 IPsec** is enabled. <br>🛠️ **Tool**: Use network scanners to identify the specific industrial wireless LAN hardware.

🩹 **Fix**: Yes, official vendor advisory exists. <br>📄 **Doc**: Belden Security Bulletin BSECV-1v0-2019-09. <br>✅ **Action**: Update firmware/software to the patched version provided by Belden.

🚧 **Workaround**: Disable **IPv6 IPsec** if not strictly necessary. <br>🔒 **Mitigation**: Implement strict network segmentation. Monitor VPN traffic logs for anomalies that bypass standard firewall rules.

🔴 **Priority**: HIGH. <br>📈 **CVSS**: 9.1 (Critical). <br>⏱️ **Urgency**: Immediate patching recommended. Industrial control systems are high-value targets; bypassing firewalls is a critical security failure.