CVE-2020-8614
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on Askey AP4000W devices by sending specially crafted packets to the bd_svr service on TCP port 54188. Attackers can gain full control of affected devices without authentication. Only Askey AP4000W devices with TDC_V1.01.003 firmware are affected.
💻 Affected Systems
- Askey AP4000W
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise leading to network infiltration, data theft, ransomware deployment, or use as botnet nodes.
Likely Case
Device takeover for credential harvesting, network reconnaissance, or launching attacks against internal systems.
If Mitigated
Limited impact if devices are isolated in separate VLANs with strict firewall rules blocking port 54188.
🎯 Exploit Status
Public exploit details available in the referenced blog posts. Attack requires only network access to port 54188.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: No
Instructions:
No official patch available. Check with Askey for firmware updates or follow workarounds below.
🔧 Temporary Workarounds
Block Port 54188
linuxBlock all inbound and outbound traffic to TCP port 54188 using firewall rules.
iptables -A INPUT -p tcp --dport 54188 -j DROP
iptables -A OUTPUT -p tcp --dport 54188 -j DROP
Network Segmentation
allIsolate Askey AP4000W devices in separate VLANs with strict access controls.
🧯 If You Can't Patch
- Immediately disconnect affected devices from networks until mitigation can be applied.
- Replace vulnerable devices with alternative products if no firmware update is available.
🔍 How to Verify
Check if Vulnerable:
Check if device responds on TCP port 54188: nmap -p 54188 <device_ip>Check Version:
Check device web interface or console for firmware version TDC_V1.01.003Verify Fix Applied:
Verify port 54188 is no longer accessible: telnet <device_ip> 54188 (should timeout/fail)📡 Detection & Monitoring
Log Indicators:
- Unusual process execution from bd_svr service
- Failed authentication attempts if service modified
Network Indicators:
- Unusual traffic to/from port 54188
- Suspicious payloads in packets to port 54188
SIEM Query:
destination_port=54188 AND (payload_size>100 OR protocol_anomaly=true)