CVE-2023-49074
📋 TL;DR
An unauthenticated denial-of-service vulnerability in the TDDP functionality of TP-Link EAP225 V3 access points allows attackers to send specially crafted network packets that trigger a factory reset. This affects TP-Link AC1350 Wireless MU-MIMO Gigabit Access Point (EAP225 V3) users running vulnerable firmware. The vulnerability requires no authentication and can be exploited remotely.
💻 Affected Systems
- TP-Link AC1350 Wireless MU-MIMO Gigabit Access Point (EAP225 V3)
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers can remotely factory reset the access point, causing complete network disruption, loss of configuration, and potential network reconfiguration attacks.
Likely Case
Remote attackers cause service disruption by resetting the access point to factory defaults, requiring manual reconfiguration.
If Mitigated
With proper network segmentation and access controls, impact is limited to isolated network segments.
🎯 Exploit Status
Exploit requires sending a sequence of specially crafted UDP packets to port 1040. Proof-of-concept code is publicly available in Talos advisory.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check TP-Link for latest firmware updates
Vendor Advisory: https://www.tp-link.com/en/support/download/eap225/v3/#Firmware
Restart Required: Yes
Instructions:
1. Download latest firmware from TP-Link support site. 2. Log into access point web interface. 3. Navigate to System Tools > Firmware Upgrade. 4. Upload firmware file. 5. Wait for reboot.
🔧 Temporary Workarounds
Block TDDP port
linuxBlock UDP port 1040 at network perimeter to prevent remote exploitation
iptables -A INPUT -p udp --dport 1040 -j DROP
ufw deny 1040/udp
Network segmentation
allIsolate access points on separate VLAN to limit attack surface
🧯 If You Can't Patch
- Implement strict network access controls to block UDP port 1040 from untrusted networks
- Monitor for suspicious traffic to UDP port 1040 and alert on factory reset events
🔍 How to Verify
Check if Vulnerable:
Check firmware version in web interface: System > Status > Firmware Version. If version is v5.1.0 Build 20220926, device is vulnerable.Check Version:
Check web interface or use SNMP: snmpwalk -v2c -c public <device_ip> 1.3.6.1.2.1.1.1Verify Fix Applied:
After firmware update, verify version is newer than v5.1.0 Build 20220926. Test by attempting to send TDDP packets to port 1040 - should not trigger factory reset.📡 Detection & Monitoring
Log Indicators:
- Factory reset events in system logs
- Unexpected configuration changes
- TDDP protocol activity
Network Indicators:
- UDP traffic to port 1040 from untrusted sources
- Sequence of small UDP packets to port 1040
SIEM Query:
source.port:1040 AND protocol:udp AND (packet.size < 100 OR packet.count > 3)