CVE-2026-22220
📋 TL;DR
This vulnerability allows a network-adjacent attacker with administrative access to send specially crafted HTTP requests to the TP-Link Archer BE230 router's web interface, causing the web service to become unresponsive and resulting in a denial of service. The device's web interface may stop responding until it recovers automatically or is manually rebooted. This affects TP-Link Archer BE230 v1.2 routers running firmware versions before 1.2.4 Build 20251218 rel.70420.
💻 Affected Systems
- TP-Link Archer BE230
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
An attacker with administrative access could repeatedly exploit this vulnerability to keep the web interface unavailable, preventing legitimate users from managing the router and potentially disrupting network configuration changes.
Likely Case
An attacker with network access and administrative credentials causes temporary web interface unavailability, requiring manual intervention or waiting for automatic recovery.
If Mitigated
With proper network segmentation and access controls, the attack surface is reduced, limiting potential impact to authorized administrators only.
🎯 Exploit Status
Exploitation requires administrative access to the router's web interface, which significantly reduces the attack surface. The vulnerability is in input validation of HTTP requests.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.2.4 Build 20251218 rel.70420 or later
Vendor Advisory: https://www.tp-link.com/us/support/faq/4941/
Restart Required: Yes
Instructions:
1. Log into the router's web interface. 2. Navigate to System Tools > Firmware Upgrade. 3. Download the latest firmware from TP-Link's support site. 4. Upload and install the firmware update. 5. Wait for the router to reboot automatically.
🔧 Temporary Workarounds
Restrict Administrative Access
allLimit administrative access to the router's web interface to trusted IP addresses only.
Disable Remote Management
allEnsure remote management (WAN access to web interface) is disabled if not required.
🧯 If You Can't Patch
- Implement network segmentation to isolate the router's management interface from untrusted networks
- Change default administrative credentials and enforce strong password policies
🔍 How to Verify
Check if Vulnerable:
Check the firmware version in the router's web interface under System Tools > Firmware Upgrade or Status page.Check Version:
No CLI command available; check via web interface at http://router_ip_addressVerify Fix Applied:
Verify the firmware version is 1.2.4 Build 20251218 rel.70420 or later after applying the update.📡 Detection & Monitoring
Log Indicators:
- Multiple failed login attempts followed by web service unavailability
- Web interface access logs showing unusual HTTP request patterns
Network Indicators:
- Unusual HTTP traffic to router's management interface on port 80/443
- Sudden drop in web interface responsiveness
SIEM Query:
source="router_logs" AND (event="web_service_down" OR event="http_error")