CVE-2026-24441
📋 TL;DR
Tenda AC7 routers with firmware V03.03.03.01_cn and earlier transmit administrator credentials in plaintext within HTTP responses. This allows attackers on the same network path to intercept and steal authentication credentials. All users of affected firmware versions are vulnerable.
💻 Affected Systems
- Tenda AC7 wireless router
⚠️ Risk & Real-World Impact
Worst Case
Attackers gain administrative access to the router, enabling full network compromise, traffic interception, malware deployment, and credential theft from connected devices.
Likely Case
Local network attackers obtain router admin credentials, allowing them to modify network settings, redirect traffic, or perform man-in-the-middle attacks.
If Mitigated
With proper network segmentation and monitoring, impact is limited to credential exposure requiring attacker to be on-path.
🎯 Exploit Status
Exploitation requires network access to intercept HTTP traffic. No authentication needed to observe credentials in transit.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.tendacn.com/product/AC7
Restart Required: Yes
Instructions:
1. Check Tenda website for firmware updates. 2. Download latest firmware. 3. Log into router admin interface. 4. Navigate to firmware upgrade section. 5. Upload and install new firmware. 6. Reboot router.
🔧 Temporary Workarounds
Disable HTTP management
allForce HTTPS-only access to router management interface
Network segmentation
allIsolate router management interface to separate VLAN
🧯 If You Can't Patch
- Replace affected routers with different models
- Implement strict network access controls to limit who can reach router management interface
🔍 How to Verify
Check if Vulnerable:
Use network traffic analyzer (Wireshark) to capture HTTP traffic to router admin interface and check for plaintext credentials in responses.Check Version:
Log into router web interface and check firmware version in System Status or About page.Verify Fix Applied:
After firmware update, verify credentials are no longer visible in plaintext HTTP responses using traffic analysis.📡 Detection & Monitoring
Log Indicators:
- Multiple failed login attempts followed by successful login from unusual IP
- Configuration changes from unexpected sources
Network Indicators:
- Unusual traffic patterns to router management interface
- HTTP traffic containing 'password' or 'admin' in plaintext
SIEM Query:
source_ip IN (router_management_ips) AND http_request AND (content CONTAINS 'password=' OR content CONTAINS 'admin=')