CVE-2026-22079
📋 TL;DR
This vulnerability allows attackers on the same network to intercept login credentials transmitted in plaintext during initial setup of Tenda wireless routers. Successful exploitation enables unauthorized access to router administrative interfaces. Users of Tenda F3 and N300 routers are affected.
💻 Affected Systems
- Tenda 300Mbps Wireless Router F3
- Tenda N300 Easy Setup Router
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Attacker gains full administrative control of router, enabling traffic interception, DNS manipulation, network segmentation bypass, and persistent backdoor installation.
Likely Case
Attacker captures administrative credentials and accesses router settings to change configurations, monitor network traffic, or launch further attacks.
If Mitigated
With network segmentation and monitoring, impact limited to credential exposure requiring password reset and investigation.
🎯 Exploit Status
Requires network sniffing capability on same broadcast domain; no authentication needed during vulnerable setup phase
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
Check Tenda website for firmware updates. If available: 1. Download latest firmware 2. Access router admin panel 3. Navigate to firmware upgrade section 4. Upload and apply update
🔧 Temporary Workarounds
Use Wired Connection for Initial Setup
allPerform initial router configuration using wired Ethernet connection instead of wireless to prevent credential interception
Change Default Credentials Immediately
allAfter initial setup, immediately change administrative credentials to prevent use of intercepted credentials
🧯 If You Can't Patch
- Segment router management traffic to isolated VLAN
- Implement network monitoring for ARP spoofing and unusual traffic patterns
🔍 How to Verify
Check if Vulnerable:
Check if router transmits login credentials in plaintext during setup using network analyzer like WiresharkCheck Version:
Login to router admin interface and check firmware version in status/system information pageVerify Fix Applied:
Verify firmware version is updated and test if credentials are encrypted during setup📡 Detection & Monitoring
Log Indicators:
- Multiple failed login attempts from unusual IPs
- Configuration changes from unexpected sources
Network Indicators:
- ARP spoofing activity near router
- Unencrypted HTTP POST requests containing credential parameters
SIEM Query:
source="router_logs" AND (event="login_failure" OR event="config_change") | stats count by src_ip