CVE-2026-22080
📋 TL;DR
This vulnerability allows attackers on the same network to intercept and decode administrative credentials from Tenda wireless routers. Attackers can gain unauthorized access to router administrative interfaces by capturing Base64-encoded credentials transmitted through the web interface. Affected users include anyone using Tenda F3 or N300 routers with default or custom administrative credentials.
💻 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
Complete compromise of router configuration allowing traffic interception, DNS hijacking, network segmentation bypass, and persistent backdoor installation
Likely Case
Unauthorized administrative access to router leading to configuration changes, network monitoring, and credential harvesting
If Mitigated
Limited to credential exposure without successful authentication if strong unique passwords are used
🎯 Exploit Status
Requires network sniffing capability on same broadcast domain; Base64 decoding is trivial
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.cert-in.org.in/s2cMainServlet?pageid=PUBVLNOTES01&VLCODE=CIVN-2026-0004
Restart Required: Yes
Instructions:
1. Check Tenda website for firmware updates 2. Download latest firmware 3. Access router admin interface 4. Navigate to firmware upgrade section 5. Upload and apply new firmware 6. Reboot router
🔧 Temporary Workarounds
Enable HTTPS for admin interface
allForce HTTPS-only access to administrative interface to encrypt credential transmission
Network segmentation
allIsolate router management interface to dedicated VLAN or management network
🧯 If You Can't Patch
- Change administrative credentials to strong, unique passwords
- Disable remote administration and restrict admin access to wired connections only
🔍 How to Verify
Check if Vulnerable:
Use network sniffer (Wireshark) on same network while accessing router admin interface; look for Base64-encoded credentials in HTTP trafficCheck Version:
Login to router admin interface and check System Status or About page for firmware versionVerify Fix Applied:
Verify credentials are transmitted over HTTPS with proper encryption; check firmware version against patched releases📡 Detection & Monitoring
Log Indicators:
- Multiple failed login attempts from unusual IPs
- Configuration changes from unexpected sources
Network Indicators:
- ARP spoofing activity
- Unusual traffic patterns to router admin interface
SIEM Query:
source_ip=router_management_ip AND (event_type=authentication OR event_type=configuration_change)