CVE-2026-22081
📋 TL;DR
This vulnerability allows remote attackers to capture session cookies from Tenda wireless routers due to missing HTTPOnly flags and insecure HTTP transmission. Attackers can use stolen cookies to gain unauthorized administrative access to the router's web interface. Affected devices include Tenda 300Mbps Wireless Router F3 and N300 Easy Setup Router models.
💻 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 administrative access leading to network traffic interception, DNS hijacking, credential theft from connected devices, and persistent backdoor installation.
Likely Case
Unauthorized access to router configuration allowing network settings modification, connected device monitoring, and potential credential harvesting from administrative interface.
If Mitigated
Limited impact with proper network segmentation, HTTPS enforcement, and regular credential rotation preventing successful cookie theft and reuse.
🎯 Exploit Status
Exploitation requires cookie interception via man-in-the-middle attacks or network sniffing, but no authentication bypass needed once cookies are captured.
🛠️ 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 for your model. 3. Access router admin interface. 4. Navigate to firmware upgrade section. 5. Upload and apply new firmware. 6. Reboot router after completion.
🔧 Temporary Workarounds
Enable HTTPS-only access
allForce administrative interface to use HTTPS only, preventing HTTP cookie transmission
Network segmentation
allIsolate router management interface to separate VLAN or restrict access to trusted IPs only
🧯 If You Can't Patch
- Disable remote administration and restrict web interface to local network only
- Implement regular credential rotation and monitor for unauthorized configuration changes
🔍 How to Verify
Check if Vulnerable:
Inspect browser developer tools while accessing router admin interface - check if session cookies lack HTTPOnly flag and are transmitted over HTTPCheck Version:
Login to router admin interface and check firmware version in System Status or About sectionVerify Fix Applied:
Verify cookies now have HTTPOnly flag set and all administrative traffic uses HTTPS📡 Detection & Monitoring
Log Indicators:
- Multiple failed login attempts followed by successful login from unusual IP
- Configuration changes from unexpected sources
Network Indicators:
- HTTP traffic to router admin interface containing session cookies
- Unusual administrative access patterns
SIEM Query:
source_ip=router_management_interface AND (http_cookie CONTAINS "session" OR http_cookie CONTAINS "auth")