CVE-2026-2181
📋 TL;DR
A stack-based buffer overflow vulnerability exists in Tenda RX3 router firmware version 16.03.13.11. Attackers can remotely exploit this by manipulating the schedStartTime/schedEndTime parameters in the /goform/openSchedWifi endpoint, potentially leading to arbitrary code execution. This affects all users running the vulnerable firmware version.
💻 Affected Systems
- Tenda RX3
⚠️ 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
Remote attackers could execute arbitrary code with router privileges, potentially gaining full control of the device, intercepting network traffic, or using it as a foothold for further attacks.
Likely Case
Remote code execution leading to router compromise, enabling attackers to modify settings, intercept traffic, or deploy malware to connected devices.
If Mitigated
If properly segmented and monitored, impact could be limited to the router itself without lateral movement to other network segments.
🎯 Exploit Status
Exploit details are publicly available, making this relatively easy to weaponize for attackers with basic skills.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.tenda.com.cn/
Restart Required: Yes
Instructions:
1. Check Tenda website for firmware updates. 2. Download latest firmware for RX3. 3. Upload via router admin interface. 4. Apply update and restart router.
🔧 Temporary Workarounds
Disable remote administration
allPrevent external access to router administration interface
Network segmentation
allIsolate router management interface to separate VLAN
🧯 If You Can't Patch
- Replace affected router with different model/brand
- Implement strict network access controls to limit exposure
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface; if version is 16.03.13.11, device is vulnerable.Check Version:
Check via router web interface or SSH if available: cat /proc/version or similar firmware version commandVerify Fix Applied:
Verify firmware version has been updated to a version later than 16.03.13.11.📡 Detection & Monitoring
Log Indicators:
- Unusual requests to /goform/openSchedWifi with manipulated parameters
- Router crash/restart logs
Network Indicators:
- Exploit traffic patterns targeting router management interface
- Unusual outbound connections from router
SIEM Query:
source_ip=router AND (url_path="/goform/openSchedWifi" AND (param="schedStartTime" OR param="schedEndTime"))