CVE-2025-9023
📋 TL;DR
A buffer overflow vulnerability in Tenda AC7 and AC18 routers allows remote attackers to execute arbitrary code by manipulating the Time parameter in the formSetSchedLed function. This affects routers running vulnerable firmware versions, potentially giving attackers full control of the device. The vulnerability is remotely exploitable without authentication.
💻 Affected Systems
- Tenda AC7
- Tenda AC18
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, network infiltration, credential theft, and persistent backdoor installation.
Likely Case
Router takeover enabling traffic interception, DNS manipulation, credential harvesting, and lateral movement into connected networks.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering, though internal network compromise remains possible.
🎯 Exploit Status
Public exploit code exists in GitHub repositories, making exploitation straightforward for attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None found in provided references
Restart Required: Yes
Instructions:
1. Check Tenda's official website for firmware updates. 2. Download latest firmware for your model. 3. Access router web interface. 4. Navigate to firmware upgrade section. 5. Upload and apply new firmware. 6. Reboot router.
🔧 Temporary Workarounds
Disable remote management
allPrevent external access to router web interface
Restrict management interface access
allLimit web interface access to specific IP addresses
🧯 If You Can't Patch
- Isolate affected routers in separate network segments
- Implement strict firewall rules blocking all inbound traffic to router management ports (typically 80/443)
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface: Login > System Status > Firmware VersionCheck Version:
No CLI command available; must use web interfaceVerify Fix Applied:
Verify firmware version is no longer 15.03.05.19 or 15.03.06.44📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/SetLEDCfg
- Multiple failed buffer overflow attempts
- Unexpected router reboots
Network Indicators:
- Unusual traffic patterns from router
- Suspicious outbound connections from router
- DNS hijacking attempts
SIEM Query:
source="router_logs" AND (uri="/goform/SetLEDCfg" OR message="buffer overflow" OR message="formSetSchedLed")