CVE-2025-7090
📋 TL;DR
A critical stack-based buffer overflow vulnerability in Belkin F9K1122 routers allows remote attackers to execute arbitrary code by manipulating the max_Conn/timeOut parameter in the formConnectionSetting function. This affects Belkin F9K1122 routers running firmware version 1.00.33. The vulnerability is remotely exploitable without authentication.
💻 Affected Systems
- Belkin F9K1122 router
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, persistence, lateral movement to connected devices, and data exfiltration.
Likely Case
Remote code execution allowing attacker to gain full control of the router, modify network traffic, and access connected devices.
If Mitigated
Denial of service if exploit fails or is blocked by network controls.
🎯 Exploit Status
Proof of concept exploit code is publicly available on GitHub. The vulnerability requires no authentication and has straightforward exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: Yes
Instructions:
No official patch available. Contact Belkin support for firmware updates. If update becomes available, download from official Belkin website and apply through router web interface.
🔧 Temporary Workarounds
Disable remote management
allDisable remote access to router management interface to prevent external exploitation
Network segmentation
allIsolate affected routers from critical network segments
🧯 If You Can't Patch
- Replace affected routers with different models or brands
- Implement strict network access controls to limit exposure of router management interface
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface at 192.168.2.1 or using command: curl -s http://192.168.2.1/status.asp | grep FirmwareCheck Version:
curl -s http://192.168.2.1/status.asp | grep -o 'Firmware Version:[^<]*'Verify Fix Applied:
Verify firmware version is no longer 1.00.33. Check that formConnectionSetting endpoint no longer accepts malformed max_Conn/timeOut parameters.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/formConnectionSetting
- Multiple failed buffer overflow attempts
- Abnormal process crashes on router
Network Indicators:
- Unusual traffic patterns to router management interface
- Exploit-specific payloads in HTTP requests
- Unexpected outbound connections from router
SIEM Query:
source="router_logs" AND (url="/goform/formConnectionSetting" AND (param="max_Conn" OR param="timeOut"))