CVE-2025-11293
📋 TL;DR
A buffer overflow vulnerability in Belkin F9K1015 routers allows remote attackers to execute arbitrary code by manipulating the max_Conn parameter in the /goform/formConnectionSetting endpoint. This affects users of Belkin F9K1015 routers running firmware version 1.00.10. The vulnerability is remotely exploitable without authentication.
💻 Affected Systems
- Belkin F9K1015 router
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, network infiltration, and potential lateral movement to connected systems.
Likely Case
Router compromise allowing attacker to intercept traffic, modify DNS settings, or create persistent backdoors.
If Mitigated
Limited impact if device is behind firewall with restricted WAN access and proper network segmentation.
🎯 Exploit Status
Proof of concept code is publicly available on GitHub. No authentication required for exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: Yes
Instructions:
No official patch available. Vendor has not responded to disclosure. Consider replacing affected devices.
🔧 Temporary Workarounds
Disable remote management
allDisable WAN access to router management interface
Access router admin panel > Advanced > Remote Management > Disable
Restrict management interface access
allLimit access to router management interface to specific IP addresses
Access router admin panel > Firewall > Access Control > Add rules to restrict port 80/443
🧯 If You Can't Patch
- Replace affected Belkin F9K1015 routers with supported models from different vendors
- Place router behind dedicated firewall with strict inbound rules blocking all unnecessary ports
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via admin panel at 192.168.2.1 or via command: curl -I http://router-ip/Check Version:
Access router web interface at http://192.168.2.1 and check Firmware Version under StatusVerify Fix Applied:
No fix available to verify. Monitor for firmware updates from Belkin.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/formConnectionSetting with manipulated max_Conn parameter
- Multiple failed buffer overflow attempts in web server logs
Network Indicators:
- Unusual traffic patterns to router management interface from external IPs
- POST requests with abnormally long max_Conn values
SIEM Query:
source="router_logs" AND uri="/goform/formConnectionSetting" AND (param="max_Conn" AND length(value)>100)🔗 References
- https://github.com/panda666-888/vuls/blob/main/belkin/f9k1015/formConnectionSetting.md
- https://github.com/panda666-888/vuls/blob/main/belkin/f9k1015/formConnectionSetting.md#poc
- https://vuldb.com/?ctiid.327174
- https://vuldb.com/?id.327174
- https://vuldb.com/?submit.661296
- https://github.com/panda666-888/vuls/blob/main/belkin/f9k1015/formConnectionSetting.md
- https://github.com/panda666-888/vuls/blob/main/belkin/f9k1015/formConnectionSetting.md#poc
