CVE-2025-11299
📋 TL;DR
A buffer overflow vulnerability in Belkin F9K1015 routers allows remote attackers to execute arbitrary code by manipulating the pppUserName parameter. This affects Belkin F9K1015 routers running firmware version 1.00.10. Attackers can exploit this without authentication to potentially take control of affected devices.
💻 Affected Systems
- Belkin F9K1015
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, network infiltration, and persistent backdoor installation.
Likely Case
Router compromise allowing traffic interception, DNS manipulation, and lateral movement into connected networks.
If Mitigated
Denial of service or limited impact if network segmentation and proper firewall rules are in place.
🎯 Exploit Status
Proof-of-concept exploit 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 WAN Management
allDisable remote management/administration from WAN interface
Network Segmentation
allIsolate router management interface to trusted network segments only
🧯 If You Can't Patch
- Replace affected Belkin F9K1015 routers with supported/patched alternatives
- Implement strict firewall rules blocking all external access to router management interfaces
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface at http://[router-ip]/ or using command: telnet [router-ip] 80 and examine response headersCheck Version:
curl -I http://[router-ip]/ | grep ServerVerify Fix Applied:
No fix available to verify. Monitor for vendor firmware updates.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/formWanTcpipSetup with long pppUserName parameters
- Multiple failed buffer overflow attempts
Network Indicators:
- Unusual traffic patterns from router after exploitation
- Outbound connections from router to unknown IPs
SIEM Query:
source="router_logs" AND uri="/goform/formWanTcpipSetup" AND parameter="pppUserName" AND length(value)>100🔗 References
- https://github.com/panda666-888/vuls/blob/main/belkin/f9k1015/formWanTcpipSetup.md
- https://github.com/panda666-888/vuls/blob/main/belkin/f9k1015/formWanTcpipSetup.md#poc
- https://vuldb.com/?ctiid.327180
- https://vuldb.com/?id.327180
- https://vuldb.com/?submit.661303
- https://github.com/panda666-888/vuls/blob/main/belkin/f9k1015/formWanTcpipSetup.md
- https://github.com/panda666-888/vuls/blob/main/belkin/f9k1015/formWanTcpipSetup.md#poc
