CVE-2025-11295
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on Belkin F9K1015 routers via a buffer overflow in the PPPoE setup interface. Attackers can exploit this by sending specially crafted requests to the /goform/formPPPoESetup endpoint. All users of affected Belkin router models are at risk.
💻 Affected Systems
- Belkin F9K1015
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise leading to router takeover, credential theft, network traffic interception, and lateral movement to connected devices.
Likely Case
Router compromise allowing attackers to modify network settings, intercept traffic, or use the device as a foothold for further attacks.
If Mitigated
Limited impact if device is behind firewall with restricted WAN access, though internal threats remain possible.
🎯 Exploit Status
Proof-of-concept exploit code is publicly available on GitHub, making exploitation straightforward for attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: No
Instructions:
No official patch available. Vendor has not responded to disclosure. Consider replacing affected devices or implementing workarounds.
🔧 Temporary Workarounds
Disable PPPoE Interface
allDisable the vulnerable PPPoE setup interface if not required for network operation.
Restrict Web Interface Access
allConfigure firewall rules to restrict access to the router's web management interface (typically port 80/443).
🧯 If You Can't Patch
- Isolate affected routers in separate network segments with strict firewall rules
- Replace vulnerable Belkin routers with supported, patched alternatives
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface at http://[router-ip]/ or using command: telnet [router-ip] (if enabled) and checking version info.Check Version:
curl -s http://[router-ip]/ | grep -i version or check web interface System Status pageVerify Fix Applied:
Verify firmware version is no longer 1.00.10. Since no patch exists, verification requires confirming workarounds are implemented.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/formPPPoESetup with long pppUserName parameters
- Router reboot or configuration changes without authorization
Network Indicators:
- Unusual outbound connections from router IP
- Traffic to/from router on non-standard ports
SIEM Query:
source_ip="router_ip" AND (url_path="/goform/formPPPoESetup" OR (http_method="POST" AND user_agent_contains="curl" OR "python"))🔗 References
- https://github.com/panda666-888/vuls/blob/main/belkin/f9k1015/formPPPoESetup.md
- https://github.com/panda666-888/vuls/blob/main/belkin/f9k1015/formPPPoESetup.md#poc
- https://vuldb.com/?ctiid.327176
- https://vuldb.com/?id.327176
- https://vuldb.com/?submit.661299
- https://github.com/panda666-888/vuls/blob/main/belkin/f9k1015/formPPPoESetup.md
- https://github.com/panda666-888/vuls/blob/main/belkin/f9k1015/formPPPoESetup.md#poc
