CVE Alert: CVE-2025-11294 – Belkin – F9K1015
CVE-2025-11294
A vulnerability was detected in Belkin F9K1015 1.00.10. Affected by this issue is some unknown functionality of the file /goform/formL2TPSetup. The manipulation of the argument L2TPUserName results in buffer overflow. The attack may be launched remotely. The exploit is now public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
AI Summary Analysis
Risk verdict
Why this matters
Most likely attack path
Who is most exposed
Detection ideas
- Unusual router reboots or memory/resource depletion traces in device logs.
- Anomalous L2TP setup requests or malformed L2TPUserName fields observed on the device.
- Signs of post-exploitation activity: unexpected configuration changes, new VPN sessions, or traffic patterns indicative of data exfiltration.
- Public PoC activity signatures or known IOCs from CTI feeds.
- Sudden spikes in network traffic to/through the WAN interface.
Mitigation and prioritisation
- Apply the latest firmware patch from Belkin; upgrade to a non-affected release if available.
- Disable remote management and limit WAN exposure; enforce strict access controls.
- Implement network segmentation and monitor VPN/L2TP endpoints; disable unused services.
- Validate change-management processes and schedule a firmware upgrade within the next maintenance window.
- Consider compensating controls: firewall rules blocking unauthorized L2TP traffic, IDS/IPS signatures for buffer overflow patterns.
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