CVE Alert: CVE-2025-12225 – Tenda – AC6

Risk verdict

High risk of remote code execution on Tenda AC6 via the WifiGuestSet stack overflow; public PoC available and advisory indicates active exploitation risk—patch prioritisation recommended.

Why this matters

The vulnerability yields full control over the device (C/H I/H A/H). In networked deployments, an attacker could reliably compromise the router, exfiltrate data, or pivot to the LAN, with impact on confidentiality, integrity and availability.

Most likely attack path

An attacker with network access and low-privilege credentials can target the HTTP endpoint /goform/WifiGuestSet, supply a crafted shareSpeed value, trigger a stack-based overflow and gain code execution. No user interaction is required; PoC exists and public disclosure increases likelihood of widespread attempts. Exploitation could then enable sustained access or device takeover.

Who is most exposed

Common in consumer/home and small-business networks using Tenda AC6 devices; any deployment with WAN-facing management interfaces or weak credentials elevates risk. Organisations onboarding such devices or exposed remote management are particularly vulnerable.

Detection ideas

• Monitor for anomalous HTTP requests to /goform/WifiGuestSet with unusual shareSpeed payloads.
• Look for crashes, reboots, or memory-corruption symptoms in device logs after targeted requests.
• IDS/IPS signatures or PoC indicators tied to this CVE (signature-based indicators).
• Unusual spikes in device CPU/memory or failed login attempts on web admin interfaces.

Mitigation and prioritisation

• Apply vendor patch to affected firmware as soon as available; verify integrity before rollout.
• If patching is delayed, disable WAN/remote management and restrict admin access to trusted networks; enforce strong credentials.
• Deploy network segmentation or disable unnecessary HTTP endpoints on devices.
• Monitor for PoC traffic and fast-track remediation if indicators appear.
• Plan a staged firmware upgrade and perform post-deployment validation; document change control and rollback procedures.