CVE Alert: CVE-2025-12619 – Tenda – A15

Risk verdict

High risk: remote code execution with a publicly available exploit; elevated urgency for devices exposed to untrusted networks or the internet.

Why this matters

Affects consumer-grade Tenda A15 gateways, enabling an attacker to run arbitrary code with high impact on confidentiality, integrity, and availability. If weaponised, compromise could lead to device takeover, traffic manipulation, credential exposure, or network-wide persistence in affected homes or small offices.

Most likely attack path

An attacker can exploit over the network without user interaction, leveraging a low-privilege context to trigger a buffer overflow in openNetworkGateway via crafted input to wpapsk_crypto2_4g. Successful exploitation yields control of the gateway process and potential full device compromise; lateral movement is contained to the gateway but may enable traffic interception or pivot to connected hosts within the LAN.

Who is most exposed

Consumers and small offices using Tenda A15 in typical home or small business deployments, especially where WAN management interfaces are reachable from the internet or poorly isolated from the LAN.

Detection ideas

• Unusual or repeated HTTP requests to /goform/openNetworkGateway with crafted wpapsk_crypto2_4g values.
• Gateway process crashes or memory corruption logs; abnormal memory/CPU spikes on the device.
• Crash dumps or stack traces pointing to openNetworkGateway.
• Unauthorised firmware reboots or resilience checks failing post-request.

Mitigation and prioritisation

• Patch: update to the vendor’s fixed firmware version as soon as available; verify release notes for CVE remediation.
• Disable or restrict remote management; segment WAN/admin access from the LAN; apply strict access controls.
• Apply network access controls to limit exposure of the gateway admin interface (firewall, ACLs, VPN-only admin).
• Implement change-management: schedule firmware upgrade windows; backup configurations; monitor for post-update instability.
• If patching is delayed, implement compensating controls and heightened monitoring; treat as priority 2–1 depending on exposure level.