CVE-2026-11834
Description
A command injection vulnerability has been identified in the DHCP option processing logic in multiple TP-Link router models, due to insufficient validation of externally supplied DHCP option data. An adjacent attacker may exploit this vulnerability by supplying crafted DHCP responses, potentially resulting in unauthorized command execution during device initialization or provisioning workflows. This typically occurs when the device is in a factory-default or unconfigured state. Successful exploitation may allow an adjacent, unauthenticated attacker to execute arbitrary commands with elevated privileges, potentially leading to full compromise of the affected device and unauthorized administrative control.
How to fix
- TP-Link Systems Inc. Archer MR200 v071.3.0 Build 250605 or later
- TP-Link Systems Inc. Archer MR200 v81.5.0 Build 260605 or later
- TP Link Systems Inc. Archer MR402 v11.5.0 Build 260605 or later
- TP-Link Systems Inc. Archer VR2100 v1EU_V1_260330 or later
- TP-Link Systems Inc. Archer C20 v5EU_V5_260317, US_V5_260419 or later
- TP-Link Systems Inc. Archer C20 v6V6_260608 or later
- TP-Link Systems Inc. TL-MR6400 v71.7.0 Build 260413 or later
- tp-link.com/en/support/download/archer-c20/
- tp-link.com/en/support/download/archer-mr402/#Firmware
- tp-link.com/en/support/download/archer-mr200/#Firmware
- tp-link.com/en/support/download/tl-mr6400/v7/#Firmware
- tp-link.com/en/support/download/archer-vr2100/#Firmware
- tp-link.com/us/support/download/archer-c20/
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| TP-Link Systems Inc. Archer MR200 v07 | v < 1.3.0 Build 250605 | 1.3.0 Build 250605 |
| TP-Link Systems Inc. Archer MR200 v8 | v < 1.5.0 Build 260605 | 1.5.0 Build 260605 |
| TP Link Systems Inc. Archer MR402 v1 | v < 1.5.0 Build 260605 | 1.5.0 Build 260605 |
| TP-Link Systems Inc. Archer VR2100 v1 | v < EU_V1_260330 | EU_V1_260330 |
| TP-Link Systems Inc. Archer C20 v5 | v < EU_V5_260317, v < US_V5_260419 | EU_V5_260317, US_V5_260419 |
| TP-Link Systems Inc. Archer C20 v6 | v < V6_260608 | V6_260608 |
| TP-Link Systems Inc. TL-MR6400 v7 | v < 1.7.0 Build 260413 | 1.7.0 Build 260413 |
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