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Vulnerability record · CVE-2026-11834 · published 22 June 2026

CVE-2026-11834: OS command injection vulnerability

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.

8.7 CVSS 4.0 High EPSS 0.66% · top 50.2% CWE-78 · OS command injection Awaiting Analysis
8.7CVSS 4.0 base score
0.66%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
8References
26 Jun 2026Last modified by NVD

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.

CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://mattg.systems/posts/cve-2026-11834/
https://www.tp-link.com/en/support/download/archer-c20/
https://www.tp-link.com/en/support/download/archer-mr200/#Firmware
https://www.tp-link.com/en/support/download/archer-mr402/#Firmware
https://www.tp-link.com/en/support/download/archer-vr2100/#Firmware
https://www.tp-link.com/en/support/download/tl-mr6400/v7/#Firmware
https://www.tp-link.com/us/support/download/archer-c20/
https://www.tp-link.com/us/support/faq/5141/

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Source: NIST National Vulnerability Database (record CVE-2026-11834), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.