CVE-2026-9436: Totolink A8000RU Web Management cstecgi.cgi setL2tpServerCfg os command injection

Published May 25, 2026

Updated

A flaw has been found in Totolink A8000RU 7.1cu.643_b20200521. The impacted element is the function setL2tpServerCfg of the file /cgi-bin/cstecgi.cgi of the component Web Management Interface. Executing a manipulation of the argument enable can lead to os command injection. The attack can be executed remotely. The exploit has been published and may be used.

Affected Software

1 affected component

TOTOLINK Totolink A8000RU=7.1cu.643_b20200521

Event History

May 25, 2026

CVE Published

via MITRE·07:00 AM

Data Sourced

via MITRE·07:00 AM

DescriptionSeverityWeakness

Frequently Asked Questions

What is the severity of CVE-2026-9436?

CVE-2026-9436 has a critical severity rating of 9.8.

How do I fix CVE-2026-9436?

To mitigate CVE-2026-9436, update the Totolink A8000RU device to the latest firmware version provided by the vendor.

What type of vulnerability is CVE-2026-9436?

CVE-2026-9436 is classified as an OS command injection vulnerability.

Who is affected by CVE-2026-9436?

Users of the Totolink A8000RU model with firmware version 7.1cu.643_b20200521 are affected by CVE-2026-9436.

What can an attacker do with CVE-2026-9436?

An attacker exploiting CVE-2026-9436 can execute arbitrary operating system commands on the affected device.

Company

Resources

Contact

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