Is CVE-2026-9406 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-9406 being exploited in the wild.

How severe is CVE-2026-9406?

Critical severity, with a CVSS score of 9.8, published 25 May 2026.

Which products and versions are affected?

TOTOLINK A8000RU 7.1cu.643_b20200521.

Is there a fix for CVE-2026-9406?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-9406 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-9406?

Check whether you run TOTOLINK A8000RU at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-9406: Totolink A8000RU command injection in setRemoteCfg

CVE-2026-9406 · Severity: critical · CVSS 9.8 · Published 2026-05-25

The Totolink A8000RU router, a device used to provide wireless internet connectivity, contains a critical security flaw in its web management interface. An attacker can exploit this vulnerability to take complete control of the router by sending a specially crafted network request. This could allow an unauthorized user to intercept internet traffic, disrupt network services, or use the device as a foothold for further attacks on the local network.

Technologies: TOTOLINK A8000RU. Vendors: TOTOLINK.

Quick answers

Is CVE-2026-9406 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-9406 being exploited in the wild.
How severe is CVE-2026-9406?: Critical severity, with a CVSS score of 9.8, published 25 May 2026.
Which products and versions are affected?: TOTOLINK A8000RU 7.1cu.643_b20200521.
Is there a fix for CVE-2026-9406?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-9406 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-9406?: Check whether you run TOTOLINK A8000RU at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

An OS command injection vulnerability exists in the Totolink A8000RU router (firmware version 7.1cu.643_b20200521) within the 'setRemoteCfg' function of the '/cgi-bin/cstecgi.cgi' component. The vulnerability stems from improper neutralization of the 'enable' argument, which is passed to the 'Uci_Set_Str' function and eventually executed via 'execv()' in the 'CsteSystem' function. A remote, unauthenticated attacker can exploit this by sending a crafted POST request containing shell metacharacters (e.g., backticks) in the 'enable' parameter. Successful exploitation results in arbitrary command execution with the privileges of the web server. A public proof-of-concept (PoC) is available.

Affected products

Totolink A8000RU 7.1cu.643_b20200521

Timeline

2026-05-25: advisory: NVD published the vulnerability record.

References

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.