Is CVE-2026-9408 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-9408 being exploited in the wild.

How severe is CVE-2026-9408?

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-2026-9408?

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-2026-9408 attacked?

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

Am I affected by CVE-2026-9408?

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-2026-9408: Totolink A8000RU command injection in setStaticDhcpRules

CVE-2026-9408 · Severity: critical · CVSS 9.8 · Published 2026-05-25

A vulnerability exists in the Totolink A8000RU wireless router, a device used to provide internet connectivity and manage local networks. An attacker can exploit this flaw to take complete control of the router by sending a specially crafted request to its web management interface. This could lead to the interception of network traffic, unauthorized access to connected devices, or a total disruption of internet services.

Technologies: TOTOLINK A8000RU. Vendors: TOTOLINK.

Quick answers

Is CVE-2026-9408 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-9408 being exploited in the wild.
How severe is CVE-2026-9408?: 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-2026-9408?: 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-2026-9408 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-9408?: 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 /cgi-bin/cstecgi.cgi component. The vulnerability is located in the setStaticDhcpRules function, specifically due to improper neutralization of the 'enable' argument. The application uses snprintf to incorporate this user-supplied parameter into a system command string, which is subsequently executed via execv() through the CsteSystem function. A remote, unauthenticated attacker can exploit this by sending a crafted POST request containing shell metacharacters (e.g., backticks) to execute arbitrary commands with the privileges of the web server. A public exploit (PoC) demonstrating file creation via the 'ls' command has been disclosed.

Affected products

Totolink A8000RU 7.1cu.643_b20200521

Timeline

2026-05-25: advisory: NVD publication date
2026-05-24: disclosed: Initial disclosure by VulDB and public PoC release

References

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