Is CVE-2026-9405 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-9405 being exploited in the wild.

How severe is CVE-2026-9405?

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-2026-9405?

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-2026-9405 attacked?

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

Am I affected by CVE-2026-9405?

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-2026-9405: Totolink A8000RU command injection in setGameSpeedCfg

CVE-2026-9405 · Severity: critical · CVSS 9.8 · Published 2026-05-25

A critical security vulnerability exists in the Totolink A8000RU wireless router, a device used to provide internet connectivity and network management. An attacker can remotely take full control of the router by sending a specially crafted request to its web management interface. This could lead to the theft of sensitive data, interception of network traffic, or a complete shutdown of the device's operations.

Technologies: TOTOLINK A8000RU. Vendors: TOTOLINK.

Quick answers

Is CVE-2026-9405 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-9405 being exploited in the wild.
How severe is CVE-2026-9405?: 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-2026-9405?: 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-2026-9405 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-9405?: 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 flaw is located in the setGameSpeedCfg function, specifically within the sub_420CA8 routine, which fails to properly sanitize the 'enable' parameter. This user-provided value is passed to snprintf and subsequently executed via execv() through the CsteSystem function. A remote, unauthenticated attacker can exploit this by sending a crafted POST request containing shell metacharacters to achieve arbitrary code execution with system privileges. A public exploit (PoC) has been released.

Affected products

Totolink A8000RU 7.1cu.643_b20200521

Timeline

2026-05-25: advisory: NVD publication date

References

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