Is CVE-2026-9388 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-9388 being exploited in the wild.

How severe is CVE-2026-9388?

Critical severity, with a CVSS score of 9.8, published 24 May 2026.

Which products and versions are affected?

TOTOLINK A8000RU 7.1cu.643_b20200521.

Is there a fix for CVE-2026-9388?

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-2026-9388 attacked?

It is attacked over the network, in device firmware.

Am I affected by CVE-2026-9388?

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-2026-9388: Totolink A8000RU command injection in setScheduleCfg

CVE-2026-9388 · Severity: critical · CVSS 9.8 · Published 2026-05-24

A vulnerability exists in the Totolink A8000RU wireless router, a device used to provide internet connectivity and manage local networks. 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 interception of network traffic, unauthorized access to connected devices, or a complete disruption of internet services.

Technologies: TOTOLINK A8000RU. Vendors: TOTOLINK.

Quick answers

Is CVE-2026-9388 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-9388 being exploited in the wild.
How severe is CVE-2026-9388?: Critical severity, with a CVSS score of 9.8, published 24 May 2026.
Which products and versions are affected?: TOTOLINK A8000RU 7.1cu.643_b20200521.
Is there a fix for CVE-2026-9388?: 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-2026-9388 attacked?: It is attacked over the network, in device firmware.
Am I affected by CVE-2026-9388?: 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 within the /cgi-bin/cstecgi.cgi component. The root cause is the improper neutralization of the 'mode' argument in the setScheduleCfg function (sub_4264F0). The user-provided 'mode' value is passed to snprintf and subsequently executed via execv() through the CsteSystem function without adequate sanitization. A remote, unauthenticated attacker can exploit this by sending a crafted POST request to execute arbitrary system commands with root privileges. A public exploit (PoC) demonstrating the creation of files via command injection is available.

Affected products

Totolink A8000RU 7.1cu.643_b20200521

Timeline

2026-05-24: disclosed: Initial disclosure and CVE assignment
2026-05-24: advisory: NVD publication date

References

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