Is CVE-2026-9477 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-9477 being exploited in the wild.

How severe is CVE-2026-9477?

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-2026-9477?

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-2026-9477 attacked?

It is attacked over the network, in device firmware.

Am I affected by CVE-2026-9477?

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-2026-9477: Totolink A8000RU command injection in setAccessDeviceCfg

CVE-2026-9477 · 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 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 unauthorized access to network traffic, service disruptions, or the use of the device as a foothold for further attacks on the internal network.

Technologies: TOTOLINK A8000RU. Vendors: TOTOLINK.

Quick answers

Is CVE-2026-9477 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-9477 being exploited in the wild.
How severe is CVE-2026-9477?: 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-2026-9477?: 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-2026-9477 attacked?: It is attacked over the network, in device firmware.
Am I affected by CVE-2026-9477?: 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 setAccessDeviceCfg function, where the 'mac' parameter is improperly sanitized before being processed. Specifically, the user-provided input is concatenated into a buffer and eventually passed to the execv() function via the CsteSystem utility. A remote, unauthenticated attacker can exploit this by sending a crafted POST request containing shell metacharacters (e.g., backticks) in the 'mac' argument to execute arbitrary commands with elevated privileges. Public exploit code (PoC) has been released.

Affected products

Totolink A8000RU 7.1cu.643_b20200521

Timeline

2026-05-25: disclosed: Initial public disclosure of the vulnerability and PoC.
2026-05-25: advisory: NVD and VulDB published the advisory.

References

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