Is CVE-2026-9456 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-9456 being exploited in the wild.

How severe is CVE-2026-9456?

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-2026-9456?

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-2026-9456 attacked?

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

Am I affected by CVE-2026-9456?

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-2026-9456: Totolink A8000RU command injection in setOpenVpnCfg

CVE-2026-9456 · 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 networking for homes and small offices. 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 local network.

Technologies: TOTOLINK A8000RU. Vendors: TOTOLINK.

Quick answers

Is CVE-2026-9456 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-9456 being exploited in the wild.
How severe is CVE-2026-9456?: 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-2026-9456?: 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-2026-9456 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-9456?: 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 setOpenVpnCfg function (specifically sub_430C78), which fails to properly sanitize the 'port' and 'enabled' parameters before passing them to the CsteSystem function. The CsteSystem function eventually executes the input via execv(). A remote, unauthenticated attacker can exploit this by sending a crafted POST request containing shell metacharacters (e.g., backticks) to execute arbitrary system commands. A public proof-of-concept demonstrating the creation of files on the filesystem is available.

Affected products

Totolink A8000RU 7.1cu.643_b20200521

Timeline

2026-05-25: disclosed: Vulnerability reported via VulDB and NVD
2026-05-25: advisory

References

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