Is CVE-2026-7203 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-7203 being exploited in the wild.

How severe is CVE-2026-7203?

Critical severity, with a CVSS score of 9.8, published 28 April 2026.

Which products and versions are affected?

TOTOLINK A8000RU 7.1cu.643_b20200521.

Is there a fix for CVE-2026-7203?

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-2026-7203 attacked?

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

Am I affected by CVE-2026-7203?

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-2026-7203: Totolink A8000RU command injection in setUrlFilterRules

CVE-2026-7203 · Severity: critical · CVSS 9.8 · Published 2026-04-28

The Totolink A8000RU router, a device used for home and business networking, contains a critical security flaw in its web management interface. An attacker can exploit this vulnerability to take complete control of the router by sending a specially crafted network request. This could lead to the interception of internet traffic, unauthorized access to the local network, or a total disruption of internet services.

Technologies: TOTOLINK A8000RU. Vendors: TOTOLINK.

Quick answers

Is CVE-2026-7203 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-7203 being exploited in the wild.
How severe is CVE-2026-7203?: Critical severity, with a CVSS score of 9.8, published 28 April 2026.
Which products and versions are affected?: TOTOLINK A8000RU 7.1cu.643_b20200521.
Is there a fix for CVE-2026-7203?: 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-2026-7203 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-7203?: 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 'setUrlFilterRules' function within the '/cgi-bin/cstecgi.cgi' component of the Totolink A8000RU router (firmware version 7.1cu.643_b20200521). The root cause is the improper neutralization of the 'enable' argument, which is passed to the 'Uci_Set_Str' function 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 (e.g., backticks) in the JSON payload. Successful exploitation grants the attacker full shell access to the underlying operating system. A public Proof of Concept (PoC) is available.

Affected products

Totolink A8000RU 7.1cu.643_b20200521

Timeline

2026-04-28: disclosed
2026-04-28: advisory

References

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