Is CVE-2026-5689 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-5689 being exploited in the wild.

How severe is CVE-2026-5689?

High severity, with a CVSS score of 7.3, published 6 April 2026.

Which products and versions are affected?

TOTOLINK A7100ru 7.4cu.2313_b20191024.

Is there a fix for CVE-2026-5689?

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-2026-5689 attacked?

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

Am I affected by CVE-2026-5689?

Check whether you run TOTOLINK A7100ru 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-2026-5689: Totolink A7100RU command injection in setNtpCfg

CVE-2026-5689 · Severity: high · CVSS 7.3 · Published 2026-04-06

The Totolink A7100RU, a wireless router used for home and business networking, contains a security flaw in its web management interface. An attacker can exploit this vulnerability to take control of the device by sending a specially crafted network request. This could lead to unauthorized access to the network, interception of data, or a complete disruption of internet services.

Technologies: TOTOLINK A7100ru. Vendors: TOTOLINK.

Quick answers

Is CVE-2026-5689 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-5689 being exploited in the wild.
How severe is CVE-2026-5689?: High severity, with a CVSS score of 7.3, published 6 April 2026.
Which products and versions are affected?: TOTOLINK A7100ru 7.4cu.2313_b20191024.
Is there a fix for CVE-2026-5689?: 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-2026-5689 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-5689?: Check whether you run TOTOLINK A7100ru 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 A7100RU router firmware version 7.4cu.2313_b20191024. The flaw is located within the 'setNtpCfg' function of the '/cgi-bin/cstecgi.cgi' binary. Specifically, the 'tz' (timezone) parameter is passed to the 'Uci_Set_Str' function and subsequently processed by 'CsteSystem' using 'snprintf' without adequate sanitization. This allows a remote, unauthenticated attacker to inject shell commands (e.g., using backticks) that are eventually executed by 'execv()'. A public Proof of Concept (PoC) demonstrates that an attacker can trigger outbound network connections or execute arbitrary system commands via a crafted POST request.

Affected products

Totolink A7100RU 7.4cu.2313_b20191024

Timeline

2026-04-06: disclosed
2026-04-06: advisory

References

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