Is CVE-2026-5677 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-5677 being exploited in the wild.

How severe is CVE-2026-5677?

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-2026-5677?

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-2026-5677 attacked?

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

Am I affected by CVE-2026-5677?

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-2026-5677: Totolink A7100RU command injection in cstecgi.cgi

CVE-2026-5677 · Severity: high · CVSS 7.3 · Published 2026-04-06

A security vulnerability exists in the Totolink A7100RU wireless router, a device used to provide internet connectivity in homes and small offices. An attacker can remotely send a specially crafted request to the router to take control of the device. This could allow an unauthorized user to intercept network traffic, disrupt internet service, or use the router as a foothold to attack other devices on the local network.

Technologies: TOTOLINK A7100ru. Vendors: TOTOLINK.

Quick answers

Is CVE-2026-5677 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-5677 being exploited in the wild.
How severe is CVE-2026-5677?: 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-2026-5677?: 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-2026-5677 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-5677?: 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 CsteSystem function in the /cgi-bin/cstecgi.cgi binary. The application fails to properly sanitize the 'resetFlags' parameter before passing it to a snprintf call, which is subsequently executed via execv(). A remote, unauthenticated attacker can exploit this by sending a crafted POST request containing shell metacharacters (e.g., backticks) to execute arbitrary commands with the privileges of the web server. A public proof-of-concept (PoC) demonstrating the use of wget for command execution has been released.

Affected products

Totolink A7100RU 7.4cu.2313_b20191024

Timeline

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

References

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