Is CVE-2026-5679 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-5679 being exploited in the wild.

How severe is CVE-2026-5679?

Medium severity, with a CVSS score of 5.5, published 6 April 2026.

Which products and versions are affected?

TOTOLINK A3300R 17.0.0cu.557_B20221024.

Is there a fix for CVE-2026-5679?

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-2026-5679 attacked?

It is attacked from the adjacent network, in a network appliance.

Am I affected by CVE-2026-5679?

Check whether you run TOTOLINK A3300R 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-2026-5679: Totolink A3300R OS command injection in vsetTr069Cfg

CVE-2026-5679 · Severity: medium · CVSS 5.5 · Published 2026-04-06

A security vulnerability exists in the Totolink A3300R wireless router, a device used to provide internet connectivity in homes and small offices. An attacker with access to the local network can take control of the device by sending a specially crafted request to its management interface. This could allow an unauthorized user to disrupt internet service, intercept network traffic, or use the router as a foothold for further attacks on the internal network.

Technologies: TOTOLINK A3300R. Vendors: TOTOLINK.

Quick answers

Is CVE-2026-5679 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-5679 being exploited in the wild.
How severe is CVE-2026-5679?: Medium severity, with a CVSS score of 5.5, published 6 April 2026.
Which products and versions are affected?: TOTOLINK A3300R 17.0.0cu.557_B20221024.
Is there a fix for CVE-2026-5679?: 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-2026-5679 attacked?: It is attacked from the adjacent network, in a network appliance.
Am I affected by CVE-2026-5679?: Check whether you run TOTOLINK A3300R 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 A3300R router firmware version 17.0.0cu.557_B20221024. The flaw is located within the vsetTr069Cfg function in /cgi-bin/cstecgi.cgi, where the application fails to properly sanitize the 'stun_pass' argument before passing it to a system execution function. Specifically, the sub_4100F0 function retrieves the stun_pass value and uses sprintf to concatenate it into a command string that is eventually executed via execv through the CsteSystem wrapper. An authenticated attacker with adjacent network access can exploit this by sending a crafted POST request containing shell metacharacters (e.g., $(command)) to achieve arbitrary code execution on the underlying Linux operating system. Public exploit code (PoC) has been disclosed.

Affected products

Totolink A3300R 17.0.0cu.557_B20221024

Timeline

2026-04-06: disclosed: Vulnerability disclosed via VulDB and GitHub PoC
2026-04-06: advisory: NVD published the CVE record

References

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