Is CVE-2026-120231 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-120231 being exploited in the wild.

How severe is CVE-2026-120231?

Critical severity, with a CVSS score of 9.9, published 1 November 2026.

Which products and versions are affected?

Wavlink WN553X1-B V260403_2.0.0.

Is there a fix for CVE-2026-120231?

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-2026-120231 attacked?

It is attacked over the network, in device firmware.

Am I affected by CVE-2026-120231?

Check whether you run Wavlink WN553X1-B 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-2026-120231: WAVLINK WN553X1-B OS command injection in OpenVPN CLI handler

CVE-2026-120231 · Severity: critical · CVSS 9.9 · Published 2026-11-01

The WAVLINK WN553X1-B is a home router with an OpenVPN client feature. An authenticated attacker can inject arbitrary operating system commands through the router's web interface that execute with root privileges, gaining complete control of the device. Since the router ships with a default password that is rarely changed, this vulnerability is effectively accessible to anyone on the network.

Technologies: Wavlink WN553X1-B. Vendors: Wavlink.

Quick answers

Is CVE-2026-120231 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-120231 being exploited in the wild.
How severe is CVE-2026-120231?: Critical severity, with a CVSS score of 9.9, published 1 November 2026.
Which products and versions are affected?: Wavlink WN553X1-B V260403_2.0.0.
Is there a fix for CVE-2026-120231?: 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-2026-120231 attacked?: It is attacked over the network, in device firmware.
Am I affected by CVE-2026-120231?: Check whether you run Wavlink WN553X1-B 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 authenticated command injection vulnerability exists in the /bin/ioos binary (OpenVPN CLI handler), specifically in function sub_416568, where the user-supplied file_id parameter is passed unsanitized to snprintf and subsequently popen. The application only checks for spaces via strchr, allowing an attacker to break out of double-quoted context and inject OS commands. Exploitation requires a valid session token (obtainable via default credentials), and commands execute as root.

Affected products

WAVLINK WN553X1-B V260403_2.0.0

Timeline

2026-11-01: disclosed: Publicly disclosed
2026-11-01: advisory

References

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