Is CVE-2026-120281 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-120281 being exploited in the wild.

How severe is CVE-2026-120281?

Critical severity, with a CVSS score of 10, published 2 November 2026.

How is CVE-2026-120281 attacked?

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

Am I affected by CVE-2026-120281?

Check whether you run Wavlink WN536AX6-A 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-2026-120281: WAVLINK WN536AX6-A stack buffer overflow in OpenVPN handler

CVE-2026-120281 · Severity: critical · CVSS 10 · Published 2026-11-02

The WAVLINK WN536AX6-A router contains a buffer overflow vulnerability in the OpenVPN configuration handler that can be exploited remotely without authentication. An attacker can crash the device's web interface permanently (denial of service) or execute arbitrary code with root privileges by sending a specially crafted network request. The vulnerability affects routers with default factory settings where passwordless login is enabled.

Technologies: Wavlink WN536AX6-A. Vendors: Wavlink.

Quick answers

Is CVE-2026-120281 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-120281 being exploited in the wild.
How severe is CVE-2026-120281?: Critical severity, with a CVSS score of 10, published 2 November 2026.
Which products and versions are affected?: Wavlink WN536AX6-A V260507.
Is there a fix for CVE-2026-120281?: No fixed version is recorded yet. Disable or restrict access to the /protocol.csp endpoint at the network level until a firmware patch is available. Disable the factory default passwordless login (FirstLogin=1) by setting a strong administrator password immediately after initial setup. 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-2026-120281 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-120281?: Check whether you run Wavlink WN536AX6-A 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.

How to fix

Disable or restrict access to the /protocol.csp endpoint at the network level until a firmware patch is available. Disable the factory default passwordless login (FirstLogin=1) by setting a strong administrator password immediately after initial setup.

Technical details

A stack-based buffer overflow exists in the /protocol.csp endpoint's openvpn_ser handler, where the openvpn_ip parameter is copied via unbounded strcpy() into a 16-byte buffer. The function lacks stack canary protection, and the return address is 264 bytes away, allowing an attacker to overwrite it by sending an openvpn_ip value of 264+ bytes. An unauthenticated attacker can obtain a session token via the factory default passwordless login mechanism and then trigger a crash or code execution with root privileges.

Affected products

WAVLINK WN536AX6-A V260507

Timeline

2026-11-02: disclosed
exploited: exploit code published publicly

References

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