WAVLINK WN536AX6-A V260507 OpenVPN /protocol.csp strcpy openvpn_ip stack-based overflow

Summaryinfo

A vulnerability was found in WAVLINK WN536AX6-A V260507. It has been rated as very critical. This impacts the function strcpy of the file /protocol.csp of the component OpenVPN Handler. This manipulation of the argument openvpn_ip causes stack-based overflow. This vulnerability is registered as CVE-2026-120281. Remote exploitation of the attack is possible. Furthermore, an exploit is available. The vendor was contacted early about this disclosure.

Detailsinfo

A vulnerability classified as very critical was found in WAVLINK WN536AX6-A V260507. Affected by this vulnerability is the function strcpy of the file /protocol.csp of the component OpenVPN Handler. The manipulation of the argument openvpn_ip with an unknown input leads to a stack-based overflow vulnerability. The CWE definition for the vulnerability is CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). As an impact it is known to affect confidentiality, integrity, and availability.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-120281. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details and also a public exploit are known. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 11/01/2026).

It is possible to download the exploit at github.com. It is declared as proof-of-concept. The vendor was contacted early about this disclosure.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• WAVLINK

Name

• WN536AX6-A

Version

• V260507

License

• commercial

CPE 2.3info

• 🔒

CPE 2.2info

• 🔒

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Submitinfo

Accepted

• Submit #919790: Wavlink WN536AX6 V260507 CWE-121 (by yyjy)

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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