# CVE-2026-120281: WAVLINK WN536AX6-A OpenVPN protocol.csp strcpy stack-based overflow

Status: published. Published: 2026-11-02. Updated: 2026-11-02.

A vulnerability was found in WAVLINK WN536AX6-A V260507. This affects the function strcpy of the file /protocol.csp of the component OpenVPN Handler. The manipulation of the argument openvpn_ip results in stack-based buffer overflow. The attack may be launched remotely. The exploit has been made public and could be used. The vendor was contacted early about this disclosure.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- WAVLINK / WN536AX6-A: V260507 (affected). Source: CNA: VulDB

## Severity and prioritization

- CVSS 4.0: 10 (critical); CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P; source: CNA: VulDB

- CVSS 3.1: 10 (critical); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:R; source: CNA: VulDB

- CVSS 3.0: 10 (critical); CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:R; source: CNA: VulDB

- CVSS 2.0: 10 (critical); AV:N/AC:L/Au:N/C:C/I:C/A:C/E:POC/RL:ND/RC:UR; source: CNA: VulDB

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-121, CWE-119

## Exploit evidence

- exploit: https://github.com/F-yyjy/cve/blob/main/WN536AX6-A_openvpn_ip.md (CNA: VulDB)

## References

- https://vuldb.com/vuln/429625 (CNA: VulDB; vdb-entry, technical-description)

- https://vuldb.com/vuln/429625/cti (CNA: VulDB; signature, permissions-required)

- https://vuldb.com/cve/CVE-2026-120281 (CNA: VulDB; third-party-advisory)

- https://vuldb.com/submit/919790 (CNA: VulDB; third-party-advisory)

- https://github.com/F-yyjy/cve/blob/main/WN536AX6-A_openvpn_ip.md (CNA: VulDB; exploit)

## Provenance

- CNA: VulDB: https://www.cve.org/CVERecord?id=CVE-2026-120281; retrieved 2026-11-02; source updated 2026-11-02

Revision: 13a8a9dea013a7d073d70e21e8268297d030aaca9f7c2b7d3aceb5654d43ddf3

Canonical: https://y2.dev/cve/CVE-2026-120281