Vulnerability · Published Nov 2, 2026 · Assigned by VulDB

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

Critical 10.0

In plain English

A critical-severity stack buffer overflow in WN536AX6-A from WAVLINK. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 48% of all known vulnerabilities).

Severity (CVSS 3.1)10.0Critical

Exploit odds (30 days)0.6%top 51.9% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
WAVLINK	WN536AX6-A	V260507

Weakness: CWE-121, CWE-119 · Vector: 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

References

VDB-429625 | WAVLINK WN536AX6-A OpenVPN protocol.csp strcpy stack-based overflow vdb-entry, technical-description
VDB-429625 | CTI Indicators (IOB, IOC, IOA) signature, permissions-required
CVE-2026-120281 | CVE Analysis and Report third-party-advisory
Submit #919790 | Wavlink WN536AX6 V260507 CWE-121 third-party-advisory
https://github.com/F-yyjy/cve/blob/main/WN536AX6-A_openvpn_ip.md exploit