---
id: "CVE-2026-120239"
kind: "vulnerability"
aliases: ["CVE-2026-120239"]
title: "WAVLINK WN553X1-B router: remote command injection via WireGuard handler"
severity: "critical"
cvss: 9.9
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: [{"name": "WN553X1-B", "fixed": [], "affected": "V260403_2.0.0", "ecosystem": "vendor"}]
ecosystems: []
tags: ["firmware", "infrastructure", "poc-public", "router", "wavlink", "wireguard", "wn553x1-b"]
not_affected_if: ["other-firmware-versions"]
published_at: "2026-11-01T18:17:13+00:00"
first_seen_at: "2026-11-01T18:21:31+00:00"
updated_at: "2026-11-01T18:24:20+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-120239", "first_seen_at": "2026-11-01T18:21:31+00:00"}, {"source": "analyst", "url": null, "first_seen_at": "2026-11-01T18:24:20+00:00"}]
---

# WAVLINK WN553X1-B router: remote command injection via WireGuard handler

The WAVLINK WN553X1-B router firmware (V260403_2.0.0) has an OS command injection in its WireGuard CLI handler, reached through the file_id argument. A remote attacker can run operating system commands on the device.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:WN553X1-B affected V260403_2.0.0 fixed ?

## How to check

Check the firmware version on the router admin page; V260403_2.0.0 is the only version named as affected. Other versions are not stated to be safe or affected. Also check whether the admin interface is reachable from the internet or untrusted networks.

## Timeline

- 2026-11-01T18:21:31+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-120239
- 2026-11-01T18:24:20+00:00 analyst — Read VulDB VDB-429598 (CNA) and WAVLINK advisory index. Vendor has no entry/fix for this CVE; VulDB says no mitigation known; public PoC on github (link not shown, locked). Auth: CVSS vector PR:L so a low-privileged login is likely needed (not stated in text); whether WireGuard must be enabled is not stated. Nothing verified: no vendor statement.

## Documents

- [advisory] VDB-429598 WAVLINK WN553X1-B WireGuard CLI file_id command injection https://vuldb.com/vuln/429598
- [mentions] WAVLINK Security Advisory index (no WN553X1-B entry) https://docs.wavlink.xyz/Security_Advisory/

## From the sources

A vulnerability was found in WAVLINK WN553X1-B V260403_2.0.0. This vulnerability affects the function sub_419DA8 of the file /bin/ioos of the component WireGuard CLI Handler. Performing a manipulation of the argument file_id results in os command injection. The attack is possible to be carried out remotely. The exploit has been made public and could be used. The vendor was contacted early about this disclosure.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_