# CVE-2026-120345: WAVLINK WN551X3-A DNS Resolution ioos sub_41a430 os command injection

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

A vulnerability was found in WAVLINK WN551X3-A M51X3_V251020-WO-182e965. This impacts the function sub_41a430 of the file /bin/ioos of the component DNS Resolution Handler. Performing a manipulation of the argument data results in os command injection. It is possible to initiate the attack 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 / WN551X3-A: M51X3_V251020-WO-182e965 (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-78, CWE-77

## Exploit evidence

- exploit: https://github.com/senxitoyshuyi-ui/HACKALL/blob/main/WAVLINK_WN551X3-A%20Router/WAVLINK_WN551X3-A_dns_resolution_command_injection.md (CNA: VulDB)

## References

- https://vuldb.com/vuln/429670 (CNA: VulDB; vdb-entry, technical-description)

- https://vuldb.com/vuln/429670/cti (CNA: VulDB; signature, permissions-required)

- https://vuldb.com/cve/CVE-2026-120345 (CNA: VulDB; third-party-advisory)

- https://vuldb.com/submit/919579 (CNA: VulDB; third-party-advisory)

- https://github.com/senxitoyshuyi-ui/HACKALL/blob/main/WAVLINK_WN551X3-A%20Router/WAVLINK_WN551X3-A_dns_resolution_command_injection.md (CNA: VulDB; exploit)

## Provenance

- CNA: VulDB: https://www.cve.org/CVERecord?id=CVE-2026-120345; retrieved 2026-11-02; source updated 2026-11-02

Revision: 76a125b1134aa088468fc175037cfd27fd623b937c57f6b9caaf59139774b09a

Canonical: https://y2.dev/cve/CVE-2026-120345