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

Quick assessment

Affected

WAVLINK WN551X3-A

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 WAVLINK WN551X3-A 设备（固件版本 M51X3_V251020-WO-182e965）中发现一处漏洞。该漏洞影响组件"DNS 解析处理器”中文件内的函数。通过操纵该函数的参数数据，可导致操作系统命令注入。攻击者可远程发起此类攻击。该漏洞的利用方法已公开，可能被恶意利用。厂商已就此次披露事宜在早期阶段收到通知。

CVSS 10.0 · Critical Updated Nov 02, 2026

Possible ATT&CK Techniques 3 AI

T1059.004 · Unix Shell T1059 · Command and Scripting Interpreter T1190 · Exploit Public-Facing Application

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Vulnerability Information

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Vulnerability Title

WAVLINK WN551X3-A DNS Resolution ioos sub_41a430 os command injection

Source: CVE Program / CVE List V5

Vulnerability Description

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.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Source: CVE Program / CVE List V5

Vulnerability Type

OS命令中使用的特殊元素转义处理不恰当(OS命令注入)

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
WAVLINK	WN551X3-A	M51X3_V251020-WO-182e965	`cpe:2.3:a:wavlink:wn551x3-a::::::::`

II. Public POCs for CVE-2026-120345

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-120345

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Vendor Advisories for CVE-2026-120345 (1)

CVE-2026-120345 | WAVLINK WN551X3-A M51X3_V251020-WO-182e965 DNS Resolution /bin/ioos sub_41a430 data os command injection vdb-entry technical-description

Other References for CVE-2026-120345 (4)

https://github.com/senxitoyshuyi-ui/HACKALL/blob/main/WAVLINK_WN551X3-A%20Router/WAVLINK_WN551X3-A_dns_resolution_command_injection.md exploit
https://vuldb.com/cve/CVE-2026-120345 third-party-advisory
https://vuldb.com/vuln/429670/cti signature permissions-required
https://vuldb.com/submit/919579 third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-120345

Same Patch Batch · WAVLINK · 2026-11-02 · 6 CVEs total

CVE-2026-120279	10.0 CRITICAL	WAVLINK WN536AX6-A openvpn_cli protocol.csp os command injection
CVE-2026-120280	10.0 CRITICAL	WAVLINK WN536AX6-A WireGuard protocol.csp wireguard_cli_group handler os command injection
CVE-2026-120281	10.0 CRITICAL	WAVLINK WN536AX6-A OpenVPN protocol.csp strcpy stack-based overflow
CVE-2026-120344	10.0 CRITICAL	WAVLINK WN551X3-A WireGuard CLI Group ioos system os command injection
CVE-2026-120282	9.9 CRITICAL	WAVLINK WN536AX6-A protocol.csp host_black os command injection

IV. Related Vulnerabilities

Same product: WN551X3-A

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

Same vendor: WAVLINK

Same weakness: CWE-78