WAVLINK WN551X3-A M51X3_V251020-WO-182e965 DNS Resolution /bin/ioos sub_41a430 data os command injection

Summaryinfo

A vulnerability labeled as very critical has been found in WAVLINK WN551X3-A M51X3_V251020-WO-182e965. Affected is the function sub_41a430 of the file /bin/ioos of the component DNS Resolution Handler. Executing a manipulation of the argument data can lead to os command injection. This vulnerability is registered as CVE-2026-120345. It is possible to launch the attack remotely. Furthermore, an exploit is available. The vendor was contacted early about this disclosure.

Detailsinfo

A vulnerability classified as very critical was found in WAVLINK WN551X3-A M51X3_V251020-WO-182e965. This vulnerability affects the function sub_41a430 of the file /bin/ioos of the component DNS Resolution Handler. The manipulation of the argument data with an unknown input leads to a os command injection vulnerability. The CWE definition for the vulnerability is CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability.

The advisory is available at github.com. This vulnerability was named CVE-2026-120345. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details and also a public exploit are known. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 11/01/2026). This vulnerability is assigned to T1202 by the MITRE ATT&CK project.

It is possible to download the exploit at github.com. It is declared as proof-of-concept. The vendor was contacted early about this disclosure.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• WAVLINK

Name

• WN551X3-A

Version

• M51X3_V251020-WO-182e965

License

• commercial

CPE 2.3info

• 🔒

CPE 2.2info

• 🔒

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Accepted

• Submit #919579: Wavlink Router Firmware WN551X3-A-M51X3_V251020-WO Command Injection (by llsss)

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