WAVLINK WN553X1-B 260403_2.0.0 ovpn_file /bin/ioos sub_4162A8 file_id os command injection

Summaryinfo

A vulnerability was found in WAVLINK WN553X1-B 260403_2.0.0. It has been rated as very critical. This vulnerability affects the function sub_4162A8 of the file /bin/ioos of the component ovpn_file Handler. Performing a manipulation of the argument file_id results in os command injection. This vulnerability is reported as CVE-2026-120238. The attack is possible to be carried out remotely. Moreover, an exploit is present. The vendor was contacted early about this disclosure.

Detailsinfo

A vulnerability classified as very critical has been found in WAVLINK WN553X1-B 260403_2.0.0. This affects the function sub_4162A8 of the file /bin/ioos of the component ovpn_file Handler. The manipulation of the argument file_id with an unknown input leads to a os command injection vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality, integrity, and availability.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-120238. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details and a public exploit are known. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 11/01/2026). MITRE ATT&CK project uses the attack technique T1202 for this issue.

The exploit is shared for download 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.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-114880). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

• WAVLINK

Name

• WN553X1-B

Version

• 260403_2.0.0

License

• commercial

CPE 2.3info

• 🔒

CPE 2.2info

• 🔒

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Submitinfo

Accepted

• Submit #919248: Wavlink Router Firmware V260403_2.0.0 Command Injection (by shuyi)

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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