TI-2026-83637 Aliases CVE-2026-120238 GHSA-g953-8239-77h5

OS command injection in WAVLINK WN553X1-B ovpn_file handler

HIGH 76CWE-77Published 2026-11-01 · Updated 2026-11-06

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-77.

Summary

WAVLINK WN553X1-B firmware 260403_2.0.0 contains an OS command injection flaw in the function sub_4162A8 of the file /bin/ioos, part of the ovpn_file handler. Improper neutralization of special elements in the file_id argument lets a remote attacker run operating system commands. The exploit has been publicly disclosed and may be used, and the vendor was contacted early about the disclosure.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Description from the CNA

A vulnerability 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. Such manipulation of the argument file_id leads to os command injection. The attack can be executed remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.01687 77th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by the CNA

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Wavlink	WN553X1-B	260403_2.0.0	—	No fix listed	CNA

WN553X1-B VendorWavlink Affected 260403_2.0.0 Fixed in — No fix listed CNA

CPE names CNA · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:wavlink:wn553x1-b::::::::	—	—	Wavlink

cpe:2.3:a:wavlink:wn553x1-b:*:*:*:*:*:*:*:* Versions — — ·Wavlink

Remediation

The sources list no fixed version for WAVLINK WN553X1-B.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Timeline

2026-11-01 Threatist record created from CVE-2026-120238
2026-11-01 Alias added: GHSA-g953-8239-77h5
2026-11-06 CISA SSVC decision points changed
2026-11-06 Priority changed: MEDIUM → HIGH

References

Exploit 1

https://github.com/senxitoyshuyi-ui/HACKALL/blob/main/WAVLINK%20WN553X1-B%20Router/WAVLINK_WN553X1-B_ovpn_file_command_injection.md

TI-2022-02298 WAVLINK WN535K2/WN535K3 nightled.cgi os command injection CVSS 3.1CRITICAL 9.8
TI-2026-83752 OS command injection in WAVLINK WN551X3-A DNS resolution handler CVSS 4.0CRITICAL 10.0
TI-2026-83751 WAVLINK WN551X3-A WireGuard CLI Group ioos os command injection CVSS 4.0CRITICAL 10.0
TI-2026-83668 Stack-based overflow in WAVLINK WN536AX6-A OpenVPN handler CVSS 4.0CRITICAL 10.0
TI-2026-83667 OS command injection in WAVLINK WN536AX6-A WireGuard handler CVSS 4.0CRITICAL 10.0
TI-2026-83666 OS command injection in WAVLINK WN536AX6-A openvpn_cli handler CVSS 4.0CRITICAL 10.0

See all 248 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences