CVE-2026-120345

WAVLINK WN551X3-A DNS Resolution ioos sub_41a430 os command injection

Critical 10.0
A public exploit reference is listed

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.

Key facts

Published: 2 Nov 2026
Last changed: 5 Nov 2026
Assigned by: VulDB
EPSS: 1.989% likely to be exploited in the next 30 days, higher than 80.968% of CVEs (scores for 15 Nov 2026)
SSVC (CISA): Exploitation: poc; Automatable: yes; Technical impact: total

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

10.0CVSS 4.0, Criticalfrom the CNA (VulDB)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
10.0CVSS 3.1, Criticalfrom the CNA (VulDB)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
10.0CVSS 3.0, Criticalfrom the CNA (VulDB)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
10.0CVSS 2.0, Highfrom the CNA (VulDB)AV:N/AC:L/Au:N/C:C/I:C/A:C/E:POC/RL:ND/RC:UR

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

No explicit remediation statement is available on this page yet. Consult the original record and vendor references before choosing a fix.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

Vendor	Product	Versions
WAVLINK	WN551X3-A	M51X3_V251020-WO-182e965 (affected)

Timeline

1 Nov 2026 Advisory disclosed
1 Nov 2026 VulDB entry created
1 Nov 2026 VulDB entry last update
2 Nov 2026 Published

Weakness

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References

VDB-429670 | WAVLINK WN551X3-A DNS Resolution ioos sub_41a430 os command injectionvdb-entrytechnical-description
VDB-429670 | CTI Indicators (IOB, IOC, TTP, IOA)signaturepermissions-required
CVE-2026-120345 | CVE Analysis and Reportthird-party-advisory
Submit #919579 | Wavlink Router Firmware WN551X3-A-M51X3_V251020-WO Command Injectionthird-party-advisory
github.comexploit