Vulnerability · Published Nov 2, 2026 · Assigned by VulDB

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

Critical 10.0

In plain English

A critical-severity OS command injection in WN551X3-A from WAVLINK. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 2.0% (higher than 81% of all known vulnerabilities).

Severity (CVSS 3.1)10.0Critical

Exploit odds (30 days)2.0%top 19.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
WAVLINK	WN551X3-A	M51X3_V251020-WO-182e965

Weakness: CWE-78, CWE-77 · Vector: 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

References

VDB-429670 | WAVLINK WN551X3-A DNS Resolution ioos sub_41a430 os command injection vdb-entry, technical-description
VDB-429670 | CTI Indicators (IOB, IOC, TTP, IOA) signature, permissions-required
CVE-2026-120345 | CVE Analysis and Report third-party-advisory
Submit #919579 | Wavlink Router Firmware WN551X3-A-M51X3_V251020-WO Command Injection third-party-advisory
https://github.com/senxitoyshuyi-ui/HACKALL/blob/main/WAVLINK_WN551X3-A%20Router/WAVLINK_WN551X3-A_dns_resolution_command_injection.md exploit