TI-2026-83752 Aliases CVE-2026-120345 GHSA-5m3x-rp28-cf8g

OS command injection in WAVLINK WN551X3-A DNS resolution handler

HIGH 82CWE-77Published 2026-11-02 · Updated 2026-11-05

Key facts

Attack vector: Network
Privileges required: None
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 WN551X3-A firmware M51X3_V251020-WO-182e965 has an OS command injection flaw in the function sub_41a430 of /bin/ioos, in the DNS Resolution Handler component. The code does not neutralize special elements in the data argument (CWE-78), which lets an unauthenticated remote attacker run operating system commands with high impact to confidentiality, integrity and availability. A public exploit is linked in the references.

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

Description from the CNA

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.01989 80th 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: Yes
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	WN551X3-A	M51X3_V251020-WO-182e965	—	No fix listed	CNA

WN551X3-A VendorWavlink Affected M51X3_V251020-WO-182e965 Fixed in — No fix listed CNA

CPE names CNA · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:wavlink:wn551x3-a::::::::	—	—	Wavlink

cpe:2.3:a:wavlink:wn551x3-a:*:*:*:*:*:*:*:* Versions — — ·Wavlink

Remediation

The sources list no fixed version for WAVLINK WN551X3-A.

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

Timeline

2026-11-02 Threatist record created from CVE-2026-120345
2026-11-02 Alias added: GHSA-5m3x-rp28-cf8g
2026-11-05 CISA SSVC decision points changed
2026-11-05 Priority changed: MEDIUM → HIGH

References

Exploit 1

https://github.com/senxitoyshuyi-ui/HACKALL/blob/main/WAVLINK_WN551X3-A%20Router/WAVLINK_WN551X3-A_dns_resolution_command_injection.md

TI-2022-02298 WAVLINK WN535K2/WN535K3 nightled.cgi os command injection CVSS 3.1CRITICAL 9.8
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
TI-2026-83664 WAVLINK WN536AX6-A WireGuard CLI Group ioos sub_41a1d8 OS command injection 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