Vulnerability · Published Nov 1, 2026 · Assigned by VulDB

CVE-2026-120239WAVLINK WN553X1-B WireGuard CLI ioos sub_419DA8 os command injection

Critical 9.9

In plain English

A critical-severity OS command injection in WN553X1-B from WAVLINK. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 1.7% (higher than 77% of all known vulnerabilities).

Severity (CVSS 3.1)9.9Critical

Exploit odds (30 days)1.7%top 22.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

A vulnerability was found in WAVLINK WN553X1-B V260403_2.0.0. This vulnerability affects the function sub_419DA8 of the file /bin/ioos of the component WireGuard CLI Handler. Performing a manipulation of the argument file_id results in os command injection. The attack is possible to be carried out 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	WN553X1-B	V260403_2.0.0

Weakness: CWE-78, CWE-77 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:R

References

VDB-429598 | WAVLINK WN553X1-B WireGuard CLI ioos sub_419DA8 os command injection vdb-entry, technical-description
VDB-429598 | CTI Indicators (IOB, IOC, TTP, IOA) signature, permissions-required
CVE-2026-120239 | CVE Analysis and Report third-party-advisory
Submit #919250 | Wavlink Router Firmware V260403_2.0.0 Command Injection third-party-advisory
https://github.com/senxitoyshuyi-ui/HACKALL/blob/main/WAVLINK%20WN553X1-B%20Router/WAVLINK_WN553X1-B_wireguard_cli_command_injection.md exploit