RCE in Wavlink Wn553x1-B
CVE-2026-120239
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.
Vulnerability class: Command Injection (OS Command Injection)
Published .
CVSS v3 metric
CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Wavlink Wn553x1-B — versions V260403_2.0.0
Weakness classification (CWE)
References
- github.com/senxitoyshuyi-ui/HACKALL/blob/main/WAVLINK WN553X1-B Router/WAVLINK_… (exploit)
- vuldb.com/cve/CVE-2026-120239 (third-party-advisory)
- vuldb.com/submit/919250 (third-party-advisory)
- vuldb.com/vuln/429598 (technical-description, vdb-entry)
- vuldb.com/vuln/429598/cti (signature, permissions-required)
Frequently asked questions
- What is CVE-2026-120239?
- CVE-2026-120239 is a critical-severity vulnerability in Wavlink Wn553x1-B, classified under Command Injection. CVSS score: 9.9/10. Published 2026-11-01.
- How severe is CVE-2026-120239?
- Critical severity. CVSS v3 base score is 9.9 out of 10.