RCE in Wavlink Wn553x1-B
CVE-2026-120240
A vulnerability was determined in WAVLINK WN553X1-B V260403_2.0.0. This issue affects the function sub_41A748 of the file /bin/ioos of the component WireGuard CLI Group Handler. Executing a manipulation of the argument group_id/group_name can lead to os command injection. The attack may be performed from remote. The exploit has been publicly disclosed and may be utilized. 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
- vuldb.com/vuln/429599 (technical-description, vdb-entry)
- vuldb.com/vuln/429599/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-120240 (third-party-advisory)
- vuldb.com/submit/919251 (third-party-advisory)
- github.com/senxitoyshuyi-ui/HACKALL/blob/main/WAVLINK WN553X1-B Router/WAVLINK_… (exploit)
Frequently asked questions
- What is CVE-2026-120240?
- CVE-2026-120240 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-2026-120240?
- Critical severity. CVSS v3 base score is 9.9 out of 10.