VULNERABILITY INTELLIGENCE

CVE-2021-4039

CVSS score9.8 CRITICAL

EPSS probability71.05%

CISA KEVNot currently listed

Published2022-03-01

Last modified2026-06-17

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Description

A command injection vulnerability in the web interface of the Zyxel NWA-1100-NH firmware could allow an attacker to execute arbitrary OS commands on the device.

Weakness classification

CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Primary references

security@zyxel.com.tw — Exploit, Release Notes, Third Party Advisory, VDB Entry
security@zyxel.com.tw — Patch, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108 — Exploit, Release Notes, Third Party Advisory, VDB Entry
af854a3a-2127-422b-91ae-364da2661108 — Patch, Vendor Advisory