CVE-2021-4039CWE-78

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

Critical · published March 1, 2022

Patch now

High probability of exploitation

CVSS calls it critical at 9.8. It sits in the 99.4th percentile for exploit probability.

CVSS v3.1
9.8
EPSS
71%
Percentile
99.4
In the wild
Unconfirmed
What it is

🚨 A command injection vulnerability is lurking in Zyxel NWA-1100-NH firmware, allowing attackers to run arbitrary OS commands with just a crafty request! 🔥 Think of it like a hotel concierge who grants access to any locked room just because someone whispers a magical phrase — without confirming who’s asking! This means a malicious actor could gain full control of the device, potentially manipulating settings, snooping on network traffic, or even launching further attacks on your systems. The consequences could be absolutely devastating, leaving your network exposed and vulnerable!

Put simply

Think of it like a hotel concierge who grants access to any locked room just because someone whispers a magical phrase — without confirming who’s asking! This vulnerability allows attackers to inject malicious commands through the web interface, bypassing security controls and executing arbitrary code on the underlying operating system.

What to do

This means a malicious actor could gain full control of the device, potentially manipulating settings, snooping on network traffic, or even launching further attacks on your systems. The consequences could be absolutely devastating, leaving your network exposed and vulnerable! To protect yourself, patch your firmware to the latest version immediately! Check Zyxel’s website for updates, and make sure to review your network security policies to mitigate potential risks. Don't worry, you’ve got this! By taking these steps, you’ll safeguard your network and boost your security hero status! 🛡️

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.71048 · 99.4th percentile
Weakness
CWE-78 · Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Published
2022-03-01T06:40Z
EPSS history
Timeline
  • 01 MAR 06:40Z
    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
    cvelistv5