Home/CVE/A command injection vulnerability in the web interface of the Zyxel NWA-1100-NH firmware could allow an attacker to exec
CVE

CVE-2021-4039

A command injection vulnerability in the web interface of the Zyxel NWA-1100-NH firmware could allow an attacker to exec

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 · CVSS 9.8 EPSS 0.71705
Act now
  • EPSS ≥ 0.50 - high probability of exploitation in the next 30 days
  • EPSS percentile: top 1% of all CVEs by exploitation likelihood
  • Public exploit or PoC is available
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

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

Affected Products & Versions

1
zyxel nwa1100-nh firmware< 2.12\(aasi.3\)c0
⚠

Public Exploits & PoCs

2
remoteZyxel NWA-1100-NH - Command Injection2022-04-19
pocpacketstormsecurity.com · Zyxel-NWA-1100-NH-Command-Injection.htmlpacketstormsecurity.com
◈

Detection Rules (IDS/IPS)

1
et-openET EXPLOIT Zyxel NWA-1100-NH Command Injection Attempt (CVE-2021-4039)attempted-admin
Open rulesets (ET Open, Snort Community, abuse.ch) link to source. Commercial rulesets are reference-only.
▣

Scoring & Timeline

9.8
CRITICAL · CVSS v3.1 · security@zyxel.com.tw
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD01 Mar 2022 · 07:15 AM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
🔗

References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://www.zyxel.com/support/OS-command-injection-vulnerability-of-NWA1100-NH-access-point.shtmlPatchVendor Advisory
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