10

CVE-2021-4039: zyxel nwa1100-nh_firmware OS Command Injection

CVSS: 10.0v2.0HighModified
Published 01-03-2022Last modified 03-08-2024
Open JSON

Vulnerability summary

CVE-2021-4039 is a high (CVSS 10.0) OS Command Injection vulnerability in zyxel nwa1100-nh_firmware. EPSS estimates a 71.05% chance of exploitation in the next 30 days, higher than 99.4% of scored vulnerabilities. 2 public exploits are recorded.

Overall risk
90/100
0100
Critical · default modelHow is this calculated?
CVSS score
10.0/10
010
High · v2.0 (NVD)
EPSS score
71.05%
0%100%
Critical · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits2reference, exploit-database

Timeline

  1. 01-03-2022
    PublishedVulnerability first disclosed.
  2. 03-08-2024
    Last modifiedVulnerability information updated.

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.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

71.05%

Chance of exploitation in the next 30 days

Percentile

99%

Versus all other CVEs

30-day change

0.00 pp

From 71.05% on 18-09-2026

18-09-202618-10-2026
EPSS score
71.05%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

2 found
  • referenceUnverified

    Exploit Reference (packetstormsecurity.com)

    Maturity: unknown

  • exploit-databaseremotehardwareUnverified

    Zyxel NWA-1100-NH - Command Injection

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Zyxel2 products

1 vendor · 2 products

References

2 links