CVE-2021-4039
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.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 71.0%, higher than 99% of all known CVEs. Patch or mitigate before the next change window.
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 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 71.05% probability · 99th percentile
- Public exploits
- 1 in Exploit-DB · first 19 April 2022
- CISA KEV
- Not listed
- Weakness
- CWE-78
- Affected
- zyxel/nwa1100-nh firmware
- Source
- security@zyxel.com.tw
EPSS 71.0% since 3 November 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
Public exploits (1)
Entries in Exploit-DB that cite this CVE. Links go to the Exploit-DB page and to the file in the public repository; nothing is hosted here. A verified tick means the Exploit-DB team confirmed the exploit works against the stated version.
References
- http://packetstormsecurity.com/files/166752/Zyxel-NWA-1100-NH-Command-Injection.htmlExploit, Release Notes, Third Party Advisory, VDB Entry
- https://www.zyxel.com/support/OS-command-injection-vulnerability-of-NWA1100-NH-access-point.shtmlPatch, Vendor Advisory
- http://packetstormsecurity.com/files/166752/Zyxel-NWA-1100-NH-Command-Injection.htmlExploit, Release Notes, Third Party Advisory, VDB Entry
- https://www.zyxel.com/support/OS-command-injection-vulnerability-of-NWA1100-NH-access-point.shtmlPatch, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.