RCE in Zyxel Nwa1100-Nh
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.
Vulnerability class: Command Injection (OS Command Injection)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.710 (99.4th percentile), scored .
High probability of exploitation in the next 30 days — patch promptly. 99th percentile — 99.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.710 · newest: 0.710 · change: 0.000
Affected products
- Zyxel Nwa1100-Nh
- Zyxel Nwa1100-Nh Firmware — versions 2.12(AASI.0)C0
- Zyxel Nwa1100-Nh Firmware
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.zyxel.com/support/OS-command-injection-vulnerability-of-NWA1100-NH-access-p… (Patch, Vendor Advisory)
- packetstormsecurity.com/files/166752/Zyxel-NWA-1100-NH-Command-Injection.html (Exploit, VDB Entry, Third Party Advisory, Release Notes)
Frequently asked questions
- What is CVE-2021-4039?
- CVE-2021-4039 is a critical-severity vulnerability in Zyxel Nwa1100-Nh, classified under OS Command Injection. CVSS score: 9.8/10. Published 2022-03-01.
- How severe is CVE-2021-4039?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2021-4039 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.