CVE-2021-4039
CRITICALCVSS 9.8/10EPSS 71.05%
Last modified
CVE-2021-4039 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 71.05% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Zyxel | Nwa1100-Nh Firmware | < 2.12\(aasi.3\)c0 |
References
- http://packetstormsecurity.com/files/166752/Zyxel-NWA-1100-NH-Command-Injection.htmlExploit, Release Notes, Third Party Advisory, VDB Entry
- http://packetstormsecurity.com/files/166752/Zyxel-NWA-1100-NH-Command-Injection.htmlExploit, Release Notes, Third Party Advisory, VDB Entry
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is 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.
How severe is CVE-2021-4039?
CVE-2021-4039 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 71.05% probability of exploitation in the next 30 days.
How do I fix CVE-2021-4039?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
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Are you affected by CVE-2021-4039?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST