CVE-2021-35033
7.8 · HIGHOverview
CVE-2021-35033 is a high-severity vulnerability affecting zyxel nbg6818_firmware. It was published on November 23, 2021 and has a CVSS 3.1 base score of 7.8 (HIGH).
This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.
Technical Description
A vulnerability in specific versions of Zyxel NBG6818, NBG7815, WSQ20, WSQ50, WSQ60, and WSR30 firmware with pre-configured password management could allow an attacker to obtain root access of the device, if the local attacker dismantles the device and uses a USB-to-UART cable to connect the device, or if the remote assistance feature had been enabled by an authenticated user.
Remediation
Check the references section for vendor advisories and patches from zyxel. Update nbg6818_firmware to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| zyxel | nbg6818_firmware | >= 0, < 1.00\(absc.5\)c0 | Affected |
| zyxel | nbg7815_firmware | >= 0, < 1.00\(absk.7\)c0 | Affected |
| zyxel | wsq20_firmware | >= 0, < 1.00\(abof.11\)c0 | Affected |
| zyxel | wsq50_firmware | >= 0, < 2.20\(abkj.7\)c0 | Affected |
| zyxel | wsq60_firmware | >= 0, < 2.20\(abnd.8\)c0 | Affected |
| zyxel | wsr30_firmware | >= 0, < 1.00\(abmy.12\)c0 | Affected |
References
Frequently Asked Questions
What is CVE-2021-35033?
CVE-2021-35033 is a high-severity vulnerability affecting zyxel nbg6818_firmware. It was published on November 23, 2021 and has a CVSS 3.1 base score of 7.8 (HIGH).
How severe is CVE-2021-35033?
This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2021-35033?
Check the references section for vendor advisories and patches from zyxel. Update nbg6818_firmware to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2021-35033?
CyberStrike's AI-powered security agents can automatically detect CVE-2021-35033 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
Automated penetration testing that runs continuously, not just quarterly.
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Browser-based exploitation validates findings with real proof-of-concept.
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