Vulnerability · Published Nov 23, 2021 · Assigned by Zyxel
CVE-2021-35033
High 7.8
In plain English
A high-severity security flaw in NBG6818 series firmware from Zyxel. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 35% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Zyxel | NBG6818 series firmware | 1.00(ABSC.0)C0 through 1.00(ABSC.4)C0 |
| Zyxel | NBG7815 series firmware | 1.00(ABSK.0)C0 through 1.00(ABSK.6)C0 |
| Zyxel | WSQ20 series firmware | 1.00(ABOF.0)C0 through 1.00(ABOF.10)C0 |
| Zyxel | WSQ50 series firmware | 1.00(ABKJ.0)C0 through 2.20(ABKJ.6)C0 |
| Zyxel | WSQ60 series firmware | 1.00(ABND.0)C0 through 2.20(ABND.7)C0 |
| Zyxel | WSR30 series firmware | 1.00(ABMY.0)C0 through 1.00(ABMY.11)C0 |
Weakness: CWE-260 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H