Vulnerability Details : CVE-2021-35033
Potential exploit
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.
Vulnerability category: BypassGain privilege
Products affected by CVE-2021-35033
- cpe:2.3:o:zyxel:nbg6818_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:nbg7815_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:wsq20_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:wsq50_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:wsq60_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:wsr30_firmware:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-35033
0.04%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 6 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-35033
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
6.9
|
MEDIUM | AV:L/AC:M/Au:N/C:C/I:C/A:C |
3.4
|
10.0
|
NIST | |
7.8
|
HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
1.8
|
5.9
|
NIST | |
7.8
|
HIGH | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
1.8
|
5.9
|
Zyxel Corporation |
CWE ids for CVE-2021-35033
-
The product stores a password in a configuration file that might be accessible to actors who do not know the password.Assigned by: security@zyxel.com.tw (Secondary)
-
When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.Assigned by: nvd@nist.gov (Primary)
References for CVE-2021-35033
-
https://www.zyxel.com/support/Zyxel_security_advisory_for_pre-configured_password_management_vulnerability_of_home_routers_and_WiFi_systems.shtml
Zyxel security advisory for pre-configured password management vulnerability of home routers and WiFi systems | ZyxelVendor Advisory
-
https://www.tenable.com/security/research/tra-2022-06
Zyxel Routers and Home WiFi Systems - Unprotected Root Access via UART Using Default Password - Research Advisory | TenableĀ®Exploit;Third Party Advisory
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