Is CVE-2021-35033 in the CISA KEV catalog?

No. CVE-2021-35033 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-35033?

CVE-2021-35033 has a CVSS v3 base score of 7.8 (HIGH).

What is the EPSS score for CVE-2021-35033?

CVE-2021-35033 has an EPSS score of 0.40% (32th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-35033?

Upgrade nbg6818 firmware to 1.00(absc.5)c0 or later. Fixes are available for 6 affected products.

CVE & CISA-KEV Catalog

CVE-2021-35033

HIGH

7.8

CVSS v3

NVD

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.

CWE-260 CWE-287Improper Authentication

How to fix

Remediation Available

nbg6818 firmwareNVD

Affected:< 1.00(absc.5)c0Fixed in:1.00(absc.5)c0CVE-2021-35033derived from NVD

nbg7815 firmwareNVD

Affected:< 1.00(absk.7)c0Fixed in:1.00(absk.7)c0CVE-2021-35033derived from NVD

wsq20 firmwareNVD

Affected:< 1.00(abof.11)c0Fixed in:1.00(abof.11)c0CVE-2021-35033derived from NVD

wsq50 firmwareNVD

Affected:< 2.20(abkj.7)c0Fixed in:2.20(abkj.7)c0CVE-2021-35033derived from NVD

wsq60 firmwareNVD

Affected:< 2.20(abnd.8)c0Fixed in:2.20(abnd.8)c0CVE-2021-35033derived from NVD

wsr30 firmwareNVD

Affected:< 1.00(abmy.12)c0Fixed in:1.00(abmy.12)c0CVE-2021-35033derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Exploit Intelligence

0.40%probability of exploitation in 30 days

32ndpercentile

Low risk: more likely to be exploited than 32% of all known CVEs.

References

Exploit1

tenable.com

Vendor Advisory1

zyxel.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.