CVE-2021-35033

Q: How do I fix CVE-2021-35033?

Published advisories record a fix for 6 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Q: Is CVE-2021-35033 being actively exploited?

Not that we know of. CVE-2021-35033 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.40% is the estimated probability that it will be exploited in the next 30 days. That is higher than 32% of all scored CVEs.

Q: How severe is CVE-2021-35033?

CVE-2021-35033 has a CVSS v3 base score of 7.8, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2021-35033 affect?

Published advisories record a fix for nbg6818 firmware (NVD), nbg7815 firmware (NVD), wsq20 firmware (NVD), wsq50 firmware (NVD), and 2 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

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

Related Vulnerabilities

Other CWE-260 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2017-7925	Critical	9.8	51%	-	-
CVE-2017-7923	High	8.8	2.3%	-	-
CVE-2016-7043	Medium	5.9	1.5%	-	Fix
CVE-2019-3780	High	8.8	1.4%	-	Fix
CVE-2023-34128	Critical	9.8	0.7%	-	Fix
CVE-2023-53739	Unscored	-	0.6%	-	-

Common questions

How do I fix CVE-2021-35033?

Published advisories record a fix for 6 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2021-35033 being actively exploited?

Not that we know of. CVE-2021-35033 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.40% is the estimated probability that it will be exploited in the next 30 days. That is higher than 32% of all scored CVEs.

How severe is CVE-2021-35033?

CVE-2021-35033 has a CVSS v3 base score of 7.8, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2021-35033 affect?

Published advisories record a fix for nbg6818 firmware (NVD), nbg7815 firmware (NVD), wsq20 firmware (NVD), wsq50 firmware (NVD), and 2 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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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.