What is the vulnerability ID for this vulnerability?

The vulnerability ID for this vulnerability is CVE-2021-35030.

What is the severity level of CVE-2021-35030?

The severity level of CVE-2021-35030 is medium (4.3).

Which software is affected by CVE-2021-35030?

The Zyxel GS1900-8 firmware versions up to and excluding V2.70 are affected by CVE-2021-35030.

Where can I find more information about CVE-2021-35030?

You can find more information about CVE-2021-35030 at the Zyxel security advisory page: https://www.zyxel.com/support/Zyxel_security_advisory_for_XSS_vulnerability_of_GS1900_series_switches.shtml

Vulnerability/
CVE-2021-35030

medium

4.3

CWE

26/7/2021

13/8/2021

CVE-2021-35030: XSS

Q: What is the impact of CVE-2021-35030?

CVE-2021-35030 could allow an authenticated, local user to perform a cross-site scripting (XSS) attack via a crafted LLDP packet.

First published: Mon Jul 26 2021(Updated: )

A vulnerability was found in the CGI program in Zyxel GS1900-8 firmware version V2.60, that did not properly sterilize packet contents and could allow an authenticated, local user to perform a cross-site scripting (XSS) attack via a crafted LLDP packet.

Credit: security@zyxel.com.tw

Affected Software	Affected Version	How to fix
Zyxel GS1900-8 firmware	<2.70
Zyxel GS1900-8
Zyxel Gs1900-8hp Firmware	<2.70
Zyxel Gs1900-8hp
Zyxel Gs1900-10hp Firmware	<2.70
Zyxel Gs1900-10hp
Zyxel Gs1900-16 Firmware	<2.70
Zyxel Gs1900-16
Zyxel Gs1900-24e Firmware	<2.70
Zyxel GS1900-24E
Zyxel Gs1900-24ep Firmware	<2.70
Zyxel GS1900-24EP
Zyxel Gs1900-24 Firmware	<2.70
Zyxel GS1900-24
Zyxel Gs1900-24hp Firmware	<2.70
Zyxel Gs1900-24hp
Zyxel Gs1900-24hpv2 Firmware	<2.70
Zyxel Gs1900-24hpv2
Zyxel Gs1900-48 Firmware	<2.70
Zyxel Gs1900-48
Zyxel Gs1900-48hp Firmware	<2.70
Zyxel Gs1900-48hp
Zyxel Gs1900-48hpv2 Firmware	<2.70
Zyxel Gs1900-48hpv2

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Reference Links

https://www.zyxel.com/support/Zyxel_security_advisory_for_XSS_vulnerability_of_GS1900_series_switches.shtml

Frequently Asked Questions

What is the vulnerability ID for this vulnerability?
The vulnerability ID for this vulnerability is CVE-2021-35030.
What is the severity level of CVE-2021-35030?
The severity level of CVE-2021-35030 is medium (4.3).
Which software is affected by CVE-2021-35030?
The Zyxel GS1900-8 firmware versions up to and excluding V2.70 are affected by CVE-2021-35030.
What is the impact of CVE-2021-35030?
CVE-2021-35030 could allow an authenticated, local user to perform a cross-site scripting (XSS) attack via a crafted LLDP packet.
Where can I find more information about CVE-2021-35030?
You can find more information about CVE-2021-35030 at the Zyxel security advisory page: https://www.zyxel.com/support/Zyxel_security_advisory_for_XSS_vulnerability_of_GS1900_series_switches.shtml

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