CVE-2021-35030

Severity Score

4.3

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

Se ha encontrado una vulnerabilidad en el programa CGI de Zyxel GS1900-8 versión del firmware V2.60, que no esterilizaba apropiadamente el contenido de los paquetes y podía permitir a un usuario local autenticado llevar a cabo un ataque de tipo cross-site scripting (XSS) por medio de un paquete LLDP diseñado

*Credits: N/A

CVSS Scores

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

High

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

Low

Attack Vector

Adjacent

Attack Complexity

Medium

Authentication

Single

Confidentiality

None

Integrity

Partial

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-06-17 CVE Reserved
2021-07-26 CVE Published
2023-03-08 EPSS Updated
2024-09-17 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CAPEC

References (1)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC
https://www.zyxel.com/support/Zyxel_security_advisory_for_XSS_vulnerability_of_GS1900_series_switches.shtml	2021-08-13

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Zyxel Search vendor "Zyxel"	Gs1900-8 Firmware Search vendor "Zyxel" for product "Gs1900-8 Firmware"	< 2.70 Search vendor "Zyxel" for product "Gs1900-8 Firmware" and version " < 2.70"	-	Affected	in	Zyxel Search vendor "Zyxel"	Gs1900-8 Search vendor "Zyxel" for product "Gs1900-8"	-	-	Safe
Zyxel Search vendor "Zyxel"	Gs1900-8hp Firmware Search vendor "Zyxel" for product "Gs1900-8hp Firmware"	< 2.70 Search vendor "Zyxel" for product "Gs1900-8hp Firmware" and version " < 2.70"	-	Affected	in	Zyxel Search vendor "Zyxel"	Gs1900-8hp Search vendor "Zyxel" for product "Gs1900-8hp"	-	-	Safe
Zyxel Search vendor "Zyxel"	Gs1900-10hp Firmware Search vendor "Zyxel" for product "Gs1900-10hp Firmware"	< 2.70 Search vendor "Zyxel" for product "Gs1900-10hp Firmware" and version " < 2.70"	-	Affected	in	Zyxel Search vendor "Zyxel"	Gs1900-10hp Search vendor "Zyxel" for product "Gs1900-10hp"	-	-	Safe
Zyxel Search vendor "Zyxel"	Gs1900-16 Firmware Search vendor "Zyxel" for product "Gs1900-16 Firmware"	< 2.70 Search vendor "Zyxel" for product "Gs1900-16 Firmware" and version " < 2.70"	-	Affected	in	Zyxel Search vendor "Zyxel"	Gs1900-16 Search vendor "Zyxel" for product "Gs1900-16"	-	-	Safe
Zyxel Search vendor "Zyxel"	Gs1900-24e Firmware Search vendor "Zyxel" for product "Gs1900-24e Firmware"	< 2.70 Search vendor "Zyxel" for product "Gs1900-24e Firmware" and version " < 2.70"	-	Affected	in	Zyxel Search vendor "Zyxel"	Gs1900-24e Search vendor "Zyxel" for product "Gs1900-24e"	-	-	Safe
Zyxel Search vendor "Zyxel"	Gs1900-24ep Firmware Search vendor "Zyxel" for product "Gs1900-24ep Firmware"	< 2.70 Search vendor "Zyxel" for product "Gs1900-24ep Firmware" and version " < 2.70"	-	Affected	in	Zyxel Search vendor "Zyxel"	Gs1900-24ep Search vendor "Zyxel" for product "Gs1900-24ep"	-	-	Safe
Zyxel Search vendor "Zyxel"	Gs1900-24 Firmware Search vendor "Zyxel" for product "Gs1900-24 Firmware"	< 2.70 Search vendor "Zyxel" for product "Gs1900-24 Firmware" and version " < 2.70"	-	Affected	in	Zyxel Search vendor "Zyxel"	Gs1900-24 Search vendor "Zyxel" for product "Gs1900-24"	-	-	Safe
Zyxel Search vendor "Zyxel"	Gs1900-24hp Firmware Search vendor "Zyxel" for product "Gs1900-24hp Firmware"	< 2.70 Search vendor "Zyxel" for product "Gs1900-24hp Firmware" and version " < 2.70"	-	Affected	in	Zyxel Search vendor "Zyxel"	Gs1900-24hp Search vendor "Zyxel" for product "Gs1900-24hp"	-	-	Safe
Zyxel Search vendor "Zyxel"	Gs1900-24hpv2 Firmware Search vendor "Zyxel" for product "Gs1900-24hpv2 Firmware"	< 2.70 Search vendor "Zyxel" for product "Gs1900-24hpv2 Firmware" and version " < 2.70"	-	Affected	in	Zyxel Search vendor "Zyxel"	Gs1900-24hpv2 Search vendor "Zyxel" for product "Gs1900-24hpv2"	-	-	Safe
Zyxel Search vendor "Zyxel"	Gs1900-48 Firmware Search vendor "Zyxel" for product "Gs1900-48 Firmware"	< 2.70 Search vendor "Zyxel" for product "Gs1900-48 Firmware" and version " < 2.70"	-	Affected	in	Zyxel Search vendor "Zyxel"	Gs1900-48 Search vendor "Zyxel" for product "Gs1900-48"	-	-	Safe
Zyxel Search vendor "Zyxel"	Gs1900-48hp Firmware Search vendor "Zyxel" for product "Gs1900-48hp Firmware"	< 2.70 Search vendor "Zyxel" for product "Gs1900-48hp Firmware" and version " < 2.70"	-	Affected	in	Zyxel Search vendor "Zyxel"	Gs1900-48hp Search vendor "Zyxel" for product "Gs1900-48hp"	-	-	Safe
Zyxel Search vendor "Zyxel"	Gs1900-48hpv2 Firmware Search vendor "Zyxel" for product "Gs1900-48hpv2 Firmware"	< 2.70 Search vendor "Zyxel" for product "Gs1900-48hpv2 Firmware" and version " < 2.70"	-	Affected	in	Zyxel Search vendor "Zyxel"	Gs1900-48hpv2 Search vendor "Zyxel" for product "Gs1900-48hpv2"	-	-	Safe