CVE-2021-35031

Severity Score

8.0

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

A vulnerability in the TFTP client of Zyxel GS1900 series firmware, XGS1210 series firmware, and XGS1250 series firmware, which could allow an authenticated LAN user to execute arbitrary OS commands via the GUI of the vulnerable device.

Una vulnerabilidad en el cliente TFTP del firmware de la serie Zyxel GS1900 versión 2.60, podría permitir a un usuario local autenticado ejecutar comandos arbitrarios del SO

*Credits: N/A

CVSS Scores

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Adjacent

Attack Complexity

Low

Authentication

Single

Confidentiality

Complete

Integrity

Complete

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-06-17 CVE Reserved
2021-12-28 CVE Published
2023-07-21 EPSS Updated
2024-08-04 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

CAPEC

References (1)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC
https://www.zyxel.com/support/Zyxel_security_advisory_for_OS_command_injection_vulnerabilities_of_switches.shtml	2022-01-07

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\(aahh.0\)-20211208 Search vendor "Zyxel" for product "Gs1900-8 Firmware" and version " < 2.70\(aahh.0\)-20211208"	-	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\(aahi.0\)-20211208 Search vendor "Zyxel" for product "Gs1900-8hp Firmware" and version " < 2.70\(aahi.0\)-20211208"	-	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\(aazi.0\)-20211208 Search vendor "Zyxel" for product "Gs1900-10hp Firmware" and version " < 2.70\(aazi.0\)-20211208"	-	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\(aahj.0\)-20211208 Search vendor "Zyxel" for product "Gs1900-16 Firmware" and version " < 2.70\(aahj.0\)-20211208"	-	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\(aahk.0\)-20211208 Search vendor "Zyxel" for product "Gs1900-24e Firmware" and version " < 2.70\(aahk.0\)-20211208"	-	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\(abto.0\)-20211208 Search vendor "Zyxel" for product "Gs1900-24ep Firmware" and version " < 2.70\(abto.0\)-20211208"	-	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\(aahl.0\)-20211208 Search vendor "Zyxel" for product "Gs1900-24 Firmware" and version " < 2.70\(aahl.0\)-20211208"	-	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\(aahm.0\)-20211208 Search vendor "Zyxel" for product "Gs1900-24hp Firmware" and version " < 2.70\(aahm.0\)-20211208"	-	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\(aatp.0\)-20211208 Search vendor "Zyxel" for product "Gs1900-24hpv2 Firmware" and version " < 2.70\(aatp.0\)-20211208"	-	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\(aahn.0\)-20211208 Search vendor "Zyxel" for product "Gs1900-48 Firmware" and version " < 2.70\(aahn.0\)-20211208"	-	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\(aaho.0\)-20211208 Search vendor "Zyxel" for product "Gs1900-48hp Firmware" and version " < 2.70\(aaho.0\)-20211208"	-	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\(abtq.0\)-20211208 Search vendor "Zyxel" for product "Gs1900-48hpv2 Firmware" and version " < 2.70\(abtq.0\)-20211208"	-	Affected	in	Zyxel Search vendor "Zyxel"	Gs1900-48hpv2 Search vendor "Zyxel" for product "Gs1900-48hpv2"	-	-	Safe
Zyxel Search vendor "Zyxel"	Xgs1210-12 Firmware Search vendor "Zyxel" for product "Xgs1210-12 Firmware"	< 1.00\(abty.5\)c0 Search vendor "Zyxel" for product "Xgs1210-12 Firmware" and version " < 1.00\(abty.5\)c0"	-	Affected	in	Zyxel Search vendor "Zyxel"	Xgs1210-12 Search vendor "Zyxel" for product "Xgs1210-12"	-	-	Safe
Zyxel Search vendor "Zyxel"	Xgs1250-12 Firmware Search vendor "Zyxel" for product "Xgs1250-12 Firmware"	< 1.00\(abwe.1\)c0 Search vendor "Zyxel" for product "Xgs1250-12 Firmware" and version " < 1.00\(abwe.1\)c0"	-	Affected	in	Zyxel Search vendor "Zyxel"	Xgs1250-12 Search vendor "Zyxel" for product "Xgs1250-12"	-	-	Safe