CVE-2021-35031: OS Command Injection

Q: What is the vulnerability ID for this Zyxel firmware vulnerability?

The vulnerability ID for this Zyxel firmware vulnerability is CVE-2021-35031.

Q: How does this vulnerability in Zyxel firmware impact users?

This vulnerability in Zyxel firmware could allow an authenticated LAN user to execute arbitrary OS commands via the GUI of the vulnerable device.

Q: Which Zyxel firmware versions are affected by this vulnerability?

Zyxel GS1900 series firmware versions 2.70(aahh.0)-20211208, XGS1210 series firmware version 1.00(abty.5)c0, and XGS1250 series firmware version 1.00(abwe.1)c0 are affected by this vulnerability.

Q: What is the severity level of this vulnerability?

This vulnerability has a severity level of high (8).

Q: How can I fix this vulnerability in Zyxel firmware?

To fix this vulnerability, it is recommended to update the firmware to a version that is not affected by the vulnerability.

Published Dec 28, 2021

Updated

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.

Affected Software

28 affected components

Zyxel GS1900-8 firmware<2.70\(aahh.0\)-20211208

Zyxel GS1900-8

Zyxel GS1900-8HP firmware<2.70\(aahi.0\)-20211208

Zyxel GS1900-8HP

Zyxel GS1900-10HP firmware<2.70\(aazi.0\)-20211208

Zyxel GS1900-10HP

Zyxel Gs1900-16 Firmware<2.70\(aahj.0\)-20211208

Zyxel Gs1900-16

Zyxel Gs1900-24e Firmware<2.70\(aahk.0\)-20211208

Zyxel GS1900-24E

Zyxel Gs1900-24ep Firmware<2.70\(abto.0\)-20211208

Zyxel GS1900-24EP

Zyxel Gs1900-24 Firmware<2.70\(aahl.0\)-20211208

Zyxel GS1900-24

Zyxel Gs1900-24hp Firmware<2.70\(aahm.0\)-20211208

Zyxel Gs1900-24hp

Zyxel Gs1900-24hpv2 Firmware<2.70\(aatp.0\)-20211208

Zyxel Gs1900-24hpv2

Zyxel Gs1900-48 Firmware<2.70\(aahn.0\)-20211208

Zyxel GS1900-48

Zyxel Gs1900-48hp Firmware<2.70\(aaho.0\)-20211208

Zyxel Gs1900-48hp

Zyxel Gs1900-48hpv2 Firmware<2.70\(abtq.0\)-20211208

Zyxel Gs1900-48hpv2

Zyxel Xgs1210-12 Firmware<1.00\(abty.5\)c0

Zyxel Xgs1210-12

Zyxel Xgs1250-12 Firmware<1.00\(abwe.1\)c0

Zyxel Xgs1250-12

Remediation

Patch Available

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

Event History

Dec 28, 2021

CVE Published

via MITRE·10:36 AM

Data Sourced

via MITRE·10:36 AM

DescriptionSeverityWeakness

Frequently Asked Questions

What is the vulnerability ID for this Zyxel firmware vulnerability?

The vulnerability ID for this Zyxel firmware vulnerability is CVE-2021-35031.

How does this vulnerability in Zyxel firmware impact users?

This vulnerability in Zyxel firmware could allow an authenticated LAN user to execute arbitrary OS commands via the GUI of the vulnerable device.

Which Zyxel firmware versions are affected by this vulnerability?