high
8
CWE
78
Advisory Published
Updated

CVE-2021-35031: OS Command Injection

First published: Tue 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.

Credit: security@zyxel.com.tw

Affected SoftwareAffected VersionHow to fix
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

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Reference Links

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?

    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.

  • What is the severity level of this vulnerability?

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

  • 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.

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