CVE-2021-20998: WAGO: Managed Switches: Unauthorized creation of user accounts

Published May 13, 2021

Updated

In multiple managed switches by WAGO in different versions without authorization and with specially crafted packets it is possible to create users.

Affected Software

10 affected components

WAGO 0852-0303 Firmware<=1.2.3.s0

WAGO 0852-0303

WAGO 0852-1305 Firmware<=1.1.7.s0

WAGO 0852-1305

WAGO 0852-1505 Firmware<=1.1.6.s0

WAGO 0852-1505

WAGO 0852-1305\/000-001 Firmware<=1.0.4.s0

WAGO 0852-1305\/000-001

WAGO 0852-1505\/000-001 Firmware<=1.0.4.s0

WAGO 0852-1505\/000-001

Remediation

Information

The Web-Based Management is only needed during installation and commissioning, not during normal operations. It is recommended to disable the web server after commissioning. The Command Line Interface (CLI) is an alternative for commissioning the device. This is the easiest and securest way to protect your device from the listed vulnerabilities. Regardless of the action described above, the vulnerabilities are fixed with following firmware releases: Item number [FW version] 0852-0303 (HW < 3)* [V1.2.5.S0] Detailed information about the hardware version is described in the installation guide. 0852-0303 (HW >=3)* [V1.2.3.S1] Detailed information about the hardware version is described in the installation guide. 0852-1305 [V1.1.8.S0] 0852-1505 [V1.1.7.S0] 0852-1305/000-001 [V1.1.4.S0] 0852-1505/000-001 [V1.1.4.S0]

Event History

May 13, 2021

CVE Published

via MITRE·01:45 PM

Data Sourced

via MITRE·01:45 PM

RemedyDescriptionSeverityWeakness

Frequently Asked Questions

What is vulnerability CVE-2021-20998?

Vulnerability CVE-2021-20998 is a vulnerability found in multiple managed switches by WAGO, which allows the creation of users without authorization and with specially crafted packets.

What is the severity of CVE-2021-20998?

The severity of vulnerability CVE-2021-20998 is rated as critical with a severity value of 9.8.

Which software versions are affected by CVE-2021-20998?

The software versions affected by vulnerability CVE-2021-20998 are: Wago 0852-0303 Firmware (up to version 1.2.3.s0), Wago 0852-1305 Firmware (up to version 1.1.7.s0), Wago 0852-1505 Firmware (up to version 1.1.6.s0), Wago 0852-1305/000-001 Firmware (up to version 1.0.4.s0), and Wago 0852-1505/000-001 Firmware (up to version 1.0.4.s0).

How can the vulnerability CVE-2021-20998 be exploited?

Vulnerability CVE-2021-20998 can be exploited by sending specially crafted packets to the affected managed switches by WAGO.

Is Wago 0852-0303 vulnerable to CVE-2021-20998?

Yes, Wago 0852-0303 is vulnerable to CVE-2021-20998 up to version 1.2.3.s0.