CVE-2021-20994: WAGO: Managed Switches: Reflected Cross-site Scripting

Published May 13, 2021

Updated

In multiple managed switches by WAGO in different versions an attacker may trick a legitimate user to click a link to inject possible malicious code into the Web-Based Management.

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 CVE-2021-20994?

CVE-2021-20994 is a vulnerability found in multiple managed switches by WAGO that allows an attacker to inject possible malicious code into the Web-Based Management.

How does CVE-2021-20994 affect WAGO 0852-0303 Firmware?

CVE-2021-20994 affects WAGO 0852-0303 Firmware versions up to and including 1.2.3.s0.

How can an attacker exploit CVE-2021-20994?

An attacker can exploit CVE-2021-20994 by tricking a legitimate user into clicking a link that injects possible malicious code into the Web-Based Management.

What is the severity of CVE-2021-20994?

CVE-2021-20994 has a severity rating of 6.1 (High).

Where can I find more information about CVE-2021-20994?

You can find more information about CVE-2021-20994 at the following reference: https://cert.vde.com/en-us/advisories/vde-2021-013