CVE-2021-20995: WAGO: Managed Switches: Storage of user credentials in a cookie

Published May 13, 2021

Updated

In multiple managed switches by WAGO in different versions the webserver cookies of the web based UI contain user credentials.

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-2021-20995?

CVE-2021-20995 is a vulnerability in multiple managed switches by WAGO where the webserver cookies of the web-based UI contain user credentials.

Which versions of WAGO switches are affected by CVE-2021-20995?

Multiple versions of WAGO switches, including Wago 0852-0303 Firmware (up to version 1.2.3.s0), Wago 0852-1305 Firmware (up to version 1.1.7.s0), and Wago 0852-1505 Firmware (up to version 1.1.6.s0), are affected by CVE-2021-20995.

What is the severity of CVE-2021-20995?

CVE-2021-20995 has a severity rating of 7.5 (high).

How can I fix CVE-2021-20995?

To fix CVE-2021-20995, it is recommended to update the firmware of the affected WAGO switches to a version that is not vulnerable.

Where can I find more information about CVE-2021-20995?

You can find more information about CVE-2021-20995 on the VDE CERT website at the following link: https://cert.vde.com/en-us/advisories/vde-2021-013