CVE-2021-20993: WAGO: Managed Switches: Exposure of sensitive information through directory listing

Published May 13, 2021

Updated

In multiple managed switches by WAGO in different versions the activated directory listing provides an attacker with the index of the resources located inside the directory.

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-2021-20993?

CVE-2021-20993 is a vulnerability found in multiple managed switches by WAGO that allows an attacker to access the directory listing and obtain the index of the resources.

How severe is CVE-2021-20993?

CVE-2021-20993 has a severity rating of 5.3, which is considered medium.

Which software versions are affected by CVE-2021-20993?

CVE-2021-20993 affects Wago 0852-0303 Firmware versions up to and including 1.2.3.s0, Wago 0852-1305 Firmware versions up to and including 1.1.7.s0, Wago 0852-1505 Firmware versions up to and including 1.1.6.s0, Wago 0852-1305/000-001 Firmware versions up to and including 1.0.4.s0, and Wago 0852-1505/000-001 Firmware versions up to and including 1.0.4.s0.

How does CVE-2021-20993 affect Wago 0852-0303?

Wago 0852-0303 is vulnerable to CVE-2021-20993 if it is running firmware version 1.2.3.s0 or below.

Is Wago 0852-1305/000-001 affected by CVE-2021-20993?

No, Wago 0852-1305/000-001 is not affected by CVE-2021-20993.