CVE-2021-21001

WAGO: PFC200 Access to files outside the home directory

Description

On WAGO PFC200 devices in different firmware versions with special crafted packets an authorised attacker with network access to the device can access the file system with higher privileges.

Remediation

Solution:

  • WAGO recommends all effected users with CODESYS 2.3 Runtime PLCs to update to the firmware versions listed at https://cert.vde.com/en-us/advisories/vde-2021-014 in the solution paragraph.

Workaround:

  • Use general security best practices to protect systems from local and network attacks. Do not allow direct access to the device from untrusted networks. Update to the latest firmware according to the table in chapter solutions.

Category

9.1
CVSS
Severity: Critical
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.32%
Third-Party Advisory vde.com
Affected: WAGO Series PFC200 Controller
Affected: WAGO Series Ethernet Controller
Published at:
Updated at:

References

Link Tags
https://cert.vde.com/en-us/advisories/vde-2021-014 third party advisory

Frequently Asked Questions

What is the severity of CVE-2021-21001?
CVE-2021-21001 has been scored as a critical severity vulnerability.
How to fix CVE-2021-21001?
To fix CVE-2021-21001: WAGO recommends all effected users with CODESYS 2.3 Runtime PLCs to update to the firmware versions listed at https://cert.vde.com/en-us/advisories/vde-2021-014 in the solution paragraph.
Is CVE-2021-21001 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-21001 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-21001?
CVE-2021-21001 affects WAGO Series PFC200 Controller, WAGO Series Ethernet Controller.
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