CVE-2021-43987

Name: CVE-2021-43987
Creator: NVD / NIST
Published: 2021-12-23T20:15:11.767+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.18%

Last modified Jun 17, 2026

CVE-2021-43987 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. An additional, nondocumented administrative account exists in mySCADA myPRO Versions 8.20.0 and prior that is not exposed through the web interface, which cannot be deleted or changed through the regular web interface.. EPSS estimates a 1.18% chance of exploitation in the next 30 days.

Description

An additional, nondocumented administrative account exists in mySCADA myPRO Versions 8.20.0 and prior that is not exposed through the web interface, which cannot be deleted or changed through the regular web interface.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

1.18%

63.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-912

Affected Software

Vendor	Product	Versions
Myscada	Mypro	<= 8.20.0

References

https://www.cisa.gov/uscert/ics/advisories/icsa-21-355-01Third Party Advisory, US Government Resource
https://www.cisa.gov/uscert/ics/advisories/icsa-21-355-01Third Party Advisory, US Government Resource

Timeline

Published: Dec 23, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-43987?

How severe is CVE-2021-43987?

CVE-2021-43987 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.18% probability of exploitation in the next 30 days.

How do I fix CVE-2021-43987?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-43987?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST