CVE-2021-21778

Name: CVE-2021-21778
Creator: NVD / NIST
Published: 2021-08-25T19:15:08.417+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.26%

Last modified Jun 17, 2026

CVE-2021-21778 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. A denial of service vulnerability exists in the ASDU message processing functionality of MZ Automation GmbH lib60870.NET 2.2.0. A specially crafted network request can lead to loss of communications. EPSS estimates a 1.26% chance of exploitation in the next 30 days.

Description

A denial of service vulnerability exists in the ASDU message processing functionality of MZ Automation GmbH lib60870.NET 2.2.0. A specially crafted network request can lead to loss of communications. An attacker can send an unauthenticated message to trigger this vulnerability.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

1.26%

65.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-617

Affected Software

Vendor	Product	Versions
Mz-Automation	Lib60870	2.2.0

References

https://talosintelligence.com/vulnerability_reports/TALOS-2021-1236Exploit, Third Party Advisory
https://talosintelligence.com/vulnerability_reports/TALOS-2021-1236Exploit, Third Party Advisory

Timeline

Published: Aug 25, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-21778?

How severe is CVE-2021-21778?

CVE-2021-21778 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.26% probability of exploitation in the next 30 days.

How do I fix CVE-2021-21778?

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-2021-21778?

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

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Source: NVD / NIST