CVE-2021-21778
CVSS v3
7.5
HIGH
EPSS Score
1.3 %
exploit probability, as of 2026-09-25
CISA KEV
No
known exploited
Exploitation
—
SSVC status
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.
Technical details
- Published
- 2021-08-25
Frequently asked questions
What is CVE-2021-21778?
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.
Is CVE-2021-21778 actively exploited?
Active exploitation of CVE-2021-21778 has not been confirmed. Its EPSS score was 1.3% on 2026-09-25, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2021-21778?
CVE-2021-21778 has a CVSS v3 base score of 7.5 (HIGH severity).
Is CVE-2021-21778 affecting your environment?
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