CVE-2020-22552
CVSS v3
7.5
HIGH
EPSS Score
1.5 %
exploit probability, as of 2026-09-25
CISA KEV
No
known exploited
Exploitation
—
SSVC status
Description
The Snap7 server component in version 1.4.1, when an attacker sends a crafted packet with COTP protocol the last-data-unit flag set to No and S7 writes a var function, the Snap7 server will be crashed.
Technical details
- Published
- 2020-10-28
Frequently asked questions
What is CVE-2020-22552?
The Snap7 server component in version 1.4.1, when an attacker sends a crafted packet with COTP protocol the last-data-unit flag set to No and S7 writes a var function, the Snap7 server will be crashed.
Is CVE-2020-22552 actively exploited?
Active exploitation of CVE-2020-22552 has not been confirmed. Its EPSS score was 1.5% on 2026-09-25, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2020-22552?
CVE-2020-22552 has a CVSS v3 base score of 7.5 (HIGH severity).
Is CVE-2020-22552 affecting your environment?
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