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Status published
High
CVE-2020-22552
The Snap7 server component in version 1.4.1, when an attacker...
Vulnerability 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.
Impact Analysis
Refer to official advisory for detailed impact metrics.
Remediation
Ensure systems are updated to the latest vendor-supplied patch levels.
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Credits & Attribution
No credits recorded in the NVD database.
References
More from snap7 project
View All →Affected Vendor
snap7 project
View all reports →Affected Software
snap7
Vulnerable Versions:
1.4.1
Timeline
Official Publish:
October 28th, 2020
Last Modified:
July 9th, 2026
Added to House:
July 21st, 2026
CVSS Vectors
V3:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weaknesses (CWE)
No CWE data available
MITRE ATT&CK TTPs
No associated TTPs found for this vulnerability.