CVE-2020-22552

HighCVSS 7.5/10Last modified Jul 9, 2026

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.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected software

Vendor	Product	Versions
n/a	n/a	n/a

References

https://sourceforge.net/p/snap7/discussion/bugfix/thread/456d76fdde/Third Party Advisory
https://sourceforge.net/projects/snap7/Exploit, Third Party Advisory
https://sourceforge.net/p/snap7/discussion/bugfix/thread/456d76fdde/Third Party Advisory
https://sourceforge.net/projects/snap7/Exploit, Third Party Advisory

Timeline

Published: Oct 28, 2020
Last modified: Jul 9, 2026
NVD status: Modified

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