CVE-2020-22552: SNAP7 Project SNAP7

High severity, CVSS 7.5. EPSS: 1.5% chance of exploitation in the next 30 days.

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.

Affected products

• SNAP7 Project SNAP7: version 1.4.1 only

Published 2020-10-28. Last modified 2026-07-09.