What’s Vulnerable › Vulnerabilities

CVE-2020-22552

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-10-28 · updated 2026-07-09

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.

Affected products

• Snap7 Project Snap7: 1.4.1

References

• https://sourceforge.net/p/snap7/discussion/bugfix/thread/456d76fdde/
• https://sourceforge.net/projects/snap7/
• https://sourceforge.net/p/snap7/discussion/bugfix/thread/456d76fdde/
• https://sourceforge.net/projects/snap7/

Get alerted when CVE-2020-22552 or the next vulnerability affects your stack