Vulnerability CVE-2020-22552
Published: 2020-10-28

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.

Type:

NVD-CWE-noinfo

CVSS2 => (AV:N/AC:L/Au:N/C:N/I:N/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
5/10
2.9/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
None
None
Partial
Affected software
Snap7 project -> Snap7 

 References:
http://snap7.com
https://sourceforge.net/p/snap7/discussion/bugfix/thread/456d76fdde/
https://sourceforge.net/projects/snap7/
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