CVE-2020-22552

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.

CVSS v3 7.5 HIGH
CVSS v2.0 5.0 MEDIUM

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

5.0^/10

CVSS v2.0 : MEDIUM

Vector : AV:N/AC:L/Au:N/C:N/I:N/A:P

Exploitability : 10.0 / Impact : 2.9

Access Vector NETWORK

Access Complexity LOW

Authentication NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact PARTIAL

References

Link	Resource
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

Configurations

Configuration 1 (hide)

cpe:2.3:a:snap7_project:snap7:1.4.1:*:*:*:*:*:*:*

History

No history.

Information

Published : 2020-10-28 14:15

Updated : 2026-07-09 00:16

NVD link : CVE-2020-22552

Mitre link : CVE-2020-22552

CVE.ORG link : CVE-2020-22552

JSON object : View

Products Affected

snap7_project

snap7

CWE

NVD-CWE-noinfo

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