CVE-2020-22552 — HIGH (7.5)

Vulnerability 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.

CVSS Score

7.5

HIGH

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

NONE

Availability

HIGH

Affected Products

Vendor	Product	Versions
Snap7 Project	Snap7	1.4.1

References

http://snap7.comThird Party AdvisoryURL Repurposed
https://sourceforge.net/p/snap7/discussion/bugfix/thread/456d76fdde/Third Party Advisory
https://sourceforge.net/projects/snap7/ExploitThird Party Advisory
http://snap7.comThird Party AdvisoryURL Repurposed
https://sourceforge.net/p/snap7/discussion/bugfix/thread/456d76fdde/Third Party Advisory
https://sourceforge.net/projects/snap7/ExploitThird Party Advisory

FAQ

What is CVE-2020-22552?

CVE-2020-22552 is a vulnerability with a CVSS score of 7.5 (HIGH). 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...

How severe is CVE-2020-22552?

CVE-2020-22552 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2020-22552?

Check the references section above for vendor advisories and patch information. Affected products include: Snap7 Project Snap7.