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MitreCVE-2020-22552

HistoryOct 28, 2020 - 2:15 p.m.

CVE-2020-22552

2020-10-2814:15:12

mitre

web.nvd.nist.gov

cve-2020-22552

snap7 server

version 1.4.1

cotp protocol

crafted packet

crash

nvd

CVSS2

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

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

CVSS3

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

AI Score

7.3

Confidence

High

EPSS

0.002

Percentile

64.5%

JSON

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 configurations

Nvd

Node

snap7_projectsnap7Match1.4.1

VendorProductVersionCPE
snap7_projectsnap71.4.1cpe:2.3:a:snap7_project:snap7:1.4.1:*:*:*:*:*:*:*

Vendor	Product	Version	CPE
snap7_project	snap7	1.4.1	cpe:2.3:a:snap7_project:snap7:1.4.1:::::::*

References

snap7.com

sourceforge.net/p/snap7/discussion/bugfix/thread/456d76fdde/

sourceforge.net/projects/snap7/

CVSS2

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

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

CVSS3

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

AI Score

7.3

Confidence

High

EPSS

0.002

Percentile

64.5%

JSON

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