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MitreCVE-2021-37740

HistoryApr 20, 2022 - 8:15 p.m.

CVE-2021-37740

2022-04-2020:15:07

mitre

web.nvd.nist.gov

cve-2021-37740

denial of service

mdt

knxnet/ip

secure router

firmware

vulnerability

nvd

CVSS2

7.8

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

COMPLETE

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

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

0.005

Percentile

77.1%

JSON

A denial of service vulnerability exists in MDT’s firmware for the KNXnet/IP Secure router SCN-IP100.03 and KNX IP interface SCN-IP000.03 before v3.0.4, that allows a remote attacker to turn the device unresponsive to all requests on the KNXnet/IP Secure layer, until the device is rebooted, via a SESSION_REQUEST frame with a modified total length field.

Affected configurations

Nvd

Node

mdtscn-ip000.03_firmwareRange<3.0.4

AND

mdtscn-ip000.03Match-

Node

mdtscn-ip100.03_firmwareRange<3.0.4

AND

mdtscn-ip100.03Match-

VendorProductVersionCPE
mdtscn-ip000.03_firmware*cpe:2.3:o:mdt:scn-ip000.03_firmware:*:*:*:*:*:*:*:*
mdtscn-ip000.03-cpe:2.3:h:mdt:scn-ip000.03:-:*:*:*:*:*:*:*
mdtscn-ip100.03_firmware*cpe:2.3:o:mdt:scn-ip100.03_firmware:*:*:*:*:*:*:*:*
mdtscn-ip100.03-cpe:2.3:h:mdt:scn-ip100.03:-:*:*:*:*:*:*:*

Vendor	Product	Version	CPE
mdt	scn-ip000.03_firmware	*	cpe:2.3:o:mdt:scn-ip000.03_firmware::::::::
mdt	scn-ip000.03	-	cpe:2.3:h:mdt:scn-ip000.03:-:::::::*
mdt	scn-ip100.03_firmware	*	cpe:2.3:o:mdt:scn-ip100.03_firmware::::::::
mdt	scn-ip100.03	-	cpe:2.3:h:mdt:scn-ip100.03:-:::::::*

References

github.com/robertguetzkow/CVE-2021-37740

www.mdt.de/download/MDT_CL_SCN_IP_03_IP_Interface_Router.pdf

www.mdt.de/EN_IP_Interface_Router.html

CVSS2

7.8

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

COMPLETE

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

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

0.005

Percentile

77.1%

JSON

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