CVE-2021-37740

7.5 highEPSS 4.6%

High (7.5) in mdt. EPSS 4.6% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

7.5 high

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

EPSS: 4.6% chance of exploitation in the next 30 days; higher than 91% of CVEs (scores of 2026-10-31)
Published: 2022-04-20
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

mdt:scn-ip000.03_firmware
mdt:scn-ip100.03_firmware

References

https://github.com/robertguetzkow/CVE-2021-37740
https://www.mdt.de/EN_IP_Interface_Router.html
https://www.mdt.de/download/MDT_CL_SCN_IP_03_IP_Interface_Router.pdf
https://github.com/robertguetzkow/CVE-2021-37740
https://www.mdt.de/EN_IP_Interface_Router.html

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