High severity7.5NVD Advisory· Published Apr 20, 2022· Updated Jun 17, 2026

CVE-2021-37740

Description

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

MDT/Scn Ip000.03 Firmware
cpe:2.3:o:mdt:scn-ip000.03_firmware:*:*:*:*:*:*:*:*
Range: <3.0.4
MDT/Scn Ip100.03 Firmware
cpe:2.3:o:mdt:scn-ip100.03_firmware:*:*:*:*:*:*:*:*
Range: <3.0.4
MDT/KNXnet/IP Secure router SCN-IP100.03 and KNX IP interface SCN-IP000.03description
MDT/KNXnet/IP Secure router SCN-IP100.03llm-create
Range: <3.0.4
MDT/KNX IP interface SCN-IP000.03llm-create
Range: <3.0.4

Patches

Vulnerability mechanics

References

www.mdt.de/download/MDT_CL_SCN_IP_03_IP_Interface_Router.pdfnvdRelease NotesVendor Advisory
www.mdt.de/EN_IP_Interface_Router.htmlnvdBroken Link

News mentions

No linked articles in our index yet.

cvss	0.488
epss	0.004
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000