CVE-2021-37740: Mdt Scn-IP000.03 Firmware

High severity, CVSS 7.5. 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.

Affected products

• Mdt Scn-IP000.03 Firmware: before 3.0.4 (fixed in 3.0.4)
• Mdt Scn-IP100.03 Firmware: before 3.0.4 (fixed in 3.0.4)

Published 2022-04-20. Last modified 2026-06-17.