CVE-2021-37740

moderate-risk
Published 2022-04-20

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.

Do I need to act?

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20.0% chance of exploitation in next 30 days
EPSS score — higher than 80% of all CVEs
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
7
CVSS 7.5/10 High
NETWORK / LOW complexity

Affected Products (2)

Affected Vendors

Mdt

References (6)

Exploit https://github.com/robertguetzkow/CVE-2021-37740
Broken Link https://www.mdt.de/EN_IP_Interface_Router.html
Release Notes https://www.mdt.de/download/MDT_CL_SCN_IP_03_IP_Interface_Router.pdf
Exploit https://github.com/robertguetzkow/CVE-2021-37740
Broken Link https://www.mdt.de/EN_IP_Interface_Router.html
Release Notes https://www.mdt.de/download/MDT_CL_SCN_IP_03_IP_Interface_Router.pdf
47
/ 100
moderate-risk
Severity 26/34 · High
Exploitability 14/34 · Moderate
Exposure 7/34 · Low