CVE-2021-37740

Public Exploit

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.

7.5

CVSS

Severity: High

CVSS 3.1 •

CVSS 2.0 •

EPSS 13.06% Top 10%

Vendor Advisory mdt.de

Affected: n/a n/a

References

Link	Tags
https://www.mdt.de/EN_IP_Interface_Router.html	broken link
https://www.mdt.de/download/MDT_CL_SCN_IP_03_IP_Interface_Router.pdf	release notes vendor advisory
https://github.com/robertguetzkow/CVE-2021-37740	release notes exploit third party advisory

Frequently Asked Questions

What is the severity of CVE-2021-37740?: CVE-2021-37740 has been scored as a high severity vulnerability.
How to fix CVE-2021-37740?: To fix CVE-2021-37740, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-37740 being actively exploited in the wild?: It is possible that CVE-2021-37740 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~13% probability that this vulnerability will be exploited by malicious actors in the next 30 days.

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