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CVE-2021-37740

HIGH
7.5
CVSS Score
Published: April 20, 2022 at 07:31 PM UTC
Updated: June 17, 2026 at 04:01 AM UTC
4 products affected across 1 vendorScn Ip100.03 FirmwareScn Ip000.03 FirmwareScn-Ip000.03

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Severity
HIGH7.5
Exploit prediction
EPSS 5%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Scn Ip000.03 Firmware· Mdt
95%
v < 3.0.4
Affected range stops below 3.0.4, so it looks safe — our inference, not a vendor statement
mdt-scn-ip000-03 (same device)
Scn Ip100.03 Firmware· Mdt
95%
v < 3.0.4
Affected range stops below 3.0.4, so it looks safe — our inference, not a vendor statement
mdt-scn-ip100-03 (same device)
Scn-Ip000.03· Mdtdevice
80%
All versions
Scn-Ip100.03· Mdtdevice
80%
All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

x_refsource_MISCExploitRelease NotesThird Party Advisory
Source: [email protected]
https://github.com/robertguetzkow/CVE-2021-37740
x_refsource_MISCBroken Link
Source: [email protected]
https://www.mdt.de/EN_IP_Interface_Router.html
x_refsource_MISCRelease NotesVendor Advisory
Source: [email protected]
https://www.mdt.de/download/MDT_CL_SCN_IP_03_IP_Interface_Router.pdf

CVSS

7.5HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
NVD-CWE-noinfo

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