Is CVE-2021-37740 in the CISA KEV catalog?

No. CVE-2021-37740 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-37740?

CVE-2021-37740 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2021-37740?

CVE-2021-37740 has an EPSS score of 4.57% (90th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-37740?

Upgrade scn-ip000.03 firmware to 3.0.4 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2021-37740

HIGHEPSS 90th pctl

7.5

CVSS v3

NVD

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.

How to fix

Remediation Available

scn-ip000.03 firmwareNVD

Affected:< 3.0.4Fixed in:3.0.4CVE-2021-37740derived from NVD

scn-ip100.03 firmwareNVD

Affected:< 3.0.4Fixed in:3.0.4CVE-2021-37740derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

4.57%probability of exploitation in 30 days

90thpercentile

High risk: more likely to be exploited than 90% of all known CVEs.

References

Exploit1

github.com

Vendor Advisory1

mdt.de

Other references1

mdt.de

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.