How severe is CVE-2021-43575?

CVE-2021-43575 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-43575 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-43575?

CVE-2021-43575 affects Knx Engineering Tool Software 6. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-43575?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-43575 published?

CVE-2021-43575 was published on 2021-11-09 and last updated on 2026-06-17.

CVE-2021-43575

CVE-2021-43575 is a medium-severity vulnerability in Knx Engineering Tool Software 6 with a CVSS 3.x base score of 5.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-798.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
CVSS v2: 2.1
EPSS exploit prediction: 0% (23rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-798
Affected product: Knx Engineering Tool Software 6
Published: 2021-11-09
Last modified: 2026-06-17

Description

KNX ETS6 through 6.0.0 uses the hard-coded password ETS5Password, with a salt value of Ivan Medvedev, allowing local users to read project information, a similar issue to CVE-2021-36799. NOTE: The vendor disputes this because it is not the responsibility of the ETS to securely store cryptographic key material when it is not being exported

Frequently asked questions

What is CVE-2021-43575?: KNX ETS6 through 6.0.0 uses the hard-coded password ETS5Password, with a salt value of Ivan Medvedev, allowing local users to read project information, a similar issue to CVE-2021-36799. NOTE: The vendor disputes this because it is not the responsibility of the ETS to securely store cryptographic key material when it is not being exported
How severe is CVE-2021-43575?: CVE-2021-43575 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-43575 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-43575?: CVE-2021-43575 affects Knx Engineering Tool Software 6. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-43575?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-43575 published?: CVE-2021-43575 was published on 2021-11-09 and last updated on 2026-06-17.

References

https://github.com/robertguetzkow/ets5-password-recovery

Affected products (1)

cpe:2.3:a:knx:engineering_tool_software_6:6.0.0:*:*:*:*:*:*:*

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