CVE-2021-36799

Name: CVE-2021-36799
Creator: NVD / NIST
Published: 2021-07-19T17:15:11.92+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 0.42%

Last modified Jun 17, 2026

CVE-2021-36799 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. KNX ETS5 through 5.7.6 uses the hard-coded password ETS5Password, with a salt value of Ivan Medvedev, allowing local users to read project information. NOTE: This vulnerability only affects products that are no longer supported by the maintainer. EPSS estimates a 0.42% chance of exploitation in the next 30 days.

Description

KNX ETS5 through 5.7.6 uses the hard-coded password ETS5Password, with a salt value of Ivan Medvedev, allowing local users to read project information. NOTE: This vulnerability only affects products that are no longer supported by the maintainer

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

0.42%

33.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-798

Affected Software

Vendor	Product	Versions
Knx	Engineering Tool Software 5	<= 5.7.6

References

http://packetstormsecurity.com/files/165200/ETS5-Password-Recovery-Tool.htmlThird Party Advisory, VDB Entry
https://github.com/robertguetzkow/ets5-password-recoveryThird Party Advisory
https://www.knx.org/knx-en/for-professionals/software/ets-5-professional/Product, Vendor Advisory
http://packetstormsecurity.com/files/165200/ETS5-Password-Recovery-Tool.htmlThird Party Advisory, VDB Entry
https://github.com/robertguetzkow/ets5-password-recoveryThird Party Advisory
https://www.knx.org/knx-en/for-professionals/software/ets-5-professional/Product, Vendor Advisory

Timeline

Published: Jul 19, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-36799?

How severe is CVE-2021-36799?

CVE-2021-36799 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.42% probability of exploitation in the next 30 days.

How do I fix CVE-2021-36799?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-36799?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST