CVE-2021-36799Public exploit

Project secret disclosure via hard-coded encryption credentials

Published Jul 19, 2021 · Updated Aug 4, 2024

Hard-coded credentials in KNX Association ETS5 through 5.7.6 allow local users to read sensitive data from local project files. The project store encrypts sensitive XML attributes with AES-256-CBC using a key and IV derived from the constant password ETS5Password and salt Ivan Medvedev instead of the project password. Any unprivileged account able to read C:\ProgramData\KNX\ETS5\ProjectStore can decrypt device keys and passwords used to secure the associated KNX installation.

CVSS severity8.8
High
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Hard-coded credentials in KNX Association ETS5 through 5.7.6 allow local users to read sensitive data from local project files. The project store encrypts sensitive XML attributes with AES-256-CBC using a key and IV derived from the constant password ETS5Password and salt Ivan Medvedev instead of the project password. Any unprivileged account able to read C:\ProgramData\KNX\ETS5\ProjectStore can decrypt device keys and passwords used to secure the associated KNX installation.

The record

CVE
CVE-2021-36799
Published
Jul 19, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-798, T1552.001
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 19, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
2.1NIST NVDAV:L/AC:L/Au:N/C:P/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-798Use of Hard-coded Credentials
T1552.001Credentials In Files

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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