CVE-2021-36799

HIGH

KNX ETS5 < 5.7.6 - Use of Hard-coded Credentials

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2021-36799. PoCs published by robertguetzkow.

AI-analyzed exploit summary This repository contains a functional password recovery tool for ETS5 (KNX ETS5) projects, exploiting a vulnerability (CVE-2021-36799) to extract obfuscated passwords from configuration files. The tool parses XML-based project files and deobfuscates stored credentials.

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

Exploits (1)

nomisec WORKING POC 33 stars
by robertguetzkow · poc
https://github.com/robertguetzkow/ets5-password-recovery

This repository contains a functional password recovery tool for ETS5 (KNX ETS5) projects, exploiting a vulnerability (CVE-2021-36799) to extract obfuscated passwords from configuration files. The tool parses XML-based project files and deobfuscates stored credentials.

Classification
Working Poc 95%
Attack Type
Info Leak
Complexity
Moderate
Reliability
Reliable
Target: KNX ETS5 (Engineering Tool Software 5)
No auth needed
Prerequisites: Access to ETS5 project files (.knxproj or related XML configs)
devstral-2 · analyzed Feb 18, 2026 Full analysis →

References (3)

Core 3
Core References
Third Party Advisory x_refsource_misc
https://github.com/robertguetzkow/ets5-password-recovery
Third Party Advisory, VDB Entry x_refsource_misc
http://packetstormsecurity.com/files/165200/ETS5-Password-Recovery-Tool.html

Scores

CVSS v3 8.8
EPSS 0.0042
EPSS Percentile 33.5%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Details

CWE
CWE-798
Status published
Products (1)
knx/engineering_tool_software_5 < 5.7.6
Published Jul 19, 2021
Tracked Since Feb 18, 2026