CVE-2021-36799: KNX ETS5 through 5.7.6 uses the hard-coded password ETS5Password, with a salt value of Ivan Medvedev, allowing

Q: How do I fix CVE-2021-36799?

engineering tool software 5: upgrade to newer than 5.7.6. Exact commands for each OS are on this page.

Q: Is CVE-2021-36799 being exploited?

CVE-2021-36799 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-36799 affect?

CVE-2021-36799 affects engineering tool software 5. Severity is high (CVSS 8.8). 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 maint

This month

HIGH 8.8UPGRADE

CVE-2021-36799 is a high-severity flaw (CVSS 8.8) affecting engineering tool software 5. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 64%)
CISA exploited list	No
Weakness	CWE-798
Published	2021-07-19
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: knx

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-07-19 17:15 UTCPublished CVE record published
2026-06-17 03:59 UTCUpdated Record last modified

knx engineering tool software 5 UPGRADE

Affected: <= 5.7.6

Fixed in: newer than 5.7.6

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy engineering-tool-software-5 || rpm -q engineering-tool-software-5 || engineering-tool-software-5 --version

2. UPGRADE to newer than 5.7.6 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade engineering-tool-software-5

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade engineering-tool-software-5

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-36799?

engineering tool software 5: upgrade to newer than 5.7.6. Exact commands for each OS are on this page.

Is CVE-2021-36799 being exploited?

CVE-2021-36799 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-36799 affect?

CVE-2021-36799 affects engineering tool software 5. Severity is high (CVSS 8.8). 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 maint

How urgent is CVE-2021-36799?

Priority 40/100. High severity

References

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