CVE-2023-3669: A missing Brute-Force protection in CODESYS Development System prior to 3.5.19.20 allows a local attacker to h

Q: How do I fix CVE-2023-3669?

development system: upgrade to 3.5.19.20. Exact commands for each OS are on this page.

Q: Is CVE-2023-3669 being exploited?

CVE-2023-3669 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-2023-3669 affect?

CVE-2023-3669 affects development system. Severity is low (CVSS 3.3). A missing Brute-Force protection in CODESYS Development System prior to 3.5.19.20 allows a local attacker to have unlimited attempts of guessing the password within an import dialog.

Q: How urgent is CVE-2023-3669?

Priority 13/100. No elevated risk signals yet.

Routine

LOW 3.3UPGRADE

CVE-2023-3669 is a low-severity flaw (CVSS 3.3) affecting development system. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A missing Brute-Force protection in CODESYS Development System prior to 3.5.19.20 allows a local attacker to have unlimited attempts of guessing the password within an import dialog.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	3.3 (Low)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.1% (top 96%)
CISA exploited list	No
Weakness	CWE-307
Published	2023-08-03
Last modified	2026-06-17

Publisher (CNA): CERT VDE · Vendor: codesys

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

Am I affected?

Timeline

2023-08-03 12:15 UTCPublished CVE record published
2026-06-17 06:14 UTCUpdated Record last modified

codesys development system UPGRADE

Affected: < 3.5.19.20

Fixed in: 3.5.19.20

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy development-system || rpm -q development-system || development-system --version

2. UPGRADE to 3.5.19.20 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade development-system

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade development-system

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-2023-3669?

development system: upgrade to 3.5.19.20. Exact commands for each OS are on this page.

Is CVE-2023-3669 being exploited?

CVE-2023-3669 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-2023-3669 affect?

CVE-2023-3669 affects development system. Severity is low (CVSS 3.3). A missing Brute-Force protection in CODESYS Development System prior to 3.5.19.20 allows a local attacker to have unlimited attempts of guessing the password within an import dialog.

How urgent is CVE-2023-3669?

Priority 13/100. No elevated risk signals yet.

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References

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