CVE-2023-3670: In CODESYS Development System 3.5.9.0 to 3.5.17.0 and CODESYS Scripting 4.0.0.0 to 4.1.0.0 unsafe directory pe

Routine

HIGH 7.3UPGRADEUPGRADE

CVE-2023-3670 is a high-severity flaw (CVSS 7.3) affecting development system, scripting. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In CODESYS Development System 3.5.9.0 to 3.5.17.0 and CODESYS Scripting 4.0.0.0 to 4.1.0.0 unsafe directory permissions would allow an attacker with local access to the workstation to place potentially harmful and disguised scripts that could be executed by legitimate users.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.3 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.2% (top 90%)
CISA exploited list	No
Weakness	CWE-668
Published	2023-07-28
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

2023-07-28 08:15 UTCPublished CVE record published
2026-06-17 06:14 UTCUpdated Record last modified

codesys development system UPGRADE

Affected: >= 3.5.9.0 and < 3.5.17.0

Fixed in: 3.5.17.0

Safe to downgrade to: a release before 3.5.9.0

1. Check installed version

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

2. UPGRADE to 3.5.17.0 (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.

3. If no update is available yet, DOWNGRADE to a release before 3.5.9.0 (Debian / Ubuntu)

apt-cache madison development-system sudo apt install development-system=<VERSION_BEFORE_3.5.9.0> sudo apt-mark hold development-system

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list development-system sudo dnf downgrade development-system-<VERSION_BEFORE_3.5.9.0> sudo dnf versionlock add development-system

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

codesys scripting UPGRADE

Affected: >= 4.0.0.0 and < 4.1.0.0

Fixed in: 4.1.0.0

Safe to downgrade to: a release before 4.0.0.0

1. Check installed version

apt-cache policy scripting || rpm -q scripting || scripting --version

2. UPGRADE to 4.1.0.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade scripting

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade scripting

Note

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

3. If no update is available yet, DOWNGRADE to a release before 4.0.0.0 (Debian / Ubuntu)

apt-cache madison scripting sudo apt install scripting=<VERSION_BEFORE_4.0.0.0> sudo apt-mark hold scripting

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list scripting sudo dnf downgrade scripting-<VERSION_BEFORE_4.0.0.0> sudo dnf versionlock add scripting

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2023-3670?

development system: upgrade to 3.5.17.0; scripting: upgrade to 4.1.0.0. Exact commands for each OS are on this page.

Is CVE-2023-3670 being exploited?

CVE-2023-3670 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-2023-3670 affect?

CVE-2023-3670 affects development system, scripting. Severity is high (CVSS 7.3). In CODESYS Development System 3.5.9.0 to 3.5.17.0 and CODESYS Scripting 4.0.0.0 to 4.1.0.0 unsafe directory permissions would allow an attacker with local access to the workstation to place potentially harmful and disguised scripts that cou

How urgent is CVE-2023-3670?

Priority 28/100. High severity

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References

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