CVE-2023-3662: In CODESYS Development System versions from 3.5.17.0 and prior to 3.5.19.20 a vulnerability allows for executi

Routine

HIGH 7.3UPGRADE

CVE-2023-3662 is a high-severity flaw (CVSS 7.3) affecting development system. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In CODESYS Development System versions from 3.5.17.0 and prior to 3.5.19.20 a vulnerability allows for execution of binaries from the current working directory in the users context .

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 89%)
CISA exploited list	No
Weakness	CWE-427
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 11:15 UTCPublished CVE record published
2026-06-17 06:14 UTCUpdated Record last modified

codesys development system UPGRADE

Affected: >= 3.5.17.0 and < 3.5.19.20

Fixed in: 3.5.19.20

Safe to downgrade to: a release before 3.5.17.0

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.

3. If no update is available yet, DOWNGRADE to a release before 3.5.17.0 (Debian / Ubuntu)

apt-cache madison development-system sudo apt install development-system=<VERSION_BEFORE_3.5.17.0> 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_3.5.17.0> 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.

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-2023-3662?

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

Is CVE-2023-3662 being exploited?

CVE-2023-3662 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-2023-3662 affect?

CVE-2023-3662 affects development system. Severity is high (CVSS 7.3). In CODESYS Development System versions from 3.5.17.0 and prior to 3.5.19.20 a vulnerability allows for execution of binaries from the current working directory in the users context .

How urgent is CVE-2023-3662?

Priority 28/100. High severity

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References

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