CVE-2022-31804: The CODESYS Gateway Server V2 does not verifiy that the size of a request is within expected limits

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HIGH 7.5REMOTEUPGRADE

CVE-2022-31804 is a high-severity flaw (CVSS 7.5) affecting gateway. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The CODESYS Gateway Server V2 does not verifiy that the size of a request is within expected limits. An unauthenticated attacker may allocate an arbitrary amount of memory, which may lead to a crash of the Gateway due to an out-of-memory condition.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.2% (top 33%)
CISA exploited list	No
Weakness	CWE-789
Published	2022-06-24
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

2022-06-24 08:15 UTCPublished CVE record published
2026-06-17 04:46 UTCUpdated Record last modified

codesys gateway UPGRADE

Affected: >= 2.0 and < 2.3.9.38

Fixed in: 2.3.9.38

Safe to downgrade to: a release before 2.0

1. Check installed version

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

2. UPGRADE to 2.3.9.38 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade gateway

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 2.0 (Debian / Ubuntu)

apt-cache madison gateway sudo apt install gateway=<VERSION_BEFORE_2.0> sudo apt-mark hold gateway

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

dnf --showduplicates list gateway sudo dnf downgrade gateway-<VERSION_BEFORE_2.0> sudo dnf versionlock add gateway

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-2022-31804?

gateway: upgrade to 2.3.9.38. Exact commands for each OS are on this page.

Is CVE-2022-31804 being exploited?

CVE-2022-31804 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-2022-31804 affect?

CVE-2022-31804 affects gateway. Severity is high (CVSS 7.5). The CODESYS Gateway Server V2 does not verifiy that the size of a request is within expected limits. An unauthenticated attacker may allocate an arbitrary amount of memory, which may lead to a crash of the Gateway due to an out-of-memory co

How urgent is CVE-2022-31804?

Priority 48/100. High severity; Remotely exploitable, no login, no user action

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References

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