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No exploitation reportedFix available

CVE-2022-31803

No exploitation reported by the sources we read.

  • Published2022-06-24
  • Fixed in2.3.9.38
  • WeaknessCWE-400

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

In CODESYS Gateway Server V2 an insufficient check for the activity of TCP client connections allows an unauthenticated attacker to consume all available TCP connections and prevent legitimate users or clients from establishing a new connection to the CODESYS Gateway Server V2. Existing connections are not affected and therefore remain intact.

Timeline

dates in UTC
  1. 2022-06-2408:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2022-31803?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2022-31803?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Codesys gateway
BranchAffectedFixed in
2.x≥ 2.0, < 2.3.9.382.3.9.38

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • ICSA-25-182-03 CISA1 known affected

    FESTO CODESYS

    CODESYS provided by Festo all versions

Full record on NVD

Fix

  1. Update Codesys gateway to 2.3.9.38
  2. Mitigation from the vendor CISA ICSA-25-182-03 · 1 productEnable password protection at login in case no password is set at the controller. Please note that the password configuration file is not covered by the default FFT backup and restore mechanism. You must select the related file manually.

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • CNACVSS 3.15.3read 2026-10-23
  • NVDCVSS 2.05read 2026-10-23
  • CNAweakness (CWE)CWE-400read 2026-10-23
  • FIRST EPSSEPSS score1.2 %2026-10-23

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Published
2022-06-24
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2022-31803?

In CODESYS Gateway Server V2 an insufficient check for the activity of TCP client connections allows an unauthenticated attacker to consume all available TCP connections and prevent legitimate users or clients from establishing a new connection to the CODESYS Gateway Server V2. Existing connections are not affected and therefore remain intact.

Is CVE-2022-31803 actively exploited?

Active exploitation of CVE-2022-31803 has not been confirmed. Its EPSS score was 1.2% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2022-31803?

CVE-2022-31803 has a CVSS v3 base score of 5.3 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

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