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PatchSiren cyber security CVE debrief

CVE-2022-31804 CODESYS CVE debrief

CVE-2022-31804 is a network-exploitable denial-of-service issue in CODESYS Gateway Server V2 used by FESTO's "CODESYS provided by Festo" software. The gateway does not verify that request size stays within expected limits, so an unauthenticated attacker can force arbitrary memory allocation and potentially crash the service through out-of-memory exhaustion. The supplied CVSS vector is AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H, so the main risk is availability loss rather than confidentiality or integrity impact.

Vendor
CODESYS
Product
Software
CVSS
HIGH 7.5
CISA KEV
Not listed in stored evidence
Original CVE published
2024-12-03
Original CVE updated
2024-12-03
Advisory published
2024-12-03
Advisory updated
2024-12-03

Who should care

OT/ICS operators using FESTO CODESYS provided by Festo, especially teams responsible for exposed gateway services, controller access controls, network segmentation, and availability monitoring.

Technical summary

The advisory describes an input validation failure in CODESYS Gateway Server V2: request sizes are not checked against expected bounds. Because the issue is unauthenticated and network reachable, a remote attacker can send oversized requests that drive memory allocation until the gateway runs out of memory and crashes. The affected product listing in the supplied CSAF marks "CODESYS provided by Festo all versions" as impacted.

Defensive priority

High: the flaw is unauthenticated, remotely reachable, and can take down an industrial gateway service by exhausting memory, which can disrupt OT operations.

Recommended defensive actions

  • Review the FESTO/CISA advisory for CODESYS provided by Festo and confirm whether any vendor updates or hardening guidance apply in your environment.
  • Enable password protection at login if no controller password is set; the supplied remediation notes that the password configuration file is not included in the default FFT backup and restore process and must be selected
  • manually.
  • Limit exposure of the Gateway Server V2 to trusted networks only and follow CISA ICS recommended practices for segmentation and defense in depth.
  • Inventory all deployments of "CODESYS provided by Festo" and verify whether any affected gateway services are reachable from untrusted networks.
  • Monitor gateway availability and memory usage for signs of abnormal request-driven exhaustion or service restarts.

Evidence notes

Based on the supplied CISA CSAF advisory ICSA-25-182-03 for FESTO, which lists "CODESYS provided by Festo all versions" as affected and describes the lack of request-size validation leading to unauthenticated memory exhaustion and crash. The remediation entry explicitly recommends enabling password protection at login when no controller password is configured. The supplied enrichment shows no KEV entry and no ransomware campaign use. The advisory revision history includes a same-day reference correction.

Sources and references

Verified primary and authoritative sources

  • CVE-2022-31804 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2022-31804

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2022-31804 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2022-31804

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2025/icsa-25-182-03.json

    cisa_csaf

  • Source reference

    Unverified legacy reference

    URL: https://festo.csaf-tp.certvde.com/.well-known/csaf/white/2024/fsa-202406.json

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://certvde.com/en/advisories/vendor/festo/

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://festo.com/psirt

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://certvde.com/en/advisories/VDE-2024-059

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/ics-advisories/icsa-25-182-03

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/uscert/ics/alerts/ICS-ALERT-10-301-01

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/resources-tools/resources/ics-recommended-practices

    Reference

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.