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PatchSiren cyber security CVE debrief

CVE-2022-31802 CODESYS CVE debrief

CVE-2022-31802 is a critical authentication bypass affecting CODESYS Gateway Server V2 in Festo-related software. According to the supplied CSAF description, versions prior to V2.3.9.38 compare only part of the provided password against the real gateway password, which can let an attacker authenticate with a shorter password that matches the compared portion. The result is a network-reachable, unauthenticated path to login with high impact to confidentiality, integrity, and availability.

Vendor
CODESYS
Product
Software
CVSS
CRITICAL 9.8
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, plant engineering teams, and administrators running CODESYS provided by Festo or CODESYS Gateway Server V2 should treat this as urgent. Security teams responsible for industrial gateways, remote access paths, and controller authentication should also verify exposure and patch status.

Technical summary

The supplied advisory describes a logic flaw in password verification: only part of the submitted password is checked against the stored gateway password. Because the CVSS vector is AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H, the issue is remotely reachable, requires no privileges or user interaction, and can lead to full compromise of the affected service. The source identifies affected versions as those prior to V2.3.9.38 and provides a mitigation to enable password protection at login when no controller password is set.

Defensive priority

Immediate

Recommended defensive actions

  • Identify any deployment of CODESYS Gateway Server V2 or CODESYS provided by Festo in the environment.
  • Upgrade affected installations to a version at or above V2.3.9.38.
  • Enable password protection at login if no password is set at the controller.
  • Manually include the password configuration file in backup and restore workflows, since the default FFT backup and restore mechanism does not cover it.
  • Restrict network access to industrial gateway services and monitor for unusual authentication activity.

Evidence notes

The CSAF source item (ICSA-25-182-03) states that versions prior to V2.3.9.38 compare only part of the specified password to the real CODESYS Gateway password. The same source assigns CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H and lists a mitigation about enabling password protection at login. The supplied revision history shows the advisory was initially published on 2024-12-03 and then corrected the same day to fix one reference.

Sources and references

Verified primary and authoritative sources

  • CVE-2022-31802 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2022-31802

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

  • CVE-2022-31802 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2022-31802

    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.