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PatchSiren cyber security CVE debrief

CVE-2024-23815 Siemens CVE debrief

CVE-2024-23815 affects Siemens Desigo CC. The advisory states that the server application fails to authenticate specific client requests, and that a modified client binary could let an unauthenticated remote attacker execute arbitrary SQL queries against the server database over the event port (default 4998/tcp). In environments where Installed Client access is limited to highly protected zones, the vendor notes exploitation also depends on gaining access to an Installed Client in that zone and bypassing Desigo CC hardening guidance.

Vendor
Siemens
Product
Desigo CC
CVSS
HIGH 7.5
CISA KEV
Not listed in stored evidence
Original CVE published
2025-05-13
Original CVE updated
2025-05-13
Advisory published
2025-05-13
Advisory updated
2025-05-13

Who should care

OT/ICS defenders and administrators running Siemens Desigo CC, especially teams responsible for network segmentation, the event port, and Installed Client deployment.

Technical summary

This issue is an authentication failure on the server side for specific client requests. Per the advisory, it can be abused through the event port to issue arbitrary SQL queries against the backend database. Exposure is highest where the event port is reachable from untrusted networks or where Installed Client hardening and zone restrictions are not enforced.

Defensive priority

High for any exposed Desigo CC deployment; lower only where access is tightly segmented and Installed Client support is disabled per vendor guidance.

Recommended defensive actions

  • Restrict access to the server's event port (default: 4998/tcp) to trusted systems only.
  • On the Desigo CC server, disable support for Installed Clients.
  • Verify that access from Installed Clients is limited to highly protected zones and that the vendor hardening guidance is enforced.
  • Review and apply Siemens cybersecurity guidance and CISA ICS recommended practices for defense-in-depth and segmentation.
  • Inventory Desigo CC deployments to confirm whether the event port is exposed outside the intended OT trust boundary.

Evidence notes

Source corpus is the CISA CSAF advisory ICSA-25-135-04 (published 2025-05-13) and Siemens advisory SSA-523418. The corpus explicitly states the authentication failure, the default event port 4998/tcp, the mitigations to restrict port access and disable Installed Client support, and the added zone/hardening caveat. No affected version range, fixed release, or KEV entry is supplied in the corpus.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-23815 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-23815

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

  • CVE-2024-23815 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-23815

    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-25-135-04.json

    cisa_csaf

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/csaf/ssa-523418.json

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/html/ssa-523418.html

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/ics-advisories/icsa-25-135-04

    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

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/topics/industrial-control-systems

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://us-cert.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf

    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.