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PatchSiren cyber security CVE debrief

CVE-2023-39810 Siemens CVE debrief

CVE-2023-39810 is a medium-severity Siemens OT issue rooted in BusyBox CPIO handling. On affected SINEC OS firmware, a crafted archive can enable directory traversal, so operators should prioritize the vendor firmware update and review any workflows that process untrusted archives.

Vendor
Siemens
Product
RUGGEDCOM RST2428P (6GK6242-6PA00)
CVSS
MEDIUM 6.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-01-28
Original CVE updated
2026-02-25
Advisory published
2026-01-28
Advisory updated
2026-02-25

Who should care

Siemens SINEC OS administrators, OT security teams, and maintenance personnel responsible for the listed RUGGEDCOM and SCALANCE devices should review this advisory and confirm whether their firmware is affected.

Technical summary

The source advisory attributes CVE-2023-39810 to BusyBox v1.33.2 CPIO processing, where archive handling can permit directory traversal. The supplied CVSS vector is CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:L, which indicates a local attack path requiring user interaction and with primary integrity impact. CISA’s republication history also notes a clarification that only SINEC OS firmware is impacted across the listed Siemens products.

Defensive priority

Medium

Recommended defensive actions

  • Update affected Siemens products to SINEC OS firmware V3.3 or later using Siemens ProductCERT guidance.
  • Inventory the listed Siemens device models and verify which firmware versions are actually deployed before scheduling maintenance.
  • Review any local file import, archive extraction, or service workflows that could expose BusyBox CPIO processing to untrusted content.
  • Apply ICS defense-in-depth controls on engineering and maintenance access paths, including least privilege and strong account separation.
  • Track Siemens advisory SSA-089022 and CISA ICSA-26-043-06 for any follow-on clarifications or product mapping updates.

Evidence notes

This debrief is based on the supplied CISA CSAF republication of Siemens ProductCERT advisory SSA-089022 (ICSA-26-043-06). The source description states: 'An issue in the CPIO command of Busybox v1.33.2 allows attackers to execute a directory traversal.' The embedded revision history shows initial publication on 2026-01-28, a 2026-02-24 update that clarified only SINEC OS firmware is impacted, and a 2026-02-25 latest republication. The remediation field directs affected products to V3.3 or later.

Sources and references

Verified primary and authoritative sources

  • CVE-2023-39810 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2023-39810

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

  • CVE-2023-39810 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2023-39810

    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/2026/icsa-26-043-06.json

    cisa_csaf

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/csaf/ssa-089022.json

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/html/ssa-089022.html

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/ics-advisories/icsa-26-043-06

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/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://www.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.