PatchSiren

PatchSiren cyber security CVE debrief

CVE-2025-26390 Siemens CVE debrief

CVE-2025-26390 is a critical SQL injection affecting the web service authentication check in Siemens OZW672 and OZW772 devices. According to the CISA CSAF advisory and Siemens references, an unauthenticated remote attacker could bypass the check and authenticate as Administrator. Siemens provides a fix in version V6.0 or later for the affected products.

Vendor
Siemens
Product
OZW672
CVSS
CRITICAL 9.8
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

Operators and administrators of Siemens OZW672 and OZW772 devices, OT/ICS security teams, and anyone responsible for monitoring or hardening Siemens web-facing control infrastructure.

Technical summary

The advisory describes SQL injection in the web service used to check authentication data on affected Siemens OZW devices. The impact is authentication bypass, allowing an unauthenticated remote attacker to obtain Administrator access. The supplied CVSS vector is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H (9.8 Critical), indicating remote, low-complexity exploitation with high confidentiality, integrity, and availability impact. The affected product set in the supplied source data is Siemens OZW672 and OZW772, with remediation to update to V6.0 or later.

Defensive priority

Immediate

Recommended defensive actions

  • Update Siemens OZW672 and OZW772 devices to V6.0 or later using the vendor remediation links in the advisory.
  • Review exposure of the affected web service and restrict access to trusted management networks where feasible.
  • Monitor for abnormal authentication activity or unexpected Administrator logins on affected devices.
  • Apply CISA and ICS defense-in-depth guidance for segmentation, access control, and monitoring in OT environments.
  • Validate that asset inventories include OZW672 and OZW772 so patching can be confirmed and tracked.

Evidence notes

This debrief is based only on the supplied CISA CSAF source item ICSA-25-135-10, its Siemens references, and the provided CVE metadata. The source text states the issue is SQL injection during authentication checking and that a remote unauthenticated attacker could bypass authentication and become Administrator. The supplied remediation is to update to V6.0 or later for both affected products. No KEV entry was provided in the enrichment data.

Sources and references

Verified primary and authoritative sources

  • CVE-2025-26390 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2025-26390

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

  • CVE-2025-26390 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2025-26390

    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-25-135-10.json

    cisa_csaf

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/csaf/ssa-047424.json

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/html/ssa-047424.html

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/ics-advisories/icsa-25-135-10

    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.