Republished vendor advisory. This ICSA is a verbatim republication of Siemens ProductCERT SSA-177847 from a direct conversion of the vendor's Common Security Advisory Framework (CSAF) advisory. This is republished to CISA's website as a means of increasing visibility and is provided "as-is" for informational purposes only. CISA is not responsible for the editorial or technical accuracy of republished advisories and provides no warranties of any kind regarding any information contained within this advisory. Further, CISA…
General Recommendations: As a general security measure, Siemens strongly recommends to protect network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends to configure the environment according to Siemens' operational guidelines for Industrial Security (Download: https://www.siemens.com/cert/operational-guidelines-industrial-security), and to follow the recommendations in the product manuals. Additional information on Industrial Security by Siemens can be found at: https://www.siemens.com/industrialsecurity
Additional Resources: For further inquiries on security vulnerabilities in Siemens products and solutions, please contact the Siemens ProductCERT: https://www.siemens.com/cert/advisories
Credit: Siemens ProductCERT
From CISA's machine-readable CSAF 2.0 advisory (JSON).
| CVE | Weakness | CVSS v3 | Details |
|---|---|---|---|
| CVE-2025-40743 | CWE-288 Authentication Bypass Using an Alternate Path or Channel | 8.3 High |
CVE-2025-40743 The affected application improperly validates authentication for its VNC access service, allowing access with insufficient password verification. This could allow an attacker to gain unauthorized remote access and potentially compromise system confidentiality, integrity, or availability. Mitigation: Apply Defense-in-Depth Mitigation: Close VNC port on X130 via HMI setting Mitigation: Set VNC Password on X120 and X130 Affected, fixed & timelineAffected:
Mitigation: Change TCU.ini setting to "ExternalViewerReqTimeoutMode=0" Vendor fix: Update to V1.15 SP5 or later version Updated software version can be obtained from Siemens customer support or a local partner. Vendor fix: Update to V1.25 SP1 or later version Updated software version can be obtained from Siemens customer support or a local partner. Vendor fix: Update to V4.95 SP5 or later version Updated software version can be obtained from Siemens customer support or a local partner. Vendor fix: Update to V5.25 SP1 or later version Updated software version can be obtained from Siemens customer support or a local partner. Vendor fix: Update to V6.15 SP5 or later version Updated software version can be obtained from Siemens customer support or a local partner. Vendor fix: Update to V6.25 SP1 or later version Updated software version can be obtained from Siemens customer support or a local partner. |
Scores and weakness types are as CISA or the republishing vendor stated them in this advisory; the linked CVE pages carry the independently enriched CVSS and SSVC assessments.
No coverage found in monitored research blogs or news feeds.
| CVE | CVSS | Affected |
|---|---|---|
| CVE-2025-40743 | 8.3 High | Siemens SINUMERIK 828D PPU.4 A vulnerability has been identified in SINUMERIK 828D PPU.4 (All versions < V4.95 SP5), SINUMERIK 828D PPU.5 (All versions < V5.25 SP1), SINUMERIK 84… |
Named by the advisory itself. Each CVE links to its tracked detail page.
Each vendor links to its Known Exploited Vulnerabilities catalog page. Only vendors that appear in the KEV catalog are listed, either because the publication cites one of their KEV entries or because it names them directly.