Security readout for executives and security teams
Plain-English summary
CVE-2019-10935 affects Siemens SIMATIC PCS 7 and WinCC DataMonitor. An authenticated attacker who can reach the DataMonitor web application could upload arbitrary ASPX code, potentially compromising confidentiality, integrity, and availability of the affected system.
Executive priority
Prioritize remediation for operational technology environments where DataMonitor is reachable by many users or remote access paths. The issue can affect system confidentiality, integrity, and availability, but sources do not show known active exploitation.
Technical view
The issue is CWE-434: unrestricted upload of dangerous file type in SIMATIC WinCC DataMonitor. A network-accessible, authenticated attacker can upload arbitrary ASPX code without user interaction across listed PCS 7, WinCC, WinCC Professional, and Runtime Professional versions.
Likely exposure
Exposure is most likely where affected Siemens PCS 7 or WinCC deployments use WinCC DataMonitor and allow network access to authenticated users. Internet exposure is not stated in the sources; validate internal, remote-access, and vendor-access paths.
Exploitation context
The Siemens advisory stated no public exploitation was known at publication. The CVE is not marked KEV in the provided bundle. Exploitation requires authentication and network access to the DataMonitor application, but no user interaction.
Researcher notes
Evidence is limited to the CVE record and Siemens advisory reference in the bundle. No CVSS vector is provided here. Avoid assuming exploit availability, internet-wide exposure, or complete fixes beyond Siemens-listed version thresholds.
Mitigation direction
- Update affected products to Siemens-listed fixed levels where available.
- For V13/all affected versions, check Siemens advisory guidance for supported migration paths.
- Restrict DataMonitor access to required trusted users and networks.
- Review DataMonitor accounts and remove unnecessary authenticated access.
- Monitor Siemens ProductCERT for superseding guidance.
Validation and detection
- Inventory PCS 7, WinCC, WinCC Professional, and Runtime Professional versions.
- Confirm whether WinCC DataMonitor is installed, enabled, and reachable.
- Compare installed versions against the affected version ranges in Siemens SSA-121293.
- Review authentication paths for users who can access DataMonitor.
- Check for unexpected ASPX uploads or web application changes.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-434: File access and web shell behavior lookup
File traversal and upload weaknesses can lead teams to review file, web shell, execution, and collection telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2019-10935 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://cert-portal.siemens.com/productcert/pdf/ssa-121293.pdfCVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Unrestricted Upload of File with Dangerous Type
Unrestricted Upload of File with Dangerous Type represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.