Security readout for executives and security teams
Plain-English summary
CVE-2021-40367 affects Siemens Healthineers syngo fastView. A specially crafted DICOM file could trigger memory corruption when opened, potentially letting code run as the user running the application. This is high impact because DICOM files may move between clinical systems, partners, and workstations.
Executive priority
Treat this as a high-priority workstation risk for environments using syngo fastView. The business urgency is highest where DICOM files arrive from outside trusted clinical systems, because successful exploitation could compromise the user session on affected machines.
Technical view
The issue is a CWE-787 out-of-bounds write caused by insufficient validation of user-supplied data during DICOM parsing. CVSS 3.1 is 7.8: local attack vector, low complexity, no privileges required, user interaction required, and high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is most likely on endpoints or clinical workstations where syngo fastView is installed and used to open DICOM files, especially files received from external sources or removable media. The source states all versions are affected, but does not provide deployment prevalence.
Exploitation context
The source bundle does not show known active exploitation and the CVE is not listed as KEV. Exploitation requires a user or workflow to open a malicious DICOM file locally. Public evidence cited here supports potential code execution, not confirmed real-world attacks.
Researcher notes
Evidence is sufficient for vulnerability class, affected product, impact, and CVSS characteristics. Remediation details are incomplete in the provided bundle, so do not assume a specific fixed version. Validate directly against Siemens Healthineers advisory SHSA-688797.
Mitigation direction
- Review Siemens Healthineers advisory SHSA-688797 for current remediation or compensating controls.
- Avoid opening DICOM files from untrusted sources until vendor guidance is applied.
- Prioritize vendor-recommended updates or replacement guidance for deployed syngo fastView installations.
- Run syngo fastView with least-privilege user accounts where operationally feasible.
- Apply endpoint controls to scan and restrict externally supplied DICOM files.
Validation and detection
- Inventory systems for Siemens syngo fastView installations and record versions.
- Identify workflows where users open DICOM files from external parties or removable media.
- Confirm whether Siemens advisory SHSA-688797 lists an applicable update or workaround.
- Review endpoint telemetry for syngo fastView crashes after opening DICOM files.
- Verify controls prevent untrusted DICOM files from reaching viewer workstations.
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-787: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. 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-2021-40367 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
- High
- CVSS
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:U/RC:C
CNA and ADP enrichment extracted from CVE v5
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CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:U/RC:C1.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:U/RC:C
Source materials
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.
Out-of-bounds Write
Out-of-bounds Write represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.