Security readout for executives and security teams
Plain-English summary
Siemens syngo fastView can mishandle specially crafted BMP image files. If a user opens a malicious BMP, the application could write outside expected memory and allow code execution with that user’s privileges.
Executive priority
Treat this as a high-priority workstation and clinical viewer risk, especially where staff handle external files. It is not confirmed as actively exploited in the provided sources.
Technical view
The issue is CWE-787 out-of-bounds write during BMP parsing in syngo fastView. The CVSS 3.1 score is 7.8 high, with local attack vector, low complexity, no privileges required, and required user interaction.
Likely exposure
Exposure is limited to environments running Siemens syngo fastView, listed as all versions, where users may open BMP files from untrusted email, web, removable media, or shared folders.
Exploitation context
The source bundle does not show CISA KEV listing or active exploitation. The CVSS vector lists proof-of-concept exploit maturity, but user interaction is required.
Researcher notes
Validation should focus on product presence, file-ingest pathways, user interaction requirements, and vendor advisory status. Do not assume a patch exists from the supplied data; remediation specifics must come from Siemens guidance.
Mitigation direction
- Consult Siemens Healthineers advisory SHSA-688797 for current remediation or workaround guidance.
- Restrict users from opening BMP files from untrusted sources in syngo fastView.
- Use least-privilege accounts on workstations running syngo fastView.
- Apply endpoint controls that quarantine suspicious image attachments and downloads.
- Prioritize remediation where syngo fastView handles external clinical or partner-provided files.
Validation and detection
- Inventory workstations and clinical systems for syngo fastView installations.
- Confirm whether installed deployments match Siemens’ affected product statement: all versions.
- Review email, browser, and file-share paths that could deliver BMP files to users.
- Check EDR or application logs for syngo fastView crashes after BMP handling.
- Track Siemens Healthineers advisory SHSA-688797 for fix availability or vendor-specific instructions.
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-2021-42028 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
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 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.