Security readout for executives and security teams
Plain-English summary
Older Synology DSM releases allowed a local user to inject web script or HTML through synodsmnotify. This is not described as a remote takeover issue in the sources, but it can undermine trust in DSM content and should be removed from managed NAS environments.
Executive priority
Treat this as a targeted hygiene item for legacy Synology NAS systems, not an emergency based on the supplied evidence. Patch or retire affected DSM versions during the next security maintenance window.
Technical view
CVE-2017-16766 is an improper access control issue in synodsmnotify affecting Synology DSM before 6.1.4-15217 and before 6.0.3-8754-6. A local user can inject arbitrary web script or HTML via the -fn option. No CVSS score is provided in the bundle.
Likely exposure
Exposure is limited to Synology DiskStation Manager systems running the listed pre-fix versions, especially where local user access exists or is shared among multiple administrators, operators, or applications.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. Evidence supports local-user script or HTML injection only; remote exploitability and weaponized use are not established in the bundle.
Researcher notes
The record lacks CVSS data and detailed exploitation conditions beyond local access and the -fn option. Avoid assuming remote reachability, privilege escalation, or browser impact unless Synology advisory details or internal testing confirms it.
Mitigation direction
- Upgrade DSM to a fixed vendor-supported release.
- Prioritize DSM 6.1.4-15217, 6.0.3-8754-6, or later where applicable.
- Review Synology advisory SA-17-74 for model-specific guidance.
- Restrict local DSM and shell access to trusted users only.
- Retire unsupported DSM versions from production networks.
Validation and detection
- Inventory Synology DSM versions across managed NAS devices.
- Confirm no systems run DSM before 6.1.4-15217 or 6.0.3-8754-6.
- Check whether local user accounts are still required.
- Review administrative logs for unusual local account activity.
- Document remediation status for affected appliances.
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-284: Authorization and privilege behavior lookup
Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. 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-2017-16766 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://www.synology.com/en-global/support/security/Synology_SA_17_74CVE 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.
Improper Access Control
Improper Access Control represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.