Security readout for executives and security teams
Plain-English summary
A logged-in attacker could inject script or HTML into Synology DSM’s personal notification event handling. The issue needs user interaction and valid authentication, so it is not a simple unauthenticated takeover, but it can still expose sensitive browser sessions or alter what administrators see.
Executive priority
Treat as a moderate-priority remediation item. It is less urgent than unauthenticated remote code execution, but DSM often protects storage and administrative data, so exposed or shared systems should be patched promptly.
Technical view
CVE-2017-16774 is a CWE-79 cross-site scripting flaw in SYNO.Core.PersonalNotification.Event in Synology DSM before 6.1.4-15217-3. The package parameter can carry attacker-controlled web script or HTML. CVSS 3.0 is 6.5 with network attack vector, low privileges required, and user interaction required.
Likely exposure
Exposure is likely limited to Synology DSM deployments older than 6.1.4-15217-3 where authenticated users can reach the DSM web interface. Risk increases if DSM is internet-accessible or shared with many lower-privileged users.
Exploitation context
The source bundle does not show CISA KEV listing or public evidence of active exploitation. The CVSS vector indicates exploitation requires authentication and user interaction, with low confidentiality, integrity, and availability impact.
Researcher notes
The available evidence identifies the vulnerable component and parameter but does not provide detailed exploit mechanics in the bundle. Keep analysis scoped to authenticated XSS in DSM before 6.1.4-15217-3 and avoid assuming broader Synology product impact.
Mitigation direction
- Upgrade Synology DSM to 6.1.4-15217-3 or later.
- Review Synology advisory SA-18-26 for vendor-specific remediation guidance.
- Restrict DSM web interface access to trusted networks and users.
- Reduce unnecessary DSM accounts and privileges.
- Monitor for suspicious DSM UI or notification behavior.
Validation and detection
- Inventory Synology DSM versions across managed assets.
- Flag any DSM instance earlier than 6.1.4-15217-3.
- Confirm whether DSM web access is internet-facing or broadly reachable.
- Verify the Synology advisory applies to the deployed DSM branch.
- Check whether vulnerable systems have been upgraded or isolated.
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-79: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. 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-2017-16774 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
- Medium
- CVSS
- 6.5 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L
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:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L2.33.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
6.5MediumVector: CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L
Source materials
- CVE List V5 sourceCVE List V5
- https://www.synology.com/security/advisory/Synology_SA_18_26CVE 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 Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.