Security readout for executives and security teams
Plain-English summary
This flaw could let an attacker trick a logged-in user into clicking hidden or misleading Synology SSO Server interface elements. The user must interact with attacker-controlled content, but the issue is network-reachable and needs no attacker login. Systems running SSO Server before 2.1.3-0129 are the stated concern.
Executive priority
Prioritize remediation for any exposed Synology SSO Server because this affects authentication-adjacent user interaction. Urgency is high for internet-facing deployments, but there is no provided evidence of active exploitation.
Technical view
CVE-2017-16775 is a CWE-1021 clickjacking issue in SSOOauth.cgi in Synology SSO Server before 2.1.3-0129. The CVSS 3.0 score is 7.1, with network attack vector, low complexity, no privileges required, required user interaction, changed scope, and low confidentiality, integrity, and availability impact.
Likely exposure
Exposure is most likely where Synology SSO Server is deployed and accessible to users through browsers, especially if reachable from untrusted networks. The source bundle does not specify affected subversions beyond versions before 2.1.3-0129.
Exploitation context
The provided sources describe remote clickjacking via unspecified vectors. They do not identify public exploit code, active exploitation, or CISA KEV listing. Treat exploitation as plausible social-engineering risk, not confirmed in-the-wild activity.
Researcher notes
The public description is brief and says vectors are unspecified. Avoid assuming specific UI flows or payloads. Validation should focus on version confirmation, exposure mapping, and whether rendered SSO pages can be framed before and after vendor remediation.
Mitigation direction
- Upgrade Synology SSO Server to version 2.1.3-0129 or later.
- Review Synology advisory Synology_SA_18_28 for official remediation details.
- Restrict SSO Server access to trusted networks if immediate upgrade is delayed.
- Prioritize user-facing SSO systems exposed to the internet.
Validation and detection
- Inventory Synology SSO Server installations and record installed package versions.
- Confirm no deployment is running a version before 2.1.3-0129.
- Check whether SSO Server endpoints are reachable from untrusted networks.
- Review browser-facing SSO pages for anti-framing protections after remediation.
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
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ATT&CK lookup starting points
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CWE-1021: Exact CWE lookup
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Open ATT&CK lookupCVE-2017-16775 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
- 7.1 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:L/PR:N/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:N/UI:R/S:C/C:L/I:L/A:L2.83.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
7.1HighVector: CVSS:3.0/AV:N/AC:L/PR:N/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_28CVE 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 Restriction of Rendered UI Layers or Frames
Improper Restriction of Rendered UI Layers or Frames represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.