How severe is CVE-2017-16775?

CVE-2017-16775 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2017-16775 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-16775?

CVE-2017-16775 affects Synology Sso Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2017-16775?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2017-16775 published?

CVE-2017-16775 was published on 2019-04-01 and last updated on 2026-06-17.

CVE-2017-16775

CVE-2017-16775 is a high-severity vulnerability in Synology Sso Server with a CVSS 3.x base score of 7.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-20.

Key facts

Severity: High (CVSS 3.x base score 7.1)
CVSS v2: 5.8
EPSS exploit prediction: 1% (61st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Synology Sso Server
Published: 2019-04-01
Last modified: 2026-06-17

Description

Improper restriction of rendered UI layers or frames vulnerability in SSOOauth.cgi in Synology SSO Server before 2.1.3-0129 allows remote attackers to conduct clickjacking attacks via unspecified vectors.

Frequently asked questions

What is CVE-2017-16775?: Improper restriction of rendered UI layers or frames vulnerability in SSOOauth.cgi in Synology SSO Server before 2.1.3-0129 allows remote attackers to conduct clickjacking attacks via unspecified vectors.
How severe is CVE-2017-16775?: CVE-2017-16775 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2017-16775 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-16775?: CVE-2017-16775 affects Synology Sso Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2017-16775?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2017-16775 published?: CVE-2017-16775 was published on 2019-04-01 and last updated on 2026-06-17.

References

https://www.synology.com/security/advisory/Synology_SA_18_28

Affected products (1)

cpe:2.3:a:synology:sso_server:*:*:*:*:*:*:*:*

More vulnerabilities in Synology Sso Server

CVE-2022-27620 — Medium (CVSS 6.8): Improper limitation of a pathname to a restricted directory ('Path Traversal') vulnerability in webapi component in…

All CVEs affecting Synology Sso Server →

Other CWE-20 (Improper Input Validation) vulnerabilities

CVE-2026-48316 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Input Validation vulnerability that could…
CVE-2026-48281 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Input Validation vulnerability that could…
CVE-2026-48277 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Input Validation vulnerability that could…
CVE-2026-48055 — Critical (CVSS 10.0): Streambert is a cross-platform Electron Desktop App to stream and download any video media. In versions 2.4.0 and…
CVE-2026-34910 — Critical (CVSS 10.0): A malicious actor with access to the network could exploit an Improper Input Validation vulnerability found in UniFi OS…
CVE-2026-33587 — Critical (CVSS 10.0): Lack of user input sanitisation in Open Notebook v1.8.3 allows the application user to execute Python code (and…

Browse all CWE-20 (Improper Input Validation) vulnerabilities →