How severe is CVE-2017-16766?

CVE-2017-16766 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2017-16766 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-16766?

CVE-2017-16766 primarily affects Synology Diskstation Manager. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2017-16766?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2017-16766 published?

CVE-2017-16766 was published on 2017-12-22 and last updated on 2026-06-17.

CVE-2017-16766

CVE-2017-16766 is a medium-severity vulnerability in Synology Diskstation Manager with a CVSS 3.x base score of 6.5. 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-74.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 6.4
EPSS exploit prediction: 1% (53rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-74
Affected product: Synology Diskstation Manager
Published: 2017-12-22
Last modified: 2026-06-17

Description

An improper access control vulnerability in synodsmnotify in Synology DiskStation Manager (DSM) before 6.1.4-15217 and before 6.0.3-8754-6 allows local users to inject arbitrary web script or HTML via the -fn option.

Frequently asked questions

What is CVE-2017-16766?: An improper access control vulnerability in synodsmnotify in Synology DiskStation Manager (DSM) before 6.1.4-15217 and before 6.0.3-8754-6 allows local users to inject arbitrary web script or HTML via the -fn option.
How severe is CVE-2017-16766?: CVE-2017-16766 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2017-16766 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-16766?: CVE-2017-16766 primarily affects Synology Diskstation Manager. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2017-16766?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2017-16766 published?: CVE-2017-16766 was published on 2017-12-22 and last updated on 2026-06-17.

References

https://www.synology.com/en-global/support/security/Synology_SA_17_74

Affected products (2)

cpe:2.3:a:synology:diskstation_manager:*:*:*:*:*:*:*:*
cpe:2.3:o:synology:diskstation_manager:*:*:*:*:*:*:*:*

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Threat intelligence

Threat-intel indicators referencing this CVE:

220.77.214.59 (ipv4-addr)