How severe is CVE-2017-15886?

CVE-2017-15886 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2017-15886 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-15886?

CVE-2017-15886 affects Synology Chat. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2017-15886?

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

When was CVE-2017-15886 published?

CVE-2017-15886 was published on 2017-12-28 and last updated on 2026-06-17.

CVE-2017-15886

CVE-2017-15886 is a medium-severity vulnerability in Synology Chat 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-918.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 4.0
EPSS exploit prediction: 2% (73rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-918
Affected product: Synology Chat
Published: 2017-12-28
Last modified: 2026-06-17

Description

Server-side request forgery (SSRF) vulnerability in Link Preview in Synology Chat before 2.0.0-1124 allows remote authenticated users to download arbitrary local files via a crafted URI.

Frequently asked questions

What is CVE-2017-15886?: Server-side request forgery (SSRF) vulnerability in Link Preview in Synology Chat before 2.0.0-1124 allows remote authenticated users to download arbitrary local files via a crafted URI.
How severe is CVE-2017-15886?: CVE-2017-15886 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2017-15886 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-15886?: CVE-2017-15886 affects Synology Chat. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2017-15886?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2017-15886 published?: CVE-2017-15886 was published on 2017-12-28 and last updated on 2026-06-17.

References

https://www.synology.com/en-global/support/security/Synology_SA_17_78

Affected products (1)

cpe:2.3:a:synology:chat:*:*:*:*:*:*:*:*

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