CVE-2017-15891

Name: CVE-2017-15891
Creator: NVD / NIST
Published: 2017-12-08T16:29:00.247+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 1.04%

Last modified Jun 17, 2026

CVE-2017-15891 is a vulnerability of currently unknown severity. Improper access control vulnerability in SYNO.Cal.EventBase in Synology Calendar before 2.0.1-0242 allows remote authenticated users to modify calendar event via unspecified vectors.. EPSS estimates a 1.04% chance of exploitation in the next 30 days.

Description

Improper access control vulnerability in SYNO.Cal.EventBase in Synology Calendar before 2.0.1-0242 allows remote authenticated users to modify calendar event via unspecified vectors.

Metrics

EPSS Probability

1.04%

59.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-284

Affected Software

Vendor	Product	Versions
Synology	Calendar	< 2.0.1-0242

References

https://www.synology.com/en-global/support/security/Synology_SA_17_68_CalendarVendor Advisory
https://www.synology.com/en-global/support/security/Synology_SA_17_68_CalendarVendor Advisory

Timeline

Published: Dec 8, 2017
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2017-15891?

Improper access control vulnerability in SYNO.Cal.EventBase in Synology Calendar before 2.0.1-0242 allows remote authenticated users to modify calendar event via unspecified vectors.

How severe is CVE-2017-15891?

Severity scoring for CVE-2017-15891 is pending analysis. The EPSS model estimates a 1.04% probability of exploitation in the next 30 days.

How do I fix CVE-2017-15891?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2017-15891?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST