What’s Vulnerable › Vulnerabilities

CVE-2017-15887

• Severity: critical (CVSS 9.8 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2017-11-07 · updated 2026-06-17
• Weakness: CWE-307

Description

An improper restriction of excessive authentication attempts vulnerability in /principals in Synology CardDAV Server before 6.0.7-0085 allows remote attackers to obtain user credentials via a brute-force attack.

Affected products

• Synology CardDAV Server: before 6.0.7-0085 — fixed in 6.0.7-0085

How to fix

Upgrade to a fixed version: Synology CardDAV Server 6.0.7-0085. Check the vendor advisory for mitigations.

References

• https://www.synology.com/en-global/support/security/Synology_SA_17_64_CardDAV_Server
• https://www.synology.com/en-global/support/security/Synology_SA_17_64_CardDAV_Server

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