What’s Vulnerable › Vulnerabilities

CVE-2021-29086

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-06-23 · updated 2026-06-17
• Weakness: CWE-200

Description

Exposure of sensitive information to an unauthorized actor vulnerability in webapi component in Synology DiskStation Manager (DSM) before 6.2.3-25426-3 allows remote attackers to obtain sensitive information via unspecified vectors.

Affected products

• Synology DiskStation Manager: from 6.2 before 6.2.3-25426-3 — fixed in 6.2.3-25426-3
• Synology Diskstation Manager Unified Controller: before 3.1-23033 — fixed in 3.1-23033

How to fix

Upgrade to a fixed version: Synology DiskStation Manager 6.2.3-25426-3; Synology Diskstation Manager Unified Controller 3.1-23033. Check the vendor advisory for mitigations.

References

• https://www.synology.com/security/advisory/Synology_SA_20_26
• https://www.synology.com/security/advisory/Synology_SA_20_26

Get alerted when CVE-2021-29086 or the next vulnerability affects your stack