CVE-2020-27650

Severity: low (CVSS 3.7 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-10-29 · updated 2026-06-17
Weakness: CWE-614

Description

Synology DiskStation Manager (DSM) before 6.2.3-25426-2 does not set the Secure flag for the session cookie in an HTTPS session, which makes it easier for remote attackers to capture this cookie by intercepting its transmission within an HTTP session.

Affected products

Synology DiskStation Manager: from 6.2 before 6.2.3-25426-2 — fixed in 6.2.3-25426-2
Synology Skynas Firmware: before 6.2.3-25426 — fixed in 6.2.3-25426

How to fix

Upgrade to a fixed version: Synology DiskStation Manager 6.2.3-25426-2; Synology Skynas Firmware 6.2.3-25426. Check the vendor advisory for mitigations.

References

https://www.synology.com/security/advisory/Synology_SA_20_18
https://www.synology.com/security/advisory/Synology_SA_20_18

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