PT-2021-17044 · Synology · Synology Diskstation Manager

Claudio Bozzato · Published 2021-02-26 · Updated 2025-01-14 · CVE-2021-26566

Positive Technologies (AI Summary)

CVSS v3.1

9.0

Critical

Base vector

AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Synology DiskStation Manager (DSM) versions prior to 6.2.3-25426-3

Description The issue allows man-in-the-middle attackers to execute arbitrary commands via inbound QuickConnect traffic due to the insertion of sensitive information into sent data in the synorelayd component. This can be exploited by attackers to gain unauthorized access and control.

Recommendations For versions prior to 6.2.3-25426-3, update to version 6.2.3-25426-3 or later to resolve the issue. As a temporary workaround, consider restricting inbound QuickConnect traffic to minimize the risk of exploitation.

Exploit

Fix

Information Disclosure

Weakness Enumeration

CWE-200

CWE-201

Related Identifiers

CVE-2021-26566

Affected Products

Synology Diskstation Manager

References · 6

• 🔥 https://talosintelligence.com/vulnerability_reports/TALOS-2020-1160 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2021-26566 · Security Note
• https://osv.dev/vulnerability/CVE-2021-26566 · Vendor Advisory
• https://synology.com/security/advisory/Synology_SA_20_26 · Vendor Advisory
• https://t.me/cvenotify/13540 · Telegram Post
• https://t.me/cibsecurity/24269 · Telegram Post