PT-2021-17042 · Synology · Synology Diskstation Manager

Claudio Bozzato · Published 2021-02-26 · Updated 2025-01-14 · CVE-2021-26564

Positive Technologies (AI Summary)

CVSS v3.1

8.7

High

Base vector

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

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

Description The issue concerns the cleartext transmission of sensitive information in the synorelayd component of Synology DiskStation Manager (DSM), allowing man-in-the-middle attackers to spoof servers via an HTTP session.

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 access to the synorelayd component to minimize the risk of exploitation.

Exploit

Fix

Cleartext Transmission of Sensitive Information

Weakness Enumeration

CWE-319

Related Identifiers

CVE-2021-26564

Affected Products

Synology Diskstation Manager

References · 5

• 🔥 https://talosintelligence.com/vulnerability_reports/TALOS-2020-1160 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2021-26564 · Security Note
• https://osv.dev/vulnerability/CVE-2021-26564 · Vendor Advisory
• https://synology.com/security/advisory/Synology_SA_20_26 · Vendor Advisory
• https://t.me/cibsecurity/24259 · Telegram Post