PT-2021-17039 · Synology · Synology Diskstation Manager

Claudio Bozzato + 1 · Published 2021-02-26 · Updated 2025-01-14 · CVE-2021-26561

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 A stack-based buffer overflow issue allows man-in-the-middle attackers to execute arbitrary code via the syno finder site HTTP header. This enables attackers to potentially compromise the system.

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 synoagentregisterd service to minimize the risk of exploitation. Avoid using the syno finder site HTTP header in sensitive operations until the issue is resolved.

Exploit

Fix

Buffer Overflow

Stack Overflow

Weakness Enumeration

CWE-119

CWE-121

Related Identifiers

CVE-2021-26561

Affected Products

Synology Diskstation Manager

References · 6

• 🔥 https://talosintelligence.com/vulnerability_reports/TALOS-2020-1159 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2021-26561 · Security Note
• https://osv.dev/vulnerability/CVE-2021-26561 · Vendor Advisory
• https://synology.com/security/advisory/Synology_SA_20_26 · Vendor Advisory
• https://t.me/cvenotify/29303 · Telegram Post
• https://t.me/cibsecurity/24252 · Telegram Post