CVE-2021-34809 | BDVDB-2026-155661 Detail

SynologyDownload Station

Description#

Improper neutralization of special elements used in a command ('Command Injection') vulnerability in task management component in Synology Download Station before 3.8.16-3566 allows remote authenticated users to execute arbitrary code via unspecified vectors.

Impact#

Per CVSS v3.1: confidentiality impact high, integrity impact high, availability impact high. Attack vector: network.

Weaknesses#

CWE-77 Improper Neutralization of Special Elements used in a Command ('Command Injection')

References#

https://www.synology.com/security/advisory/Synology_SA_21_11

Exploit#

No public exploit known

History#

Version 12021-06-18Record published in the CVE List.
Version 22024-09-16Most recent update recorded in the CVE List.

Published

Published: 2021-06-18
Last modified: 2024-09-16

Vendor information

Vendor: Synology
Product: Download Station

All Synology vulnerabilities

Score

9.9 Critical

EPSS

1.9%, Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 80.2.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Command Injection

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
< 3.8.16-3566
Fixed
3.8.16-3566

Scoring System

CVSS v4.0

Not available

CVSS v3.1

9.9 Critical

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Privileges Required	Low
User Interaction	None
Scope	Changed
Confidentiality	High
Integrity	High
Availability	High

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).