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Download Station CVE-2024-38640

HIGH
Cross-site Scripting (XSS) (CWE-79)
2024-09-06 security@qnapsecurity.com.tw
7.0
CVSS 4.0 · Vendor: qnapsecurity
View

Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V1 - Encoding and Sanitization Output encoding, context-aware escaping
MITRE ATT&CK

2 techniques across 2 tactics: Initial Access, Execution

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

Impact

CVSS score of 7.0 (HIGH). Attack characteristics: network attack vector, low complexity, low privileges required, user interaction required.

Exploit ScenarioDerived

A remote attacker could inject malicious scripts into web pages viewed by other users by sending crafted requests to the affected application.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
No patch listed yet 0.2% exploitation probability (EPSS)

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AnalysisAI

A cross-site scripting (XSS) vulnerability has been reported to affect Download Station. Rated high severity (CVSS 7.0), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Sanitize all user input, use Content-Security-Policy headers, encode output contextually (HTML, JS, URL). Use frameworks with built-in XSS protection.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified as Cross-Site Scripting (XSS) (CWE-79), which allows attackers to inject malicious scripts into web pages viewed by other users. A cross-site scripting (XSS) vulnerability has been reported to affect Download Station. If exploited, the vulnerability could allow authenticated users to inject malicious code via a network. We have already fixed the vulnerability in the following version: Download Station 5.8.6.283 ( 2024/06/21 ) and later Affected products include: Qnap Download Station.

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  • Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (qnapsecurity) PRIMARY 7.0 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (qnapsecurity) · only source for this CVE.

CVSS VectorVendor: qnapsecurity

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
Low
User Interaction
Passive
Vulnerable system: Confidentiality
High
Vulnerable system: Integrity
Low
Vulnerable system: Availability
None
Subsequent system: Confidentiality
None
Subsequent system: Integrity
None
Subsequent system: Availability
None

DescriptionCVE.org

A cross-site scripting (XSS) vulnerability has been reported to affect Download Station. If exploited, the vulnerability could allow authenticated users to inject malicious code via a network.

We have already fixed the vulnerability in the following version: Download Station 5.8.6.283 ( 2024/06/21 ) and later

Threat Intelligence Overview

EPSS Score
0.2%
Top 86% exploitable
Data Quality
2 sources
Confidence: Low

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity HIGH
CISA KEV No
Public POC No
EPSS 0.2%
Patch available No
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
No
Human Impact· derived
Medium

Priority Score

35
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +35
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Cross-Site Scripting occurs when an application accepts untrusted data and sends it to a web browser without proper validation or encoding.

Affected Products (CPE)CVE.org

cpe:2.3:a:qnap:download_station:*:*:*:*:*:*:*:*
CVE-2021-34810 HIGH
8.8 Jun 18

Improper privilege management vulnerability in cgi component in Synology Download Station before 3.8.16-3566 allows remo

CVE-2021-34809 HIGH
8.8 Jun 18

Improper neutralization of special elements used in a command ('Command Injection') vulnerability in task management com

CVE-2026-34014 HIGH
8.4 Oct 15

Incorrect permission assignment in QNAP Download Station (all builds prior to 5.10.1.312 or 5.11.2.321) lets a local att

CVE-2015-6909 MEDIUM POC
4.3 Sep 11

Cross-site scripting (XSS) vulnerability in the "Create download task via file upload" feature in Synology Download Stat

CVE-2015-6913 MEDIUM POC
4.3 Sep 11

Cross-site scripting (XSS) vulnerability in the "Create download task via URL" feature in Synology Download Station befo

CVE-2017-11156 HIGH
7.8 Aug 14

Synology Download Station 3.8.x before 3.8.5-3475 and 3.x before 3.5-2984 uses weak permissions (0777) for ui/dlm/btsear

CVE-2021-33184 HIGH
7.7 Jun 01

Server-Side request forgery (SSRF) vulnerability in task management component in Synology Download Station before 3.8.15

CVE-2017-11149 MEDIUM
6.5 Aug 14

Server-side request forgery (SSRF) vulnerability in Downloader in Synology Download Station 3.8.x before 3.8.5-3475 and

CVE-2026-39989 MEDIUM
5.3 Oct 15

Server-side request forgery in QNAP Download Station allows a low-privileged authenticated user to make the NAS applicat

CVE-2021-34811 MEDIUM
4.3 Jun 18

Server-Side Request Forgery (SSRF) vulnerability in task management component in Synology Download Station before 3.8.16

CVE-2025-58463 LOW
2.3 Nov 07

A relative path traversal vulnerability has been reported to affect Download Station. Rated low severity (CVSS 2.3), thi

CVE-2025-58465 LOW
2.2 Nov 07

A cross-site scripting (XSS) vulnerability has been reported to affect Download Station. Rated low severity (CVSS 2.2),

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