What is the CVSS score of CVE-2017-11149?

CVE-2017-11149 has a CVSS 3.0 base score of 6.5 (Medium). CVSS vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N. EPSS exploitation probability: 0.2%.

Download Station CVE-2017-11149

MEDIUM

Server-Side Request Forgery (SSRF) (CWE-918)

2017-08-14 security@synology.com

SSRF Synology Download Station

6.5

CVSS 3.0 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-918 OWASP Top 10:2025 A01:2025 - Broken Access Control ASVS 5.0 V4 - API and Web Service URL allowlisting, SSRF prevention MITRE ATT&CK 2 techniques across 2 tactics: Initial Access, Credential Access The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	CVSS score of 6.5 (MEDIUM). Attack characteristics: network attack vector, low complexity, low privileges required, no user interaction not required. EPSS exploitation probability: 0.18%.
Exploit ScenarioDerived	A remote attacker could make the server perform requests to unintended internal or external resources by sending crafted requests to the affected application.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).

No patch listed yet 0.2% exploitation probability (EPSS)

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AnalysisAI

Server-side request forgery (SSRF) vulnerability in Downloader in Synology Download Station 3.8.x before 3.8.5-3475 and 3.x before 3.5-2984 allows remote authenticated users to download arbitrary. Rated medium severity (CVSS 6.5), 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. Validate and allowlist destination URLs, block requests to internal networks, use network segmentation.

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 Server-Side Request Forgery (SSRF) (CWE-918), which allows attackers to make the server perform requests to unintended internal or external resources. Server-side request forgery (SSRF) vulnerability in Downloader in Synology Download Station 3.8.x before 3.8.5-3475 and 3.x before 3.5-2984 allows remote authenticated users to download arbitrary local files via crafted URI. Affected products include: Synology Download Station. Version information: before 3.8.5.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 6.5 MEDIUM

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

DescriptionCVE.org

Threat Intelligence Overview

EPSS Score

0.2%

Top 61% exploitable

Data Quality

3 sources

Confidence: Low

NVD

CVE.org

EPSS

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 MEDIUM

CISA KEV No

Public POC No

EPSS 0.2%

Patch available No

Active threat No

Deciding rule

MEDIUM severity (CVSS 4.0-6.9)

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

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +32

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Server-Side Request Forgery HIGH

Server-Side Request Forgery exploits applications that fetch remote resources based on user-supplied URLs.

Affected Products (CPE)CVE.org

cpe:2.3:a:synology:download_station:3.2-2295:*:*:*:*:*:*:*

cpe:2.3:a:synology:download_station:3.3-2382:*:*:*:*:*:*:*

cpe:2.3:a:synology:download_station:3.3-2383:*:*:*:*:*:*:*

cpe:2.3:a:synology:download_station:3.3-2386:*:*:*:*:*:*:*

cpe:2.3:a:synology:download_station:3.4-2477:*:*:*:*:*:*:*

cpe:2.3:a:synology:download_station:3.4-2478:*:*:*:*:*:*:*

cpe:2.3:a:synology:download_station:3.4-2480:*:*:*:*:*:*:*

cpe:2.3:a:synology:download_station:3.4-2485:*:*:*:*:*:*:*

cpe:2.3:a:synology:download_station:3.4-2486:*:*:*:*:*:*:*

cpe:2.3:a:synology:download_station:3.4-2489:*:*:*:*:*:*:*

cpe:2.3:a:synology:download_station:3.4-2490:*:*:*:*:*:*:*

cpe:2.3:a:synology:download_station:3.4-2514:*:*:*:*:*:*:*

cpe:2.3:a:synology:download_station:3.4-2555:*:*:*:*:*:*:*

cpe:2.3:a:synology:download_station:3.4-2557:*:*:*:*:*:*:*

cpe:2.3:a:synology:download_station:3.4-2558:*:*:*:*:*:*:*

cpe:2.3:a:synology:download_station:3.5-2638:*:*:*:*:*:*:*

cpe:2.3:a:synology:download_station:3.5-2705:*:*:*:*:*:*:*

cpe:2.3:a:synology:download_station:3.5-2706:*:*:*:*:*:*:*

cpe:2.3:a:synology:download_station:3.5-2955:*:*:*:*:*:*:*

cpe:2.3:a:synology:download_station:3.5-2956:*:*:*:*:*:*:*

+ 13 more

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Same weakness CWE-918 – Server-Side Request Forgery (SSRF)

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CVE-2021-34473 CRITICAL POC

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CVE-2021-26855 CRITICAL POC

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CVE-2021-21985 CRITICAL POC

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CVE-2022-41040 HIGH POC

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CVE-2024-21893 HIGH POC

8.2

CVE-2021-40438 CRITICAL POC

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CVE-2021-22054 HIGH POC

7.5

CVE-2021-21975 HIGH POC

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Same technique SSRF

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CVE-2016-3718 MEDIUM POC

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References

Advisories & patches

ADVISORY https://www.synology.com/en-global/support/security/Synology_SA_17_28_Download_Station

Search Externally

GitHub PoC

Exploit-DB PacketStorm Snyk Rapid7 Nuclei Templates Trickest PoC

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