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Video Station CVE-2021-33181

CRITICAL
Server-Side Request Forgery (SSRF) (CWE-918)
2021-06-01 security@synology.com
SSRF Synology Video Station
9.1
CVSS 3.1 · 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.

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Impact

CVSS score of 9.1 (CRITICAL). Attack characteristics: network attack vector, low complexity, high privileges required, no user interaction not required.
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.
Act Now Prioritize within 24-48h. Why: CRITICAL severity.
No patch listed yet 1.0% exploitation probability (EPSS)

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AnalysisAI

Server-Side Request Forgery (SSRF) vulnerability in webapi component in Synology Video Station before 2.4.10-1632 allows remote authenticated users to send arbitrary request to intranet resources via. Rated critical severity (CVSS 9.1), 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.

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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 webapi component in Synology Video Station before 2.4.10-1632 allows remote authenticated users to send arbitrary request to intranet resources via unspecified vectors. Affected products include: Synology Video Station. Version information: before 2.4.10.

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

NVD PRIMARY 9.1 CRITICAL
AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

DescriptionNVD

Server-Side Request Forgery (SSRF) vulnerability in webapi component in Synology Video Station before 2.4.10-1632 allows remote authenticated users to send arbitrary request to intranet resources via unspecified vectors.

Threat Intelligence Overview

EPSS Score
1.0%
Top 42% exploitable
Data Quality
2 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 CRITICAL
CISA KEV No
Public POC No
EPSS 1.0%
Patch available No
Active threat No
Deciding rule
CRITICAL severity
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

47
Low Medium High Critical
KEV: 0
EPSS: +1
CVSS: +46
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)NVD

cpe:2.3:a:synology:video_station:*:*:*:*:*:*:*:*

More in Video Station

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Synology Video Station before 1.5-0763 allows remote attackers to execute arbitrary shell commands via shell metacharact
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7.5 Sep 11

SQL injection vulnerability in Synology Video Station before 1.5-0763 allows remote attackers to execute arbitrary SQL c
CVE-2015-6910 HIGH POC
7.5 Sep 11

SQL injection vulnerability in Synology Video Station before 1.5-0757 allows remote attackers to execute arbitrary SQL c
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QNAP has already patched this vulnerability. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploita
CVE-2023-41288 HIGH
8.8 Jan 05

An OS command injection vulnerability has been reported to affect Video Station. Rated high severity (CVSS 8.8), this vu
CVE-2024-56804 HIGH
8.8 Oct 03

An SQL injection vulnerability has been reported to affect Video Station. If a remote attacker gains a user account, the
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CVE-2023-34975 HIGH
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An OS command injection vulnerability has been reported to affect several QNAP operating system versions. Rated high sev
CVE-2021-28812 HIGH
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A command injection vulnerability has been reported to affect certain versions of Video Station. Rated high severity (CV
CVE-2026-34015 HIGH
8.7 Oct 15

Authenticated path traversal in QNAP Video Station before 5.8.8 allows a remote attacker with a valid low-privileged use
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8.7 Oct 15

Unauthenticated remote attackers can read sensitive data from QNAP NAS devices running the optional Video Station (Video
CVE-2025-66275 HIGH
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Path traversal (CWE-22) in QNAP Video Station 5.8.x before 5.8.5 lets an authenticated remote user escape the applicatio

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

View all
CVE-2021-34473 CRITICAL POC
9.1
CVE-2021-26855 CRITICAL POC
9.1
CVE-2021-21985 CRITICAL POC
9.8
CVE-2022-41040 HIGH POC
8.8
CVE-2024-21893 HIGH POC
8.2
CVE-2021-40438 CRITICAL POC
9.0
CVE-2021-22054 HIGH POC
7.5
CVE-2021-21975 HIGH POC
7.5

Same technique SSRF

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CVE-2016-3718 MEDIUM POC
5.5

References

Advisories & patches
ADVISORY https://www.synology.com/security/advisory/Synology_SA_21_04

Search Externally

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