CVE-2020-36194Network attack vector

Browser code injection via Media Viewer

Published Jul 1, 2021 · Updated Sep 17, 2024

Cross-site scripting in Media Viewer in QNAP QTS before 4.5.2.1566 and QuTS hero before h4.5.2.1638 allows remote attackers to inject code. QNAP identifies Media Viewer as the affected component, but public vendor and CNA records do not disclose which input is mishandled or how it reaches an HTML response. Successful exploitation runs attacker-supplied code in a victim's browser context, but reaching the flaw requires the victim to interact with attacker-controlled content.

CVSS severity6.1
Medium
EPSS probability0.58%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Media Viewer in QNAP QTS before 4.5.2.1566 and QuTS hero before h4.5.2.1638 allows remote attackers to inject code. QNAP identifies Media Viewer as the affected component, but public vendor and CNA records do not disclose which input is mishandled or how it reaches an HTML response. Successful exploitation runs attacker-supplied code in a victim's browser context, but reaching the flaw requires the victim to interact with attacker-controlled content.

The record

CVE
CVE-2020-36194
Published
Jul 1, 2021
Updated
Sep 17, 2024
Vendor
Linn Products Limited
Product
QuTS hero
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 1, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <h4.5.2.1638 build 20210414

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Linn Products Limited · QuTS heroversion=unspecified <h4.5.2.1638 build 20210414
Linn Products Limited · QTSversion=unspecified <4.5.2.1566 Build 20210202

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
6.1QNAP Systems, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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