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CVE-2021-28806— DOM-Based XSS Vulnerability in QTS and QuTS hero

Quick assessment

Affected
QNAP Systems Inc. QTS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Qnap Systems QNAP QTS是中国威联通（Qnap Systems）公司的一款类似SAN存储架构的数据存储设备。该设备支持分层存储、镜像保护等保障功能。 QNAP QTS 存在跨站脚本漏洞，该漏洞源于对用户提供的数据的无害化处理不足。以下产品及版本受到影响：QNAP QTS: before 4.5.3.1652 20210428 。

CVSS 5.7 · Medium EPSS 0.51% · P41

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter
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I. Basic Information for CVE-2021-28806

Vulnerability Information
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Vulnerability Title
DOM-Based XSS Vulnerability in QTS and QuTS hero
Source: CVE Program / CVE List V5
Vulnerability Description
A DOM-based XSS vulnerability has been reported to affect QNAP NAS running QTS and QuTS hero. If exploited, this vulnerability allows attackers to inject malicious code. This issue affects: QNAP Systems Inc. QTS versions prior to 4.5.3.1652 Build 20210428. QNAP Systems Inc. QuTS hero versions prior to h4.5.2.1638 Build 20210414. QNAP Systems Inc. QuTScloud versions prior to c4.5.5.1656 Build 20210503. This issue does not affect: QNAP Systems Inc. QTS 4.3.6; 4.3.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Qnap Systems QNAP QTS 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Qnap Systems QNAP QTS是中国威联通（Qnap Systems）公司的一款类似SAN存储架构的数据存储设备。该设备支持分层存储、镜像保护等保障功能。 QNAP QTS 存在跨站脚本漏洞，该漏洞源于对用户提供的数据的无害化处理不足。以下产品及版本受到影响：QNAP QTS: before 4.5.3.1652 20210428 。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
QNAP Systems Inc. QTS unspecified ~ 4.5.3.1652 Build 20210428 -
QNAP Systems Inc. QuTS hero unspecified ~ h4.5.2.1638 Build 20210414 -
QNAP Systems Inc. QuTScloud unspecified ~ c4.5.5.1656 Build 20210503 -

II. Public POCs for CVE-2021-28806

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III. Intelligence Information for CVE-2021-28806

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Same Patch Batch · QNAP Systems Inc. · 2021-06-03 · 3 CVEs total

CVE-2021-28812 8.8 HIGH Command Injection Vulnerability in Video Station
CVE-2021-28807 7.7 HIGH Post-Authentication Reflected XSS Vulnerability in Q'center

IV. Related Vulnerabilities

Same product: QTS
Same vendor: QNAP Systems Inc.
Same weakness: CWE-79

V. Comments for CVE-2021-28806

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