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CVE-2021-38677— Reflected XSS Vulnerability in QcalAgent

Quick assessment

Affected
QNAP Systems Inc. QcalAgent
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 QcalAgent是中国威联通科技（Qnap）公司的一个时间管理中心。用于管理个人行程，与他人共用日历，分享彼此的排程。 QNAP QcalAgent 存在跨站脚本漏洞，该漏洞源于对用户提供的数据没有进行充分的清理。攻击者可利用该漏洞诱使受害者点击精心编制的链接，在用户浏览器中执行任意HTML和脚本代码。

CVSS 5.3 · Medium EPSS 0.70% · P50
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I. Basic Information for CVE-2021-38677

Vulnerability Information
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Vulnerability Title
Reflected XSS Vulnerability in QcalAgent
Source: CVE Program / CVE List V5
Vulnerability Description
A cross-site scripting (XSS) vulnerability has been reported to affect QNAP device running QcalAgent. If exploited, this vulnerability allows remote attackers to inject malicious code. We have already fixed this vulnerability in the following versions of QcalAgent: QcalAgent 1.1.7 and later
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/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 QcalAgent 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Qnap QcalAgent是中国威联通科技（Qnap）公司的一个时间管理中心。用于管理个人行程，与他人共用日历，分享彼此的排程。 QNAP QcalAgent 存在跨站脚本漏洞，该漏洞源于对用户提供的数据没有进行充分的清理。攻击者可利用该漏洞诱使受害者点击精心编制的链接，在用户浏览器中执行任意HTML和脚本代码。
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. QcalAgent unspecified ~ 1.1.7 -

II. Public POCs for CVE-2021-38677

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III. Intelligence Information for CVE-2021-38677

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Same Patch Batch · QNAP Systems Inc. · 2022-01-14 · 7 CVEs total

CVE-2021-38682 8.1 HIGH Stack Overflow Vulnerability in QVR Elite, QVR Pro and QVR Guard
CVE-2021-38689 8.1 HIGH Stack Overflow Vulnerability in QVR Elite, QVR Pro and QVR Guard
CVE-2021-38690 8.1 HIGH Stack Overflow Vulnerability in QVR Elite, QVR Pro and QVR Guard
CVE-2021-38691 8.1 HIGH Stack Overflow Vulnerability in QVR Elite, QVR Pro and QVR Guard
CVE-2021-38692 8.1 HIGH Stack Overflow Vulnerability in QVR Elite, QVR Pro and QVR Guard
CVE-2021-38678 6.1 MEDIUM Open Redirect Vulnerability in QcalAgent

IV. Related Vulnerabilities

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

V. Comments for CVE-2021-38677

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