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CVE-2021-33604— Reflected cross-site scripting in development mode handler in Vaadin 14, 15-19

Quick assessment

Affected
Vaadin Vaadin
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.

Vaadin flow是一个应用软件。Vaadin平台的Java框架，用于构建外观美观，性能良好并让您和您的用户感到满意的现代网站。 vaadin:flow-server存在安全漏洞，该漏洞源于开发模式处理程序中的 URL 编码错误。该漏洞允许本地攻击者通过在浏览器中打开精心制作的 URL 来执行任意 JavaScript 代码。

CVSS 2.5 · Low EPSS 0.29% · P19

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter
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I. Basic Information for CVE-2021-33604

Vulnerability Information
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Vulnerability Title
Reflected cross-site scripting in development mode handler in Vaadin 14, 15-19
Source: CVE Program / CVE List V5
Vulnerability Description
URL encoding error in development mode handler in com.vaadin:flow-server versions 2.0.0 through 2.6.1 (Vaadin 14.0.0 through 14.6.1), 3.0.0 through 6.0.9 (Vaadin 15.0.0 through 19.0.8) allows local user to execute arbitrary JavaScript code by opening crafted URL in browser.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
编码错误
Source: CVE Program / CVE List V5
Vulnerability Title
vaadin:flow-server 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Vaadin flow是一个应用软件。Vaadin平台的Java框架，用于构建外观美观，性能良好并让您和您的用户感到满意的现代网站。 vaadin:flow-server存在安全漏洞，该漏洞源于开发模式处理程序中的 URL 编码错误。该漏洞允许本地攻击者通过在浏览器中打开精心制作的 URL 来执行任意 JavaScript 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
Vaadin Vaadin 14.0.0 ~ unspecified -
Vaadin flow-server 2.0.0 ~ unspecified -

II. Public POCs for CVE-2021-33604

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III. Intelligence Information for CVE-2021-33604

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Patches & Fixes for CVE-2021-33604 (1)

Other References for CVE-2021-33604 (1)

IV. Related Vulnerabilities

Same product: Vaadin
Same vendor: Vaadin
Same weakness: CWE-172

V. Comments for CVE-2021-33604

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