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CVE-2021-32821— Regular expression Denial of Service in MooTools

Quick assessment

Affected
mootools mootools-core
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.

mootools是一个用于 Web 开发的库，支持 OOP。 mootools 存在资源管理错误漏洞，该漏洞源于包含易受正则表达式拒绝服务 (ReDoS) 攻击的 CSS 选择器解析器，攻击者利用该漏洞可以在运行时将字符串注入 CSS 选择器。

CVSS 6.2 · Medium EPSS 0.64% · P49

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-32821

Vulnerability Information
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Vulnerability Title
Regular expression Denial of Service in MooTools
Source: CVE Program / CVE List V5
Vulnerability Description
MooTools is a collection of JavaScript utilities for JavaScript developers. All known versions include a CSS selector parser that is vulnerable to Regular Expression Denial of Service (ReDoS). An attack requires that an attacker can inject a string into a CSS selector at runtime, which is quite common with e.g. jQuery CSS selectors. No patches are available for this issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
mootools 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
mootools是一个用于 Web 开发的库，支持 OOP。 mootools 存在资源管理错误漏洞，该漏洞源于包含易受正则表达式拒绝服务 (ReDoS) 攻击的 CSS 选择器解析器，攻击者利用该漏洞可以在运行时将字符串注入 CSS 选择器。
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
mootools mootools-core 1.6.0 ~ 1.6.0 -

II. Public POCs for CVE-2021-32821

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III. Intelligence Information for CVE-2021-32821

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Other References for CVE-2021-32821 (1)

IV. Related Vulnerabilities

Same weakness: CWE-400

V. Comments for CVE-2021-32821

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