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CVE-2021-21252— Regular expression denial of service in jquery-validation

Quick assessment

Affected
jquery-validation jquery-validation
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.

jQuery是美国John Resig个人开发者的一套开源、跨浏览器的JavaScript库。该库简化了HTML与JavaScript之间的操作，并具有模块化、插件扩展等特点。 jQuery 1.19.3版本之前存在资源管理错误漏洞，该漏洞源于jquery验证包含一个或多个正则表达式，这些正则表达式容易受到ReDoS(正则表达式拒绝服务)的攻击。

CVSS 5.3 · Medium EPSS 3.44% · P88

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2021-21252

Vulnerability Information
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Vulnerability Title
Regular expression denial of service in jquery-validation
Source: CVE Program / CVE List V5
Vulnerability Description
The jQuery Validation Plugin provides drop-in validation for your existing forms. It is published as an npm package "jquery-validation". jquery-validation before version 1.19.3 contains one or more regular expressions that are vulnerable to ReDoS (Regular Expression Denial of Service). This is fixed in 1.19.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
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
jQuery 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
jQuery是美国John Resig个人开发者的一套开源、跨浏览器的JavaScript库。该库简化了HTML与JavaScript之间的操作，并具有模块化、插件扩展等特点。 jQuery 1.19.3版本之前存在资源管理错误漏洞，该漏洞源于jquery验证包含一个或多个正则表达式，这些正则表达式容易受到ReDoS(正则表达式拒绝服务)的攻击。
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
jquery-validation jquery-validation < 1.19.3 -

II. Public POCs for CVE-2021-21252

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III. Intelligence Information for CVE-2021-21252

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Patches & Fixes for CVE-2021-21252 (2)

Vendor Advisories for CVE-2021-21252 (2)

Mailing List Discussions for CVE-2021-21252 (1)

Other References for CVE-2021-21252 (1)

IV. Related Vulnerabilities

Same product: jquery-validation
Same vendor: jquery-validation
Same weakness: CWE-400

V. Comments for CVE-2021-21252

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