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CVE-2021-21366— Misinterpretation of malicious XML input

Quick assessment

Affected
xmldom xmldom
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.

XMLDOM是jindw个人开发者的一个 W3C DOM for Node 的 JavaScript 实现。 XMLDOM 0.4.0及更早版本存在安全漏洞，该漏洞源于没有正确地保留系统标识符、fis或名称空间。

CVSS 4.3 · Medium EPSS 1.34% · P70

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-21366

Vulnerability Information
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Vulnerability Title
Misinterpretation of malicious XML input
Source: CVE Program / CVE List V5
Vulnerability Description
xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. xmldom versions 0.4.0 and older do not correctly preserve system identifiers, FPIs or namespaces when repeatedly parsing and serializing maliciously crafted documents. This may lead to unexpected syntactic changes during XML processing in some downstream applications. This is fixed in version 0.5.0. As a workaround downstream applications can validate the input and reject the maliciously crafted documents.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
解释冲突
Source: CVE Program / CVE List V5
Vulnerability Title
XMLDOM 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
XMLDOM是jindw个人开发者的一个 W3C DOM for Node 的 JavaScript 实现。 XMLDOM 0.4.0及更早版本存在安全漏洞，该漏洞源于没有正确地保留系统标识符、fis或名称空间。
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
xmldom xmldom < 0.5.0 -

II. Public POCs for CVE-2021-21366

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III. Intelligence Information for CVE-2021-21366

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Patches & Fixes for CVE-2021-21366 (1)

Vendor Advisories for CVE-2021-21366 (1)

Mailing List Discussions for CVE-2021-21366 (1)

Other References for CVE-2021-21366 (2)

IV. Related Vulnerabilities

Same product: xmldom
Same vendor: xmldom
Same weakness: CWE-436

V. Comments for CVE-2021-21366

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