CVE-2021-21366

Misinterpretation of malicious XML input

Severity Score

4.3

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

xmldom es un módulo DOMParser y XMLSerializer basado en el estándar JavaScript W3C puro (XML DOM Level 2 Core). xmldom versiones 0.4.0 y anteriores, no preservan correctamente los identificadores del sistema, los FPI o los espacios de nombres cuando se analizan y serializan repetidamente documentos diseñados maliciosos. Esto puede conllevar a cambios sintácticos inesperados durante el procesamiento de XML en algunas aplicaciones posteriores. Esto es corregido en la versión 0.5.0. Como solución alternativa, las aplicaciones posteriores pueden comprobar la entrada y rechazar los documentos diseñados maliciosos

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

None

Integrity

Partial

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-12-22 CVE Reserved
2021-03-12 CVE Published
2024-03-29 EPSS Updated
2024-08-03 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-115: Misinterpretation of Input
CWE-436: Interpretation Conflict

CAPEC

References (5)

URL	Tag	Source
https://github.com/xmldom/xmldom/releases/tag/0.5.0	Release Notes
https://lists.debian.org/debian-lts-announce/2023/01/msg00000.html	Mailing List
https://www.npmjs.com/package/xmldom	Product

URL	Date	SRC

URL	Date	SRC
https://github.com/xmldom/xmldom/commit/d4201b9dfbf760049f457f9f08a3888d48835135	2023-02-28

URL	Date	SRC
https://github.com/xmldom/xmldom/security/advisories/GHSA-h6q6-9hqw-rwfv	2023-02-28

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Xmldom Project Search vendor "Xmldom Project"		Xmldom Search vendor "Xmldom Project" for product "Xmldom"				< 0.5.0 Search vendor "Xmldom Project" for product "Xmldom" and version " < 0.5.0"		node.js		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				10.0 Search vendor "Debian" for product "Debian Linux" and version "10.0"		-		Affected