Is CVE-2021-21366 in the CISA KEV catalog?

No. CVE-2021-21366 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-21366?

CVE-2021-21366 has a CVSS v3 base score of 4.3 (MEDIUM).

What is the EPSS score for CVE-2021-21366?

CVE-2021-21366 has an EPSS score of 1.33% (67th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-21366?

Upgrade node-xmldom on debian 11 to 0.5.0-1 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2021-21366

MEDIUM

4.3

CVSS v3

NVD

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.

CWE-115 CWE-436

How to fix

Remediation Available

node-xmldomDebian

Fixed in:0.5.0-1CVE-2021-21366

node-xmldomUbuntu

Fixed in:0.1.27+ds-1+deb10u2build0.20.04.1USN-6102-1

Fixed in:0.7.5-1ubuntu0.22.04.1USN-6102-1

Fixed in:0.7.5-1ubuntu0.22.10.1USN-6102-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityLow

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Exploit Intelligence

1.33%probability of exploitation in 30 days

67thpercentile

Moderate risk: more likely to be exploited than 67% of all known CVEs.

References

Patch1

github.com

Vendor Advisory1

github.com

Third-Party Advisory1

lists.debian.org

Release Notes1

github.com

Product1

npmjs.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.