Is CVE-2021-3918 in the CISA KEV catalog?

No. CVE-2021-3918 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-3918?

CVE-2021-3918 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2021-3918?

CVE-2021-3918 has an EPSS score of 3.56% (88th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-3918?

Upgrade node-json-schema on debian 11 to 0.3.0+~7.0.6-1+deb11u1 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2021-3918

CRITICALEPSS 88th pctl

9.8

CVSS v3

NVD

Description

json-schema is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

CWE-1321

How to fix

Remediation Available

node-json-schemaDebian

Fixed in:0.3.0+~7.0.6-1+deb11u1CVE-2021-3918

Fixed in:0.4.0+~7.0.9-1CVE-2021-3918

node-json-schemaUbuntu

Fixed in:0.2.3-1+deb10u1build0.18.04.1USN-6103-1

Fixed in:0.2.3-1+deb10u1build0.20.04.1USN-6103-1

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 InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

3.56%probability of exploitation in 30 days

88thpercentile

Elevated risk: more likely to be exploited than 88% of all known CVEs.

References

Patch2

Third-Party Advisory1

lists.debian.org

Other references1

security.netapp.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 2025-01-17.