Is CVE-2021-28918 in the CISA KEV catalog?

No. CVE-2021-28918 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-28918?

CVE-2021-28918 has a CVSS v3 base score of 9.1 (CRITICAL).

What is the EPSS score for CVE-2021-28918?

CVE-2021-28918 has an EPSS score of 16.66% (97th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-28918?

Upgrade netmask to 2.0.1 or later.

CVE & CISA-KEV Catalog

CVE-2021-28918

CRITICALEPSS 97th pctl

9.1

CVSS v3

NVD

Description

Improper input validation of octal strings in netmask npm package v1.0.6 and below allows unauthenticated remote attackers to perform indeterminate SSRF, RFI, and LFI attacks on many of the dependent packages. A remote unauthenticated attacker can bypass packages relying on netmask to filter IPs and reach critical VPN or LAN hosts.

CWE-704

How to fix

Remediation Available

netmasknpm

Fixed in:2.0.1GHSA-pch5-whg9-qr2r

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

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

AvailabilityNone

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

Exploit Intelligence

16.66%probability of exploitation in 30 days

97thpercentile

Very high risk: more likely to be exploited than 97% of all known CVEs.

References

Exploit2

Third-Party Advisory5

Related Vulnerabilities

Other CWE-704 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-41646	Critical	9.8	43%	-	Fix
CVE-2017-5115	High	8.8	26%	-	Fix
CVE-2018-12453	High	7.5	24%	-	Fix
CVE-2018-3843	High	8.8	24%	-	-
CVE-2017-3106	High	8.8	22%	-	-
CVE-2018-5007	High	8.8	18%	-	-

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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.