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CVE-2021-29418

20
FAUCET Score

CVE-2021-29418 is a vulnerability in the Node.js netmask package (versions prior to 2.0.1) that allows attackers to bypass IP-based access controls due to improper handling of unexpected characters in IP address strings. This medium-severity vulnerability (CVSS 5.3) has a low attack complexity and can lead to unauthorized access, though it does not impact confidentiality, integrity, or availability. While there is no evidence of active exploitation or public exploit code, the vulnerability has garnered significant community discussion and media coverage, indicating awareness within the cybersecurity community.

Impacted Technologies

VendorProductVersion(s)CPE
< 2.0.1CPE matchmatch criteria
cpe:2.3:a:netmask_project:netmask:*:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.68%
Probability of exploitation in next 30 days
EPSS Percentile
74.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0168 is in the 60th percentile among its peer group of 23,701 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (5)

github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: netmaskFixed in: 2.0.1
redhatvendor investigatingvia redhat_api
Product: Red Hat Advanced Cluster Management for Kubernetes 2Fixed in: rhacm2/application-ui-rhel8
redhatno patchvia redhat_api
Product: Red Hat Advanced Cluster Management for Kubernetes 2Fixed in: rhacm2/grc-ui-rhel8
redhatno patchvia redhat_api
Product: Red Hat Advanced Cluster Management for Kubernetes 2Fixed in: rhacm2/mcm-topology-rhel8

Vendor Advisories (2)

npmGHSA-pch5-whg9-qr2rmedium

netmask npm package mishandles octal input data

Mar 29, 2021
redhatCVE-2021-29418Moderate

nodejs-netmask: incorrectly parses an IP address that has octal integer with invalid character

Mar 29, 2021

References

github.com / rs/node-netmask/commit/3f19a056c4eb808ea4a29f234274c67bc5a848f4
PatchThird Party Advisory
security.netapp.com / advisory/ntap-20210604-0001
Third Party Advisory
vuln.ryotak.me / advisories/6
Third Party Advisory