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Vulnerability record · CVE-2021-29418 · published 30 March 2021

CVE-2021-29418: Netmask project netmask improper input validation vulnerability

Netmask Project · Netmask

The netmask package before 2.0.1 for Node.js mishandles certain unexpected characters in an IP address string, such as an octal digit of 9. This (in some situations) allows attackers to bypass access control that is based on IP addresses. NOTE: this issue exists because of an incomplete fix for CVE-2021-28918.

5.3 CVSS 3.1 Medium EPSS 1.7% · top 24.0% CWE-20 · Improper input validation
5.3CVSS 3.1 base score, v2 5.0
1.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

Description

The netmask package before 2.0.1 for Node.js mishandles certain unexpected characters in an IP address string, such as an octal digit of 9. This (in some situations) allows attackers to bypass access control that is based on IP addresses. NOTE: this issue exists because of an incomplete fix for CVE-2021-28918.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-29418), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.