CVE-2021-29418

Name: CVE-2021-29418
Creator: NVD / NIST
Published: 2021-03-30T07:15:13.113+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 1.68%

Last modified Jun 17, 2026

CVE-2021-29418 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. 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. EPSS estimates a 1.68% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.3/10

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

EPSS Probability

1.68%

74.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-20

Affected Software

Vendor	Product	Versions
Netmask Project	Netmask	< 2.0.1

References

https://github.com/rs/node-netmask/commit/3f19a056c4eb808ea4a29f234274c67bc5a848f4Patch, Third Party Advisory
https://security.netapp.com/advisory/ntap-20210604-0001/Third Party Advisory
https://vuln.ryotak.me/advisories/6Third Party Advisory
https://github.com/rs/node-netmask/commit/3f19a056c4eb808ea4a29f234274c67bc5a848f4Patch, Third Party Advisory
https://security.netapp.com/advisory/ntap-20210604-0001/Third Party Advisory
https://vuln.ryotak.me/advisories/6Third Party Advisory

Timeline

Published: Mar 30, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-29418?

How severe is CVE-2021-29418?

CVE-2021-29418 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 1.68% probability of exploitation in the next 30 days.

How do I fix CVE-2021-29418?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-29418?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST