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CVE-2021-29418

MEDIUM
5.3
CVSS Score
Published: March 30, 2021 at 06:08 AM UTC
Updated: June 17, 2026 at 03:47 AM UTC
1 product affected across 1 vendorNetmask

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Severity
MEDIUM5.3
Exploit prediction
EPSS 2%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Netmask· Netmask Projectnpm
95%
v < 2.0.1
Affected range stops below 2.0.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/rs/node-netmask/commit/3f19a056c4eb808ea4a29f234274c67bc5a848f4
x_refsource_CONFIRMThird Party Advisory
Source: [email protected]
https://security.netapp.com/advisory/ntap-20210604-0001/
x_refsource_MISCThird Party Advisory
Source: [email protected]
https://vuln.ryotak.me/advisories/6

CVSS

5.3MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-20

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