CVE-2021-28918

Netmask vulnerability

CVSS

9.1

EPSS

16.7%

EPSS pct

97th

Exploited

No known

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.

Affected vendor

Netmask Project

Affected product

Netmask

CVSS vector

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

Weakness type (CWE)

CWE-704

Published

2021-04-01

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to confidentiality, high impact to integrity.

Its EPSS score of 16.7% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 97% of all scored CVEs.

Check your external exposure to CVE-2021-28918

Confirm whether Netmask Project Netmask is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2021-28918.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2021-28918

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2021-28918 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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CRITICAL

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