CVE-2021-28918

CRITICAL NUCLEI

Netmask < 1.0.6 - SSRF

Title source: rule

Description

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.

Nuclei Templates (1)

Netmask NPM Package - Server-Side Request Forgery

CRITICALby johnjhacking

References (7)

[Third Party Advisory] https://github.com/advisories/GHSA-pch5-whg9-qr2r

[Third Party Advisory] https://github.com/rs/node-netmask

View Writeup ZIP pw:eip

[Exploit, Third Party Advisory] https://github.com/sickcodes/security/blob/master/advisories/SICK-2021-011.md

[Third Party Advisory] https://rootdaemon.com/2021/03/29/vulnerability-in-netmask-npm-package-affects-280000-projects/

[Third Party Advisory] https://security.netapp.com/advisory/ntap-20210528-0010/

[Exploit, Press/Media Coverage, Third Party Advisory] https://www.bleepingcomputer.com/news/security/critical-netmask-networking-bug-impacts-thousands-of-applications/

[Product, Third Party Advisory] https://www.npmjs.com/package/netmask

Scores

CVSS v3 9.1

EPSS 0.8590

EPSS Percentile 99.4%

Attack Vector NETWORK

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

Details

CWE

CWE-704

Status published

Products (2)

netmask_project/netmask < 1.0.6

npm/netmask 0 - 1.1.0npm

Published Apr 01, 2021

Tracked Since Feb 18, 2026