CVE-2021-28918

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.

• CWE-704

• https://github.com/advisories/GHSA-pch5-whg9-qr2rThird Party Advisory
• https://github.com/rs/node-netmaskThird Party Advisory
• https://github.com/sickcodes/security/blob/master/advisories/SICK-2021-011.mdExploit, 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/Third Party Advisory
• https://www.bleepingcomputer.com/news/security/critical-netmask-networking-bug-impacts-thousands-of-applications/Exploit, Press/Media Coverage, Third Party Advisory
• https://www.npmjs.com/package/netmaskProduct, Third Party Advisory
• https://github.com/advisories/GHSA-pch5-whg9-qr2rThird Party Advisory
• https://github.com/rs/node-netmaskThird Party Advisory
• https://github.com/sickcodes/security/blob/master/advisories/SICK-2021-011.mdExploit, 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/Third Party Advisory
• https://www.bleepingcomputer.com/news/security/critical-netmask-networking-bug-impacts-thousands-of-applications/Exploit, Press/Media Coverage, Third Party Advisory
• https://www.npmjs.com/package/netmaskProduct, Third Party Advisory

Published

Apr 1, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
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