Critical severity9.1NVD Advisory· Published Apr 1, 2021· Updated Jun 17, 2026
CVE-2021-28918
CVE-2021-28918
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
netmasknpm | < 1.1.0 | 1.1.0 |
Affected products
3- netmask/netmaskdescription
Patches
Vulnerability mechanics
References
12- github.com/sickcodes/security/blob/master/advisories/SICK-2021-011.mdnvdExploitThird Party AdvisoryWEB
- www.bleepingcomputer.com/news/security/critical-netmask-networking-bug-impacts-thousands-of-applications/nvdExploitPress/Media CoverageThird Party Advisory
- github.com/advisories/GHSA-4c7m-wxvm-r7gcghsaADVISORY
- github.com/advisories/GHSA-pch5-whg9-qr2rnvdThird Party AdvisoryADVISORY
- nvd.nist.gov/vuln/detail/CVE-2021-28918ghsaADVISORY
- rootdaemon.com/2021/03/29/vulnerability-in-netmask-npm-package-affects-280000-projects/nvdThird Party Advisory
- security.netapp.com/advisory/ntap-20210528-0010/nvdThird Party Advisory
- www.npmjs.com/package/netmasknvdProductThird Party AdvisoryWEB
- github.com/rs/node-netmask/blob/98294cb20695f2c6c36219a4fbcd4744fb8d0682/CHANGELOG.mdghsaWEB
- rootdaemon.com/2021/03/29/vulnerability-in-netmask-npm-package-affects-280000-projectsghsaWEB
- security.netapp.com/advisory/ntap-20210528-0010ghsaWEB
- www.bleepingcomputer.com/news/security/critical-netmask-networking-bug-impacts-thousands-of-applicationsghsaWEB
News mentions
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