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.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 16.7%, higher than 97% of all known CVEs. Patch or mitigate before the next change window.
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.
- CVSS 3.1
- 9.1 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
- EPSS
- 16.66% probability · 97th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-704
- Affected
- netmask project/netmask
- Source
- cve@mitre.org
EPSS 16.7% since 26 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- 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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.