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Vulnerability record · public intelligence
CVE-2021-28918
UNKNOWN

Improper parsing of octal bytes in netmask

Published Apr 1, 2021 · Updated Nov 3, 2026

Severity · CVSSUNKNOWN · Not scored
Known exploitationNot listed
EPSS / likelihood15.04%
QFinch risk scoreNot available

Original summary

Normalized public record · Updated Nov 3, 2026

Improper parsing of octal bytes in netmask

Publisher and source text is retained separately from QFinch interpretation.

QFinch assessment

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.

Evidence: public source records

Affected products

Affected scope reported by the available public evidence
Affected package, product or rangeFix status
Consult the referenced vendor advisory for affected versions.Consult source advisory

Matching a version is only one part of assessing exposure. QFinch has not assessed your environment on this public page.

Remediation

Apply the vendor-supported fixed release or mitigation, then verify the affected component is no longer reachable.

  1. Confirm the affected product and reachable code path exist in your environment.
  2. Apply the vendor-supported patch or mitigation from the primary advisory.
  3. Rescan the exact deployed revision and retain verification evidence.
Review primary references

Evidence coverage

FIRST-EPSSCVE-LIST-V5
SSVC priority
MEDIUM
Confidence
Not available
Aliases
None reported

Scores appear only when corresponding evidence exists. Missing data is never interpreted as zero risk.

Sources and record history

  1. www.npmjs.com ↗
  2. Source repository ↗
  3. www.bleepingcomputer.com ↗
  4. Source repository ↗
  5. Source repository ↗
  6. security.netapp.com ↗
  7. rootdaemon.com ↗

Record history

Published Apr 1, 2021 · Last refreshed Nov 3, 2026

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