CVE-2021-27191: The get-ip-range package before 4.0.0 for Node.js is vulnerable to denial of service (DoS) if the range is unt

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HIGH 7.5REMOTEUPGRADE

CVE-2021-27191 is a high-severity flaw (CVSS 7.5) affecting get-ip-range. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The get-ip-range package before 4.0.0 for Node.js is vulnerable to denial of service (DoS) if the range is untrusted input. An attacker could send a large range (such as 128.0.0.0/1) that causes resource exhaustion.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.0% (top 19%)
CISA exploited list	No
Published	2021-02-11
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: get-ip-range project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-02-11 18:15 UTCPublished CVE record published
2026-06-17 03:44 UTCUpdated Record last modified

get-ip-range project get-ip-range UPGRADE

Affected: < 4.0.0

Fixed in: 4.0.0

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls get-ip-range

2. UPGRADE to 4.0.0

npm install get-ip-range@">=4.0.0"

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-27191?

get-ip-range: upgrade to 4.0.0. Exact commands for each OS are on this page.

Is CVE-2021-27191 being exploited?

CVE-2021-27191 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-27191 affect?

CVE-2021-27191 affects get-ip-range. Severity is high (CVSS 7.5). The get-ip-range package before 4.0.0 for Node.js is vulnerable to denial of service (DoS) if the range is untrusted input. An attacker could send a large range (such as 128.0.0.0/1) that causes resource exhaustion.

How urgent is CVE-2021-27191?

Priority 57/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Node.js vulnerabilities

References

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