CVE-2021-3820: I Inflect Vulnerable To Inefficient Regular Vulnerability

HIGH
Advisory Identifier: GHSA-x55w-vjjp-222r
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CVSS 7.5
CWE-1333
Published
Advisory Summary

CVE-2021-3820 is a HIGH (CVSS 7.5) inflect vulnerable to inefficient regular vulnerability (CWE-1333: Inefficient Regular Expression Complexity) affecting I libraries in the npm ecosystem. The issue involves inflect vulnerable to inefficient regular expression complexity. Remediation is available by upgrading affected packages to version 0.3.7.

CVE-2021-3820 at a Glance

CVE Identifier CVE-2021-3820
GHSA Identifier GHSA-x55w-vjjp-222r
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-1333: Inefficient Regular Expression Complexity
Affected Product I
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 7.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity None (I:N)
Availability High (A:H)

How to Fix CVE-2021-3820

To remediate this vulnerability, upgrade all affected I dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

i fixed: 0.3.7 
npm install i@0.3.7
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls i

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2021-3820, inspect your project dependencies using npm:

npm ls i

Analyze the terminal output to locate any version of I in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.3.7), your application is affected.

Note: The npm ls i command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-1333: Inefficient Regular Expression Complexity, where the product uses a regular expression with a worst-case computational complexity that is inefficient and possibly exponential. In I, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

inflect is customizable inflections for nodejs. inflect is vulnerable to Inefficient Regular Expression Complexity

CVE-2021-3820 Affected I Versions

1 component(s)
Fixed Versions:
0.3.7
Product / Package Ecosystem Affected Versions Fixed Version
i
npm/i
npm
< 0.3.7
0.3.7

References

NVD — CVE-2021-3820 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-3820
Security Fix Commit FIX COMMIT
https://github.com/pksunkara/inflect/commit/a9a0a8e9561c3487854c7cae42565d9652ec858b
I Source Repository REPOSITORY
https://github.com/pksunkara/inflect
huntr.dev/bounties/4612b31a-0... WEB
https://huntr.dev/bounties/4612b31a-072b-4f61-a916-c7e4cbc2042a

Frequently Asked Questions

What is CVE-2021-3820?
CVE-2021-3820 is a security vulnerability in I involving inflect vulnerable to Inefficient Regular Expression Complexity under CWE-1333: Inefficient Regular Expression Complexity.
Which I versions are affected?
Affected versions include releases prior to 0.3.7 across affected packages: i.
What version fixes CVE-2021-3820?
Upgrading to 0.3.7 (or the latest patched release for your respective branch) resolves the vulnerability.
Is i affected?
Yes, i is affected in releases prior to 0.3.7. Upgrade your dependency to 0.3.7 or later.
What is the CVSS score of CVE-2021-3820?
CVE-2021-3820 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2021-3820?
CVE-2021-3820 is classified under CWE-1333: Inefficient Regular Expression Complexity (The product uses a regular expression with a worst-case computational complexity that is inefficient and possibly exponential.).
How can I check npm dependencies for CVE-2021-3820?
Run the dependency tree command: 'npm ls i'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-x55w-vjjp-222r",
  "modified" : "2022-08-10T23:43:58Z",
  "published" : "2021-09-29T17:12:19Z",
  "aliases" : [ "CVE-2021-3820" ],
  "summary" : "inflect vulnerable to Inefficient Regular Expression Complexity",
  "details" : "inflect is customizable inflections for nodejs. inflect is vulnerable to Inefficient Regular Expression Complexity",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "i"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.3.7"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-3820"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pksunkara/inflect/commit/a9a0a8e9561c3487854c7cae42565d9652ec858b"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/pksunkara/inflect"
  }, {
    "type" : "WEB",
    "url" : "https://huntr.dev/bounties/4612b31a-072b-4f61-a916-c7e4cbc2042a"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1333" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-09-28T19:27:17Z",
    "nvd_published_at" : "2021-09-27T13:15:00Z"
  }
}