CVE-2021-3664: Url parse Open Redirect Vulnerability

MODERATE
Advisory Identifier: GHSA-hh27-ffr2-f2jc
Share
CVSS 6.1
CWE-601
Published
Advisory Summary

CVE-2021-3664 is a MODERATE (CVSS 6.1) open redirect vulnerability (CWE-601: URL Redirection to Untrusted Site ('Open Redirect')) affecting Url parse libraries in the npm ecosystem. The issue involves open redirect in url-parse. Remediation is available by upgrading affected packages to version 1.5.2.

CVE-2021-3664 at a Glance

CVE Identifier CVE-2021-3664
GHSA Identifier GHSA-hh27-ffr2-f2jc
Severity MODERATE
CVSS v3.1 Base Score 6.1
CWE Classification CWE-601: URL Redirection to Untrusted Site ('Open Redirect')
Affected Product Url parse
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 6.1

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:R/S:C/C:L/I:L/A:N).

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

How to Fix CVE-2021-3664

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

url-parse fixed: 1.5.2 
npm install url-parse@1.5.2
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 url-parse

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2021-3664, inspect your project dependencies using npm:

npm ls url-parse

Analyze the terminal output to locate any version of Url parse in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.5.2), your application is affected.

Note: The npm ls url-parse 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-601: URL Redirection to Untrusted Site ('Open Redirect'), where the web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect. In Url parse, 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

# Overview Affected versions of npm `url-parse` are vulnerable to URL Redirection to Untrusted Site. # Impact Depending on library usage and attacker intent, impacts may include allow/block list bypasses, SSRF attacks, open redirects, or other undesired behavior.

CVE-2021-3664 Affected Url parse Versions

1 component(s)
Fixed Versions:
1.5.2
Product / Package Ecosystem Affected Versions Fixed Version
url-parse
npm/url-parse
npm
≥ 0.1.0
< 1.5.2
1.5.2

References

NVD — CVE-2021-3664 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-3664
Url parse Source Repository REPOSITORY
https://github.com/unshiftio/url-parse/issues/205
Url parse Source Repository REPOSITORY
https://github.com/unshiftio/url-parse/issues/206
Url parse Source Repository REPOSITORY
https://github.com/github/advisory-database/pull/6764
Security Fix Commit FIX COMMIT
https://github.com/unshiftio/url-parse/commit/81ab967889b08112d3356e451bf03e6aa0cbb7e0
Url parse Source Repository REPOSITORY
https://github.com/unshiftio/url-parse
huntr.dev/bounties/1625557993... WEB
https://huntr.dev/bounties/1625557993985-unshiftio/url-parse
lists.debian.org/debian-lts-announce... WEB
https://lists.debian.org/debian-lts-announce/2023/02/msg00030.html

Frequently Asked Questions

What is CVE-2021-3664?
CVE-2021-3664 is a security vulnerability in Url parse involving Open redirect in url-parse under CWE-601: URL Redirection to Untrusted Site ('Open Redirect').
Which Url parse versions are affected?
Affected versions include releases prior to 1.5.2 across affected packages: url-parse.
What version fixes CVE-2021-3664?
Upgrading to 1.5.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is url-parse affected?
Yes, url-parse is affected in releases prior to 1.5.2. Upgrade your dependency to 1.5.2 or later.
What is the CVSS score of CVE-2021-3664?
CVE-2021-3664 has a CVSS v3.1 base score of 6.1 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
What CWE is associated with CVE-2021-3664?
CVE-2021-3664 is classified under CWE-601: URL Redirection to Untrusted Site ('Open Redirect') (The web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect.).
How can I check npm dependencies for CVE-2021-3664?
Run the dependency tree command: 'npm ls url-parse'. 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-hh27-ffr2-f2jc",
  "modified" : "2026-02-03T22:12:27Z",
  "published" : "2021-08-10T16:07:08Z",
  "aliases" : [ "CVE-2021-3664" ],
  "summary" : "Open redirect in url-parse",
  "details" : "# Overview\n\nAffected versions of npm `url-parse` are vulnerable to URL Redirection to Untrusted Site.\n\n# Impact\n\nDepending on library usage and attacker intent, impacts may include allow/block list bypasses, SSRF attacks, open redirects, or other undesired behavior.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "url-parse"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0.1.0"
      }, {
        "fixed" : "1.5.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-3664"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/unshiftio/url-parse/issues/205"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/unshiftio/url-parse/issues/206"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/github/advisory-database/pull/6764"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/unshiftio/url-parse/commit/81ab967889b08112d3356e451bf03e6aa0cbb7e0"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/unshiftio/url-parse"
  }, {
    "type" : "WEB",
    "url" : "https://huntr.dev/bounties/1625557993985-unshiftio/url-parse"
  }, {
    "type" : "WEB",
    "url" : "https://lists.debian.org/debian-lts-announce/2023/02/msg00030.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-601" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-08-02T21:28:20Z",
    "nvd_published_at" : "2021-07-26T12:15:00Z"
  }
}