CVE-2021-37699: Next Open Redirect Vulnerability

MODERATE
Advisory Identifier: GHSA-vxf5-wxwp-m7g9
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CVSS 6.9
CWE-601
Published
Advisory Summary

CVE-2021-37699 is a MODERATE (CVSS 6.9) open redirect vulnerability (CWE-601: URL Redirection to Untrusted Site ('Open Redirect')) affecting Next libraries in the npm ecosystem. The issue involves open redirect in next.js. Remediation is available by upgrading affected packages to version 11.1.0.

CVE-2021-37699 at a Glance

CVE Identifier CVE-2021-37699
GHSA Identifier GHSA-vxf5-wxwp-m7g9
Severity MODERATE
CVSS v3.1 Base Score 6.9
CWE Classification CWE-601: URL Redirection to Untrusted Site ('Open Redirect')
Affected Product Next
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 6.9

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

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

How to Fix CVE-2021-37699

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

next fixed: 11.1.0 
npm install next@11.1.0
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 next

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2021-37699, inspect your project dependencies using npm:

npm ls next

Analyze the terminal output to locate any version of Next in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 11.1.0), your application is affected.

Note: The npm ls next 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 Next, 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

Next.js is an open source website development framework to be used with the React library. In affected versions specially encoded paths could be used when `pages/_error.js` was statically generated, allowing an open redirect to occur to an external site. In general, this redirect does not directly harm users although it can allow for phishing attacks by redirecting to an attacker's domain from a trusted domain. ### Impact - **Affected:** Users of Next.js between `10.0.5` and `10.2.0` - **Affected:** Users of Next.js between `11.0.0` and `11.0.1` using `pages/_error.js` without `getInitialProps` - **Affected:** Users of Next.js between `11.0.0` and `11.0.1` using `pages/_error.js` and `next export` - **Not affected**: Deployments on Vercel ([vercel.com](https://vercel.com)) are not affected - **Not affected:** Deployments **with** `pages/404.js` - Note that versions prior to 0.9.9 package `next` npm package hosted a different utility (0.4.1 being the latest version of that codebase), and this advisory does not apply to those versions. We recommend upgrading to the latest version of Next.js to improve the overall security of your application. ### Patches https://github.com/vercel/next.js/releases/tag/v11.1.0

CVE-2021-37699 Affected Next Versions

1 component(s)
Fixed Versions:
11.1.0
Product / Package Ecosystem Affected Versions Fixed Version
next
npm/next
npm
≥ 0.9.9
< 11.1.0
11.1.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/vercel/next.js/security/advisories/GHSA-vxf5-wxwp-m7g9
NVD — CVE-2021-37699 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-37699
Next Source Repository REPOSITORY
https://github.com/vercel/next.js
Next Release RELEASE
https://github.com/vercel/next.js/releases/tag/v11.1.0

Frequently Asked Questions

What is CVE-2021-37699?
CVE-2021-37699 is a security vulnerability in Next involving Open Redirect in Next.js under CWE-601: URL Redirection to Untrusted Site ('Open Redirect').
Which Next versions are affected?
Affected versions include releases prior to 11.1.0 across affected packages: next.
What version fixes CVE-2021-37699?
Upgrading to 11.1.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is next affected?
Yes, next is affected in releases prior to 11.1.0. Upgrade your dependency to 11.1.0 or later.
What is the CVSS score of CVE-2021-37699?
CVE-2021-37699 has a CVSS v3.1 base score of 6.9 (MODERATE) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:N.
What CWE is associated with CVE-2021-37699?
CVE-2021-37699 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-2021-37699?
Run the dependency tree command: 'npm ls next'. 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-vxf5-wxwp-m7g9",
  "modified" : "2022-04-28T20:32:19Z",
  "published" : "2021-08-12T14:51:14Z",
  "aliases" : [ "CVE-2021-37699" ],
  "summary" : "Open Redirect in Next.js",
  "details" : "Next.js is an open source website development framework to be used with the React library. In affected versions specially encoded paths could be used when `pages/_error.js` was statically generated, allowing an open redirect to occur to an external site. In general, this redirect does not directly harm users although it can allow for phishing attacks by redirecting to an attacker's domain from a trusted domain.\n\n### Impact\n\n- **Affected:** Users of Next.js between `10.0.5` and `10.2.0`\n- **Affected:** Users of Next.js between `11.0.0` and `11.0.1` using `pages/_error.js` without `getInitialProps`\n- **Affected:** Users of Next.js between `11.0.0` and `11.0.1` using `pages/_error.js` and `next export`\n- **Not affected**: Deployments on Vercel ([vercel.com](https://vercel.com)) are not affected\n- **Not affected:** Deployments **with** `pages/404.js`\n- Note that versions prior to 0.9.9 package `next` npm package hosted a different utility (0.4.1 being the latest version of that codebase), and this advisory does not apply to those versions.\n\nWe recommend upgrading to the latest version of Next.js to improve the overall security of your application.\n\n### Patches\n\nhttps://github.com/vercel/next.js/releases/tag/v11.1.0",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "next"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0.9.9"
      }, {
        "fixed" : "11.1.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/vercel/next.js/security/advisories/GHSA-vxf5-wxwp-m7g9"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-37699"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/vercel/next.js"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/vercel/next.js/releases/tag/v11.1.0"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-601" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-08-12T14:50:18Z",
    "nvd_published_at" : "2021-08-12T00:15:00Z"
  }
}