CVE-2022-21721: Next Denial of Service Vulnerability

MODERATE
Advisory Identifier: GHSA-wr66-vrwm-5g5x
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CVSS 5.9
CWE-400 CWE-20
Published
Advisory Summary

CVE-2022-21721 is a MODERATE (CVSS 5.9) denial of service vulnerability (CWE-400: Uncontrolled Resource Consumption) affecting Next libraries in the npm ecosystem. The issue involves denial of service vulnerability in next.js. Remediation is available by upgrading affected packages to version 12.0.9.

CVE-2022-21721 at a Glance

CVE Identifier CVE-2022-21721
GHSA Identifier GHSA-wr66-vrwm-5g5x
Severity MODERATE
CVSS v3.1 Base Score 5.9
CWE Classification CWE-400: Uncontrolled Resource Consumption
Affected Product Next
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 5.9

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:N/S:U/C:N/I:N/A:H).

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
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-2022-21721

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: 12.0.9 
npm install next@12.0.9
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-2022-21721, 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 12.0.9), 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-400: Uncontrolled Resource Consumption, where the product does not properly control the allocation and maintenance of a limited resource. 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

### Impact Vulnerable code could allow a bad actor to trigger a denial of service attack for anyone running a Next.js app at version >= 12.0.0, and using i18n functionality. - **Affected:** All of the following must be true to be affected by this CVE - Next.js versions above v12.0.0 - Using next start or a custom server - Using the built-in i18n support - **Not affected:** - Deployments on Vercel (vercel.com) are not affected along with similar environments where invalid requests are filtered before reaching Next.js. ### Patches A patch has been released, `next@12.0.9`, that mitigates this issue. We recommend all affected users upgrade as soon as possible. ### Workarounds We recommend upgrading whether you can reproduce or not although you can ensure `/${locale}/_next/` is blocked from reaching the Next.js instance until you upgrade. ### For more information If you have any questions or comments about this advisory: * Open an issue in [next](https://github.com/vercel/next.js) * Email us at [security@vercel.com](mailto:security@vercel.com)

CVE-2022-21721 Affected Next Versions

1 component(s)
Fixed Versions:
12.0.9
Product / Package Ecosystem Affected Versions Fixed Version
next
npm/next
npm
≥ 12.0.0
< 12.0.9
12.0.9

References

GitHub Advisory / Wiki ADVISORY
https://github.com/vercel/next.js/security/advisories/GHSA-wr66-vrwm-5g5x
NVD — CVE-2022-21721 NVD
https://nvd.nist.gov/vuln/detail/CVE-2022-21721
Next Source Repository REPOSITORY
https://github.com/vercel/next.js/pull/33503
Next Source Repository REPOSITORY
https://github.com/vercel/next.js
Next Release RELEASE
https://github.com/vercel/next.js/releases/tag/v12.0.9

Frequently Asked Questions

What is CVE-2022-21721?
CVE-2022-21721 is a security vulnerability in Next involving Denial of Service Vulnerability in next.js under CWE-400: Uncontrolled Resource Consumption.
Which Next versions are affected?
Affected versions include releases prior to 12.0.9 across affected packages: next.
What version fixes CVE-2022-21721?
Upgrading to 12.0.9 (or the latest patched release for your respective branch) resolves the vulnerability.
Is next affected?
Yes, next is affected in releases prior to 12.0.9. Upgrade your dependency to 12.0.9 or later.
What is the CVSS score of CVE-2022-21721?
CVE-2022-21721 has a CVSS v3.1 base score of 5.9 (MODERATE) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2022-21721?
CVE-2022-21721 is classified under CWE-400: Uncontrolled Resource Consumption (The product does not properly control the allocation and maintenance of a limited resource.).
How can I check npm dependencies for CVE-2022-21721?
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-wr66-vrwm-5g5x",
  "modified" : "2022-02-07T21:17:29Z",
  "published" : "2022-01-28T23:09:22Z",
  "aliases" : [ "CVE-2022-21721" ],
  "summary" : "Denial of Service Vulnerability in next.js",
  "details" : "### Impact\n\nVulnerable code could allow a bad actor to trigger a denial of service attack for anyone running a Next.js app at version >= 12.0.0, and using i18n functionality.\n\n- **Affected:** All of the following must be true to be affected by this CVE\n  - Next.js versions above v12.0.0\n  - Using next start or a custom server\n  - Using the built-in i18n support\n- **Not affected:**\n  - Deployments on Vercel (vercel.com) are not affected along with similar environments where invalid requests are filtered before reaching Next.js.\n\n### Patches\n\nA patch has been released, `next@12.0.9`, that mitigates this issue. We recommend all affected users upgrade as soon as possible.\n\n### Workarounds\n\nWe recommend upgrading whether you can reproduce or not although you can ensure `/${locale}/_next/` is blocked from reaching the Next.js instance until you upgrade.\n\n### For more information\n\nIf you have any questions or comments about this advisory:\n* Open an issue in [next](https://github.com/vercel/next.js)\n* Email us at [security@vercel.com](mailto:security@vercel.com)\n",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "next"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "12.0.0"
      }, {
        "fixed" : "12.0.9"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/vercel/next.js/security/advisories/GHSA-wr66-vrwm-5g5x"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2022-21721"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/vercel/next.js/pull/33503"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/vercel/next.js"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/vercel/next.js/releases/tag/v12.0.9"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-20", "CWE-400" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-01-28T18:52:54Z",
    "nvd_published_at" : "2022-01-28T22:15:00Z"
  }
}