FKIE_CVE-2021-32640

Vulnerability from fkie_nvd - Published: 2021-05-25 19:15 - Updated: 2026-06-17 03:53
Severity
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Summary
ws is an open source WebSocket client and server library for Node.js. A specially crafted value of the `Sec-Websocket-Protocol` header can be used to significantly slow down a ws server. The vulnerability has been fixed in ws@7.4.6 (https://github.com/websockets/ws/commit/00c425ec77993773d823f018f64a5c44e17023ff). In vulnerable versions of ws, the issue can be mitigated by reducing the maximum allowed length of the request headers using the [`--max-http-header-size=size`](https://nodejs.org/api/cli.html#cli_max_http_header_size_size) and/or the [`maxHeaderSize`](https://nodejs.org/api/http.html#http_http_createserver_options_requestlistener) options.
References
security-advisories@github.comhttps://github.com/websockets/ws/commit/00c425ec77993773d823f018f64a5c44e17023ffPatch, Third Party Advisory
security-advisories@github.comhttps://github.com/websockets/ws/security/advisories/GHSA-6fc8-4gx4-v693Exploit, Mitigation, Patch, Third Party Advisory
security-advisories@github.comhttps://lists.apache.org/thread.html/rdfa7b6253c4d6271e31566ecd5f30b7ce1b8fb2c89d52b8c4e0f4e30%40%3Ccommits.tinkerpop.apache.org%3E
security-advisories@github.comhttps://security.netapp.com/advisory/ntap-20210706-0005/Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/websockets/ws/commit/00c425ec77993773d823f018f64a5c44e17023ffPatch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/websockets/ws/security/advisories/GHSA-6fc8-4gx4-v693Exploit, Mitigation, Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.apache.org/thread.html/rdfa7b6253c4d6271e31566ecd5f30b7ce1b8fb2c89d52b8c4e0f4e30%40%3Ccommits.tinkerpop.apache.org%3E
af854a3a-2127-422b-91ae-364da2661108https://security.netapp.com/advisory/ntap-20210706-0005/Third Party Advisory
Impacted products
Vendor Product Version
ws_project ws *
ws_project ws *
netapp e-series_performance_analyzer -
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "ws",
          "vendor": "websockets",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 5.0.0 \u003c= 7.4.5"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:ws_project:ws:*:*:*:*:*:node.js:*:*",
              "matchCriteriaId": "17BC31A7-9CB8-47EC-89C4-A4809CE9E47D",
              "versionEndExcluding": "6.2.2",
              "versionStartIncluding": "5.0.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:ws_project:ws:*:*:*:*:*:node.js:*:*",
              "matchCriteriaId": "5CCD3F79-60EA-49AB-B02C-327182F655A8",
              "versionEndExcluding": "7.4.6",
              "versionStartIncluding": "7.0.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    },
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:netapp:e-series_performance_analyzer:-:*:*:*:*:*:*:*",
              "matchCriteriaId": "24B8DB06-590A-4008-B0AB-FCD1401C77C6",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "ws is an open source WebSocket client and server library for Node.js. A specially crafted value of the `Sec-Websocket-Protocol` header can be used to significantly slow down a ws server. The vulnerability has been fixed in ws@7.4.6 (https://github.com/websockets/ws/commit/00c425ec77993773d823f018f64a5c44e17023ff). In vulnerable versions of ws, the issue can be mitigated by reducing the maximum allowed length of the request headers using the [`--max-http-header-size=size`](https://nodejs.org/api/cli.html#cli_max_http_header_size_size) and/or the [`maxHeaderSize`](https://nodejs.org/api/http.html#http_http_createserver_options_requestlistener) options."
    },
    {
      "lang": "es",
      "value": "ws es una biblioteca de servidor y cliente WebSocket de c\u00f3digo abierto para Node.js.\u0026#xa0;Un valor especialmente dise\u00f1ado del encabezado \"Sec-Websocket-Protocol\" puede ser usado para ralentizar significativamente un servidor ws.\u0026#xa0;La vulnerabilidad ha sido corregida en la versi\u00f3n ws@7.4.6 (https://github.com/websockets/ws/commit/00c425ec77993773d823f018f64a5c44e17023ff).\u0026#xa0;En las versiones vulnerables de ws, el problema puede ser mitigado al reducir la longitud m\u00e1xima permitida de los encabezados de petici\u00f3n utilizando [`--max-http-header-size=size`](https://nodejs.org/api/cli.html#cli_max_http_header_size_size) y/o las opciones [`maxHeaderSize`](https://nodejs.org/api/http.html#http_http_createserver_options_requestlistener)"
    }
  ],
  "id": "CVE-2021-32640",
  "lastModified": "2026-06-17T03:53:19.733",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "PARTIAL",
          "baseScore": 5.0,
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
          "version": "2.0"
        },
        "exploitabilityScore": 10.0,
        "impactScore": 2.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 1.4,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 1.4,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2021-05-25T19:15:07.767",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://github.com/websockets/ws/commit/00c425ec77993773d823f018f64a5c44e17023ff"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Mitigation",
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://github.com/websockets/ws/security/advisories/GHSA-6fc8-4gx4-v693"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://lists.apache.org/thread.html/rdfa7b6253c4d6271e31566ecd5f30b7ce1b8fb2c89d52b8c4e0f4e30%40%3Ccommits.tinkerpop.apache.org%3E"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://security.netapp.com/advisory/ntap-20210706-0005/"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://github.com/websockets/ws/commit/00c425ec77993773d823f018f64a5c44e17023ff"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Exploit",
        "Mitigation",
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://github.com/websockets/ws/security/advisories/GHSA-6fc8-4gx4-v693"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://lists.apache.org/thread.html/rdfa7b6253c4d6271e31566ecd5f30b7ce1b8fb2c89d52b8c4e0f4e30%40%3Ccommits.tinkerpop.apache.org%3E"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://security.netapp.com/advisory/ntap-20210706-0005/"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-400"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-400"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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