Vulnerability-Lookup

FKIE_CVE-2021-23436

Vulnerability from fkie_nvd - Published: 2021-09-01 18:15 - Updated: 2026-06-17 03:38

Severity

5.6 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

This affects the package immer before 9.0.6. A type confusion vulnerability can lead to a bypass of CVE-2020-28477 when the user-provided keys used in the path parameter are arrays. In particular, this bypass is possible because the condition (p === "__proto__" || p === "constructor") in applyPatches_ returns false if p is ['__proto__'] (or ['constructor']). The === operator (strict equality operator) returns false if the operands have different type.

References

URL	Tags
report@snyk.io	https://github.com/immerjs/immer/commit/fa671e55ee9bd42ae08cc239102b665a23958237	Patch, Third Party Advisory
report@snyk.io	https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1579266	Exploit, Patch, Third Party Advisory
report@snyk.io	https://snyk.io/vuln/SNYK-JS-IMMER-1540542	Exploit, Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://github.com/immerjs/immer/commit/fa671e55ee9bd42ae08cc239102b665a23958237	Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1579266	Exploit, Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://snyk.io/vuln/SNYK-JS-IMMER-1540542	Exploit, Patch, Third Party Advisory

Impacted products

	Vendor	Product	Version
	immer_project	immer	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "immer",
          "vendor": "n/a",
          "versions": [
            {
              "lessThan": "9.0.6",
              "status": "affected",
              "version": "unspecified",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "report@snyk.io"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:immer_project:immer:*:*:*:*:*:node.js:*:*",
              "matchCriteriaId": "701ACA7B-8499-4CCB-A259-D15A38C2EDC0",
              "versionEndExcluding": "9.0.6",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "This affects the package immer before 9.0.6. A type confusion vulnerability can lead to a bypass of CVE-2020-28477 when the user-provided keys used in the path parameter are arrays. In particular, this bypass is possible because the condition (p === \"__proto__\" || p === \"constructor\") in applyPatches_ returns false if p is [\u0027__proto__\u0027] (or [\u0027constructor\u0027]). The === operator (strict equality operator) returns false if the operands have different type."
    },
    {
      "lang": "es",
      "value": "Esto afecta al paquete immer versiones anteriores a 9.0.6. Una vulnerabilidad de confusi\u00f3n de tipo puede conllevar a una omisi\u00f3n  de CVE-2020-28477 cuando las claves proporcionadas por el usuario usadas en el par\u00e1metro de la ruta son matrices. En particular, esta omisi\u00f3n es posible porque la condici\u00f3n (p === \"__proto__\" || p === \"constructor\") en applyPatches_ devuelve false si p es [\"__proto__\"] (o [\"constructor\"]). El operador === (operador de igualdad estricta) devuelve false si los operandos tienen distinto tipo"
    }
  ],
  "id": "CVE-2021-23436",
  "lastModified": "2026-06-17T03:38:45.597",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "HIGH",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "PARTIAL",
          "baseScore": 7.5,
          "confidentialityImpact": "PARTIAL",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P",
          "version": "2.0"
        },
        "exploitabilityScore": 10.0,
        "impactScore": 6.4,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 5.6,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 3.4,
        "source": "report@snyk.io",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2021-09-01T18:15:08.477",
  "references": [
    {
      "source": "report@snyk.io",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://github.com/immerjs/immer/commit/fa671e55ee9bd42ae08cc239102b665a23958237"
    },
    {
      "source": "report@snyk.io",
      "tags": [
        "Exploit",
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1579266"
    },
    {
      "source": "report@snyk.io",
      "tags": [
        "Exploit",
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://snyk.io/vuln/SNYK-JS-IMMER-1540542"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://github.com/immerjs/immer/commit/fa671e55ee9bd42ae08cc239102b665a23958237"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Exploit",
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1579266"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Exploit",
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://snyk.io/vuln/SNYK-JS-IMMER-1540542"
    }
  ],
  "sourceIdentifier": "report@snyk.io",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-843"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2021-23436 (GCVE-0-2021-23436)

Vulnerability from cvelistv5 – Published: 2021-09-01 17:30 – Updated: 2024-09-16 16:28

Title

Prototype Pollution

Summary

Severity

5.6 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C

CWE

Prototype Pollution

Assigner

snyk mitre root

References

3 references

URL	Tags
https://snyk.io/vuln/SNYK-JS-IMMER-1540542	x_refsource_MISC
https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1579266	x_refsource_MISC
https://github.com/immerjs/immer/commit/fa671e55e…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
n/a	immer	Affected: unspecified , < 9.0.6 (custom)

Date Public

2021-09-01 00:00

Credits

Alessio Della Libera of Snyk Research Team

Show details on NVD website

JSON

To clipboard

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        "references": [
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            "tags": [
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              "x_transferred"
            ],
            "url": "https://snyk.io/vuln/SNYK-JS-IMMER-1540542"
          },
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            ],
            "url": "https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1579266"
          },
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            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/immerjs/immer/commit/fa671e55ee9bd42ae08cc239102b665a23958237"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "immer",
          "vendor": "n/a",
          "versions": [
            {
              "lessThan": "9.0.6",
              "status": "affected",
              "version": "unspecified",
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      "credits": [
        {
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      ],
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      "descriptions": [
        {
          "lang": "en",
          "value": "This affects the package immer before 9.0.6. A type confusion vulnerability can lead to a bypass of CVE-2020-28477 when the user-provided keys used in the path parameter are arrays. In particular, this bypass is possible because the condition (p === \"__proto__\" || p === \"constructor\") in applyPatches_ returns false if p is [\u0027__proto__\u0027] (or [\u0027constructor\u0027]). The === operator (strict equality operator) returns false if the operands have different type."
        }
      ],
      "metrics": [
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            "remediationLevel": "OFFICIAL_FIX",
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            "scope": "UNCHANGED",
            "temporalScore": 5.1,
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      ],
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                          {
                            "version_affected": "\u003c",
                            "version_value": "9.0.6"
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                "vendor_name": "n/a"
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}

Sightings

Author	Source	Type	Date	Other

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.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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FKIE_CVE-2021-23436

CVE-2021-23436 (GCVE-0-2021-23436)

Tags

Sightings

Nomenclature

Related by attack behaviour