Vulnerability Instance

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{
    "url": "http://public2.vulnerablecode.io/api/vulnerabilities/42727?format=api",
    "vulnerability_id": "VCID-echx-vz3r-ryfq",
    "summary": "Sandbox escape in notevil and argencoders-notevil\nThis affects all versions of package notevil; all versions of package argencoders-notevil. It is vulnerable to Sandbox Escape leading to Prototype pollution. The package fails to restrict access to the main context, allowing an attacker to add or modify an object's prototype. **Note:** This vulnerability derives from an incomplete fix in [SNYK-JS-NOTEVIL-608878](https://security.snyk.io/vuln/SNYK-JS-NOTEVIL-608878).",
    "aliases": [
        {
            "alias": "CVE-2021-23771"
        },
        {
            "alias": "GHSA-8g4m-cjm2-96wq"
        }
    ],
    "fixed_packages": [],
    "affected_packages": [
        {
            "url": "http://public2.vulnerablecode.io/api/packages/61020?format=api",
            "purl": "pkg:npm/argencoders-notevil@2.5.0",
            "is_vulnerable": true,
            "affected_by_vulnerabilities": [
                {
                    "vulnerability": "VCID-echx-vz3r-ryfq"
                }
            ],
            "resource_url": "http://public2.vulnerablecode.io/packages/pkg:npm/argencoders-notevil@2.5.0"
        },
        {
            "url": "http://public2.vulnerablecode.io/api/packages/61019?format=api",
            "purl": "pkg:npm/notevil@1.3.3",
            "is_vulnerable": true,
            "affected_by_vulnerabilities": [
                {
                    "vulnerability": "VCID-echx-vz3r-ryfq"
                }
            ],
            "resource_url": "http://public2.vulnerablecode.io/packages/pkg:npm/notevil@1.3.3"
        }
    ],
    "references": [
        {
            "reference_url": "https://api.first.org/data/v1/epss?cve=CVE-2021-23771",
            "reference_id": "",
            "reference_type": "",
            "scores": [
                {
                    "value": "0.00304",
                    "scoring_system": "epss",
                    "scoring_elements": "0.53975",
                    "published_at": "2026-06-04T12:55:00Z"
                }
            ],
            "url": "https://api.first.org/data/v1/epss?cve=CVE-2021-23771"
        },
        {
            "reference_url": "https://github.com/mmckegg/notevil",
            "reference_id": "",
            "reference_type": "",
            "scores": [
                {
                    "value": "6.5",
                    "scoring_system": "cvssv3.1",
                    "scoring_elements": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"
                },
                {
                    "value": "MODERATE",
                    "scoring_system": "generic_textual",
                    "scoring_elements": ""
                }
            ],
            "url": "https://github.com/mmckegg/notevil"
        },
        {
            "reference_url": "https://snyk.io/vuln/SNYK-JS-ARGENCODERSNOTEVIL-2388587",
            "reference_id": "",
            "reference_type": "",
            "scores": [
                {
                    "value": "6.5",
                    "scoring_system": "cvssv3.1",
                    "scoring_elements": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"
                },
                {
                    "value": "MODERATE",
                    "scoring_system": "generic_textual",
                    "scoring_elements": ""
                }
            ],
            "url": "https://snyk.io/vuln/SNYK-JS-ARGENCODERSNOTEVIL-2388587"
        },
        {
            "reference_url": "https://snyk.io/vuln/SNYK-JS-NOTEVIL-2385946",
            "reference_id": "",
            "reference_type": "",
            "scores": [
                {
                    "value": "6.5",
                    "scoring_system": "cvssv3.1",
                    "scoring_elements": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"
                },
                {
                    "value": "MODERATE",
                    "scoring_system": "generic_textual",
                    "scoring_elements": ""
                }
            ],
            "url": "https://snyk.io/vuln/SNYK-JS-NOTEVIL-2385946"
        },
        {
            "reference_url": "https://nvd.nist.gov/vuln/detail/CVE-2021-23771",
            "reference_id": "CVE-2021-23771",
            "reference_type": "",
            "scores": [
                {
                    "value": "6.5",
                    "scoring_system": "cvssv3.1",
                    "scoring_elements": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"
                },
                {
                    "value": "MODERATE",
                    "scoring_system": "generic_textual",
                    "scoring_elements": ""
                }
            ],
            "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-23771"
        },
        {
            "reference_url": "https://github.com/advisories/GHSA-8g4m-cjm2-96wq",
            "reference_id": "GHSA-8g4m-cjm2-96wq",
            "reference_type": "",
            "scores": [],
            "url": "https://github.com/advisories/GHSA-8g4m-cjm2-96wq"
        }
    ],
    "weaknesses": [
        {
            "cwe_id": 1035,
            "name": "OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities",
            "description": "Weaknesses in this category are related to the A9 category in the OWASP Top Ten 2017."
        },
        {
            "cwe_id": 1321,
            "name": "Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')",
            "description": "The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype."
        },
        {
            "cwe_id": 937,
            "name": "OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities",
            "description": "Weaknesses in this category are related to the A9 category in the OWASP Top Ten 2013."
        }
    ],
    "exploits": [],
    "severity_range_score": "4.0 - 6.9",
    "exploitability": "0.5",
    "weighted_severity": "6.2",
    "risk_score": 3.1,
    "resource_url": "http://public2.vulnerablecode.io/vulnerabilities/VCID-echx-vz3r-ryfq"
}