Vulnerability Instance

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{
    "url": "http://public2.vulnerablecode.io/api/vulnerabilities/63237?format=api",
    "vulnerability_id": "VCID-z29z-sf3c-3ubb",
    "summary": "When parsing internationalized domain names, high bits of the characters in the URLs were sometimes stripped, resulting in inconsistencies that could lead to user confusion or attacks such as phishing.",
    "aliases": [
        {
            "alias": "CVE-2021-43533"
        }
    ],
    "fixed_packages": [
        {
            "url": "http://public2.vulnerablecode.io/api/packages/584097?format=api",
            "purl": "pkg:deb/debian/firefox@94.0-1?distro=sid",
            "is_vulnerable": false,
            "affected_by_vulnerabilities": [],
            "resource_url": "http://public2.vulnerablecode.io/packages/pkg:deb/debian/firefox@94.0-1%3Fdistro=sid"
        },
        {
            "url": "http://public2.vulnerablecode.io/api/packages/582059?format=api",
            "purl": "pkg:deb/debian/firefox@149.0-1?distro=sid",
            "is_vulnerable": false,
            "affected_by_vulnerabilities": [],
            "resource_url": "http://public2.vulnerablecode.io/packages/pkg:deb/debian/firefox@149.0-1%3Fdistro=sid"
        },
        {
            "url": "http://public2.vulnerablecode.io/api/packages/1059611?format=api",
            "purl": "pkg:deb/debian/firefox@149.0.2-1?distro=sid",
            "is_vulnerable": false,
            "affected_by_vulnerabilities": [],
            "resource_url": "http://public2.vulnerablecode.io/packages/pkg:deb/debian/firefox@149.0.2-1%3Fdistro=sid"
        },
        {
            "url": "http://public2.vulnerablecode.io/api/packages/1076056?format=api",
            "purl": "pkg:deb/debian/firefox@150.0-1?distro=sid",
            "is_vulnerable": false,
            "affected_by_vulnerabilities": [],
            "resource_url": "http://public2.vulnerablecode.io/packages/pkg:deb/debian/firefox@150.0-1%3Fdistro=sid"
        }
    ],
    "affected_packages": [],
    "references": [
        {
            "reference_url": "https://api.first.org/data/v1/epss?cve=CVE-2021-43533",
            "reference_id": "",
            "reference_type": "",
            "scores": [
                {
                    "value": "0.00186",
                    "scoring_system": "epss",
                    "scoring_elements": "0.40197",
                    "published_at": "2026-04-24T12:55:00Z"
                },
                {
                    "value": "0.00186",
                    "scoring_system": "epss",
                    "scoring_elements": "0.40356",
                    "published_at": "2026-04-12T12:55:00Z"
                },
                {
                    "value": "0.00186",
                    "scoring_system": "epss",
                    "scoring_elements": "0.40336",
                    "published_at": "2026-04-13T12:55:00Z"
                },
                {
                    "value": "0.00186",
                    "scoring_system": "epss",
                    "scoring_elements": "0.40352",
                    "published_at": "2026-04-18T12:55:00Z"
                },
                {
                    "value": "0.00186",
                    "scoring_system": "epss",
                    "scoring_elements": "0.40276",
                    "published_at": "2026-04-21T12:55:00Z"
                },
                {
                    "value": "0.00186",
                    "scoring_system": "epss",
                    "scoring_elements": "0.40319",
                    "published_at": "2026-04-07T12:55:00Z"
                },
                {
                    "value": "0.00186",
                    "scoring_system": "epss",
                    "scoring_elements": "0.4037",
                    "published_at": "2026-04-08T12:55:00Z"
                },
                {
                    "value": "0.00186",
                    "scoring_system": "epss",
                    "scoring_elements": "0.40382",
                    "published_at": "2026-04-16T12:55:00Z"
                },
                {
                    "value": "0.00186",
                    "scoring_system": "epss",
                    "scoring_elements": "0.40393",
                    "published_at": "2026-04-11T12:55:00Z"
                },
                {
                    "value": "0.00284",
                    "scoring_system": "epss",
                    "scoring_elements": "0.51707",
                    "published_at": "2026-04-01T12:55:00Z"
                },
                {
                    "value": "0.00284",
                    "scoring_system": "epss",
                    "scoring_elements": "0.51756",
                    "published_at": "2026-04-02T12:55:00Z"
                },
                {
                    "value": "0.00284",
                    "scoring_system": "epss",
                    "scoring_elements": "0.51782",
                    "published_at": "2026-04-04T12:55:00Z"
                }
            ],
            "url": "https://api.first.org/data/v1/epss?cve=CVE-2021-43533"
        },
        {
            "reference_url": "https://www.mozilla.org/en-US/security/advisories/mfsa2021-48",
            "reference_id": "mfsa2021-48",
            "reference_type": "",
            "scores": [
                {
                    "value": "high",
                    "scoring_system": "generic_textual",
                    "scoring_elements": ""
                }
            ],
            "url": "https://www.mozilla.org/en-US/security/advisories/mfsa2021-48"
        }
    ],
    "weaknesses": [],
    "exploits": [],
    "severity_range_score": "7.0 - 8.9",
    "exploitability": null,
    "weighted_severity": null,
    "risk_score": null,
    "resource_url": "http://public2.vulnerablecode.io/vulnerabilities/VCID-z29z-sf3c-3ubb"
}