Vulnerability Instance

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{
    "url": "http://public2.vulnerablecode.io/api/vulnerabilities/62852?format=api",
    "vulnerability_id": "VCID-qwvy-9yec-dybk",
    "summary": "The instanceof operator can bypass the Xray wrapper mechanism. When called on web content from the browser itself or an extension the web content can provide its own result for that operator, possibly tricking the browser or extension into mishandling the element.",
    "aliases": [
        {
            "alias": "CVE-2017-7820"
        }
    ],
    "fixed_packages": [
        {
            "url": "http://public2.vulnerablecode.io/api/packages/582643?format=api",
            "purl": "pkg:deb/debian/firefox@56.0-1?distro=sid",
            "is_vulnerable": false,
            "affected_by_vulnerabilities": [],
            "resource_url": "http://public2.vulnerablecode.io/packages/pkg:deb/debian/firefox@56.0-1%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"
        }
    ],
    "affected_packages": [],
    "references": [
        {
            "reference_url": "https://api.first.org/data/v1/epss?cve=CVE-2017-7820",
            "reference_id": "",
            "reference_type": "",
            "scores": [
                {
                    "value": "0.00807",
                    "scoring_system": "epss",
                    "scoring_elements": "0.74178",
                    "published_at": "2026-04-13T12:55:00Z"
                },
                {
                    "value": "0.00807",
                    "scoring_system": "epss",
                    "scoring_elements": "0.7413",
                    "published_at": "2026-04-01T12:55:00Z"
                },
                {
                    "value": "0.00807",
                    "scoring_system": "epss",
                    "scoring_elements": "0.74181",
                    "published_at": "2026-04-09T12:55:00Z"
                },
                {
                    "value": "0.00807",
                    "scoring_system": "epss",
                    "scoring_elements": "0.74202",
                    "published_at": "2026-04-11T12:55:00Z"
                },
                {
                    "value": "0.00807",
                    "scoring_system": "epss",
                    "scoring_elements": "0.74185",
                    "published_at": "2026-04-12T12:55:00Z"
                },
                {
                    "value": "0.00807",
                    "scoring_system": "epss",
                    "scoring_elements": "0.74135",
                    "published_at": "2026-04-02T12:55:00Z"
                },
                {
                    "value": "0.00807",
                    "scoring_system": "epss",
                    "scoring_elements": "0.74161",
                    "published_at": "2026-04-04T12:55:00Z"
                },
                {
                    "value": "0.00807",
                    "scoring_system": "epss",
                    "scoring_elements": "0.74133",
                    "published_at": "2026-04-07T12:55:00Z"
                },
                {
                    "value": "0.00807",
                    "scoring_system": "epss",
                    "scoring_elements": "0.74166",
                    "published_at": "2026-04-08T12:55:00Z"
                }
            ],
            "url": "https://api.first.org/data/v1/epss?cve=CVE-2017-7820"
        },
        {
            "reference_url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1378207",
            "reference_id": "",
            "reference_type": "",
            "scores": [],
            "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1378207"
        },
        {
            "reference_url": "https://www.mozilla.org/security/advisories/mfsa2017-21/",
            "reference_id": "",
            "reference_type": "",
            "scores": [],
            "url": "https://www.mozilla.org/security/advisories/mfsa2017-21/"
        },
        {
            "reference_url": "http://www.securityfocus.com/bid/101057",
            "reference_id": "",
            "reference_type": "",
            "scores": [],
            "url": "http://www.securityfocus.com/bid/101057"
        },
        {
            "reference_url": "http://www.securitytracker.com/id/1039465",
            "reference_id": "",
            "reference_type": "",
            "scores": [],
            "url": "http://www.securitytracker.com/id/1039465"
        },
        {
            "reference_url": "https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*",
            "reference_id": "cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*",
            "reference_type": "",
            "scores": [],
            "url": "https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*"
        },
        {
            "reference_url": "https://nvd.nist.gov/vuln/detail/CVE-2017-7820",
            "reference_id": "CVE-2017-7820",
            "reference_type": "",
            "scores": [
                {
                    "value": "5.0",
                    "scoring_system": "cvssv2",
                    "scoring_elements": "AV:N/AC:L/Au:N/C:N/I:P/A:N"
                },
                {
                    "value": "5.3",
                    "scoring_system": "cvssv3",
                    "scoring_elements": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"
                }
            ],
            "url": "https://nvd.nist.gov/vuln/detail/CVE-2017-7820"
        },
        {
            "reference_url": "https://www.mozilla.org/en-US/security/advisories/mfsa2017-21",
            "reference_id": "mfsa2017-21",
            "reference_type": "",
            "scores": [
                {
                    "value": "critical",
                    "scoring_system": "generic_textual",
                    "scoring_elements": ""
                }
            ],
            "url": "https://www.mozilla.org/en-US/security/advisories/mfsa2017-21"
        },
        {
            "reference_url": "https://usn.ubuntu.com/3435-1/",
            "reference_id": "USN-3435-1",
            "reference_type": "",
            "scores": [],
            "url": "https://usn.ubuntu.com/3435-1/"
        }
    ],
    "weaknesses": [],
    "exploits": [],
    "severity_range_score": "5.0 - 10.0",
    "exploitability": null,
    "weighted_severity": null,
    "risk_score": null,
    "resource_url": "http://public2.vulnerablecode.io/vulnerabilities/VCID-qwvy-9yec-dybk"
}