Vulnerability Instance

HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "url": "http://public2.vulnerablecode.io/api/vulnerabilities/63235?format=api",
    "vulnerability_id": "VCID-5tg2-vh52-5yhc",
    "summary": "When a user loaded a Web Extensions context menu, the Web Extension could access the post-redirect URL of the element clicked.  If the Web Extension lacked the WebRequest permission for the hosts involved in the redirect, this would be a same-origin-violation leaking data the Web Extension should have access to.  This was fixed to provide the pre-redirect URL. This is related to CVE-2021-43532 but in the context of Web Extensions.",
    "aliases": [
        {
            "alias": "CVE-2021-43531"
        }
    ],
    "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-2021-43531",
            "reference_id": "",
            "reference_type": "",
            "scores": [
                {
                    "value": "0.00085",
                    "scoring_system": "epss",
                    "scoring_elements": "0.24624",
                    "published_at": "2026-04-24T12:55:00Z"
                },
                {
                    "value": "0.00085",
                    "scoring_system": "epss",
                    "scoring_elements": "0.24698",
                    "published_at": "2026-04-13T12:55:00Z"
                },
                {
                    "value": "0.00085",
                    "scoring_system": "epss",
                    "scoring_elements": "0.24712",
                    "published_at": "2026-04-16T12:55:00Z"
                },
                {
                    "value": "0.00085",
                    "scoring_system": "epss",
                    "scoring_elements": "0.24704",
                    "published_at": "2026-04-18T12:55:00Z"
                },
                {
                    "value": "0.00085",
                    "scoring_system": "epss",
                    "scoring_elements": "0.24683",
                    "published_at": "2026-04-21T12:55:00Z"
                },
                {
                    "value": "0.00085",
                    "scoring_system": "epss",
                    "scoring_elements": "0.24667",
                    "published_at": "2026-04-07T12:55:00Z"
                },
                {
                    "value": "0.00085",
                    "scoring_system": "epss",
                    "scoring_elements": "0.24735",
                    "published_at": "2026-04-08T12:55:00Z"
                },
                {
                    "value": "0.00085",
                    "scoring_system": "epss",
                    "scoring_elements": "0.24782",
                    "published_at": "2026-04-09T12:55:00Z"
                },
                {
                    "value": "0.00085",
                    "scoring_system": "epss",
                    "scoring_elements": "0.24795",
                    "published_at": "2026-04-11T12:55:00Z"
                },
                {
                    "value": "0.00085",
                    "scoring_system": "epss",
                    "scoring_elements": "0.24754",
                    "published_at": "2026-04-12T12:55:00Z"
                },
                {
                    "value": "0.00138",
                    "scoring_system": "epss",
                    "scoring_elements": "0.33582",
                    "published_at": "2026-04-01T12:55:00Z"
                },
                {
                    "value": "0.00138",
                    "scoring_system": "epss",
                    "scoring_elements": "0.33913",
                    "published_at": "2026-04-02T12:55:00Z"
                },
                {
                    "value": "0.00138",
                    "scoring_system": "epss",
                    "scoring_elements": "0.33945",
                    "published_at": "2026-04-04T12:55:00Z"
                }
            ],
            "url": "https://api.first.org/data/v1/epss?cve=CVE-2021-43531"
        },
        {
            "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-5tg2-vh52-5yhc"
}