{
    "data_type": "CVE",
    "data_format": "MITRE",
    "data_version": "4.0",
    "CVE_data_meta": {
        "ID": "CVE-2021-23960",
        "ASSIGNER": "security@mozilla.org",
        "STATE": "PUBLIC"
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "vendor_name": "Mozilla",
                    "product": {
                        "product_data": [
                            {
                                "product_name": "Firefox",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_value": "< 85"
                                        }
                                    ]
                                }
                            },
                            {
                                "product_name": "Thunderbird",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_value": "< 78.7"
                                        }
                                    ]
                                }
                            },
                            {
                                "product_name": "Firefox ESR",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_value": "< 78.7"
                                        }
                                    ]
                                }
                            }
                        ]
                    }
                }
            ]
        }
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "Use-after-poison for incorrectly redeclared JavaScript variables during GC"
                    }
                ]
            }
        ]
    },
    "references": {
        "reference_data": [
            {
                "url": "https://www.mozilla.org/security/advisories/mfsa2021-03/",
                "refsource": "MISC",
                "name": "https://www.mozilla.org/security/advisories/mfsa2021-03/"
            },
            {
                "url": "https://www.mozilla.org/security/advisories/mfsa2021-04/",
                "refsource": "MISC",
                "name": "https://www.mozilla.org/security/advisories/mfsa2021-04/"
            },
            {
                "url": "https://www.mozilla.org/security/advisories/mfsa2021-05/",
                "refsource": "MISC",
                "name": "https://www.mozilla.org/security/advisories/mfsa2021-05/"
            },
            {
                "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1675755",
                "refsource": "MISC",
                "name": "https://bugzilla.mozilla.org/show_bug.cgi?id=1675755"
            }
        ]
    },
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "Performing garbage collection on re-declared JavaScript variables resulted in a user-after-poison, and a potentially exploitable crash. This vulnerability affects Firefox < 85, Thunderbird < 78.7, and Firefox ESR < 78.7."
            }
        ]
    }
}