Under certain conditions, when handling a ReadableStream, a race condition can cause a use-after-free. We are aware of targeted attacks in the wild abusing this flaw. This vulnerability affects Thunderbird < 68.7.0, Firefox < 74.0.1, and Firefox ESR < 68.6.1.
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2020-6820.json"
[
{
"events": [
{
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},
{
"fixed": "68.6.1"
}
]
},
{
"events": [
{
"introduced": "0"
},
{
"fixed": "74.0.1"
}
]
},
{
"events": [
{
"introduced": "0"
},
{
"fixed": "68.7.0"
}
]
}
]