KEV Entry

CVE-2020-6820

Known Exploited Vulnerability Entry Previdian

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Entry Details
Confirmed Exploited

CVE-2020-6820

2021-11-03 01:00 CET

Timestamps

2021-11-03

2021-11-03

Scope

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... | Affected: Mozilla / Thunderbird, Firefox, Firefox ESR | CVSS: 8.1 (HIGH) | EPSS: 0.07063 | Used in malware: unknown | Not yet in CISA KEV: False

References
  • {'id': 'CVE-2020-6820', 'url': 'https://www.cve.org/CVERecord?id=CVE-2020-6820'}
  • {'id': 'previdian', 'url': 'https://previdian.com/CVE-2020-6820'}

e2945af5-6bbf-4844-aea5-aba15ce28982

Previdian
caeb2787-0d58-4236-9039-7c86c3e566f3

2026-10-02 09:10 CEST

2026-10-02 09:10 CEST

Evidence
1
Type Source Signal Confidence Details GCVE Metadata
public_report previdian successful_exploitation 0.70
View details 
{
  "added_date": "2021-11-03T00:00:00.000Z",
  "ahead_of_cisa_kev": null,
  "cve_id": "CVE-2020-6820",
  "cvss_estimated": false,
  "cvss_score": 8.1,
  "cvss_severity": "HIGH",
  "epss_percentile": 0.94013,
  "epss_score": 0.07063,
  "feed": "Previdian (previdian.com)",
  "ghsa_id": null,
  "not_yet_in_cisa_kev": false,
  "previous_ids": [],
  "product": "Thunderbird, Firefox, Firefox ESR",
  "title": "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...",
  "used_in_malware": "unknown",
  "vendor": "Mozilla",
  "virtual_patch": false,
  "vulnerability_id": "CVE-2020-6820"
}
 -
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