KEV Entry

CVE-2020-6820

Known Exploited Vulnerability Entry External Catalog

Back to Catalog View Vulnerability
Entry Details
Confirmed Exploited

CVE-2020-6820

2021-11-03 00:00 UTC

Timestamps

2021-11-03

2021-11-03

Scope

KEVIntel entry: 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) | 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': 'kevintel', 'url': 'https://kevintel.com/vuln/CVE-2020-6820'}

bb3628c5-931d-4981-9b2b-c8c59641600b

caeb2787-0d58-4236-9039-7c86c3e566f3

2026-06-23 11:13 UTC

2026-06-23 11:13 UTC

Evidence
1
Type Source Signal Confidence Details GCVE Metadata
public_report kevintel successful_exploitation 0.70
View details 
{
  "added_date": "2021-11-03T00:00:00.000Z",
  "ahead_of_cisa_kev": null,
  "cvss_score": 8.1,
  "cvss_severity": "HIGH",
  "epss_percentile": null,
  "epss_score": null,
  "feed": "KEVIntel (kevintel.com)",
  "not_yet_in_cisa_kev": false,
  "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"
}
 -
Export Options
JSON Object JSON API View Full Catalog