CVE-2020-6819 (GCVE-0-2020-6819)

Vulnerability from cvelistv5 – Published: 2020-04-24 15:56 – Updated: 2025-10-21 23:35
VLAI? CISA KEV
Summary
Under certain conditions, when running the nsDocShell destructor, 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.
Severity ?
8.1 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
  • Use-after-free while running the nsDocShell destructor
Assigner
References
Impacted products
Vendor Product Version
Mozilla Thunderbird Affected: unspecified , < 68.7.0 (custom)
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Mozilla Firefox Affected: unspecified , < 74.0.1 (custom)
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Mozilla Firefox ESR Affected: unspecified , < 68.6.1 (custom)
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CISA KEV
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: a970b190-9fbb-422e-a763-97feb3757ee3

Vulnerability ID: CVE-2020-6819

Status: Confirmed

Status Updated: 2021-11-03 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2021-11-03
Asserted: 2021-11-03
Scope
Notes: KEV entry: Mozilla Firefox And Thunderbird Use-After-Free Vulnerability | Affected: Mozilla / Firefox and Thunderbird | Description: Mozilla Firefox and Thunderbird contain a race condition vulnerability when running the nsDocShell destructor under certain conditions. The race condition creates a use-after-free vulnerability, causing unspecified impacts. | Required action: Apply updates per vendor instructions. | Due date: 2022-05-03 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://nvd.nist.gov/vuln/detail/CVE-2020-6819
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-362 CWE-416
Feed CISA Known Exploited Vulnerabilities Catalog
Product Firefox and Thunderbird
Due Date 2022-05-03
Date Added 2021-11-03
Vendorproject Mozilla
Vulnerabilityname Mozilla Firefox And Thunderbird Use-After-Free Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-02-02 12:28 UTC | Updated: 2026-02-06 07:17 UTC
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}


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Tags
Taxonomy of the tags.




Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.