CVE-2020-12421 (GCVE-0-2020-12421)

Vulnerability from cvelistv5 – Published: 2020-07-09 14:39 – Updated: 2024-08-04 11:56
VLAI
Summary
When performing add-on updates, certificate chains terminating in non-built-in-roots were rejected (even if they were legitimately added by an administrator.) This could have caused add-ons to become out-of-date silently without notification to the user. This vulnerability affects Firefox ESR < 68.10, Firefox < 78, and Thunderbird < 68.10.0.
Severity
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
CWE
  • Add-On updates did not respect the same certificate trust rules as software updates
Assigner
mozilla CNA under the mitre root
CNA scorecard E 38/100 over 546 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Mozilla Firefox ESR Affected: unspecified , < 68.10 (custom)
guessed Create a notification for this product.
Mozilla Firefox Affected: unspecified , < 78 (custom)
guessed Create a notification for this product.
Mozilla Thunderbird Affected: unspecified , < 68.10.0 (custom)
guessed Create a notification for this product.
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      "aggregate_severity": "Moderate",
      "current_release_date": "2025-11-21T16:55:42+00:00",
      "cve": "CVE-2020-12421",
      "id": "CVE-2020-12421",
      "initial_release_date": "2020-06-30T00:00:00+00:00",
      "product_status:fixed": "228",
      "product_status:known_affected": "2",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "Mozilla: Add-On updates did not respect the same certificate trust rules as software updates",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2020/cve-2020-12421.json",
      "version": "3"
    }
  }
}



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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

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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.
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  • 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.
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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.