CVE-2019-17026 (GCVE-0-2019-17026)

Vulnerability from cvelistv5 – Published: 2020-03-02 04:05 – Updated: 2025-10-21 23:35
VLAI? CISA KEV
Summary
Incorrect alias information in IonMonkey JIT compiler for setting array elements could lead to a type confusion. We are aware of targeted attacks in the wild abusing this flaw. This vulnerability affects Firefox ESR < 68.4.1, Thunderbird < 68.4.1, and Firefox < 72.0.1.
Severity ?
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE
  • IonMonkey type confusion with StoreElementHole and FallibleStoreElement
Assigner
References
Impacted products
Vendor Product Version
Mozilla Firefox ESR Affected: unspecified , < 68.4.1 (custom)
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Mozilla Thunderbird Affected: unspecified , < 68.4.1 (custom)
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Mozilla Firefox Affected: unspecified , < 72.0.1 (custom)
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CISA KEV
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 0ef2039c-2e7f-4f92-9fed-d54b894faa7c

Vulnerability ID: CVE-2019-17026

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 Type Confusion Vulnerability | Affected: Mozilla / Firefox and Thunderbird | Description: Mozilla Firefox and Thunderbird contain a type confusion vulnerability due to incorrect alias information in the IonMonkey JIT compiler when setting array elements. | 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-2019-17026
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-843
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 Type Confusion Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-02-02 12:28 UTC | Updated: 2026-02-06 07:17 UTC
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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.