HackZoneLabs News
Newsletter

CVE-2019-11707

Mozilla Firefox and Thunderbird Type Confusion Vulnerability

  • High 8.8
  • Exploited: added to CISA KEV 23 May 2022

Description

A type confusion vulnerability can occur when manipulating JavaScript objects due to issues in Array.pop. This can allow for an exploitable crash. We are aware of targeted attacks in the wild abusing this flaw. This vulnerability affects Firefox ESR < 60.7.1, Firefox < 67.0.3, and Thunderbird < 60.7.2.

Key facts

Published
23 Jul 2019
Last changed
21 Oct 2025
Assigned by
mozilla
KEV added
23 May 2022
KEV fix due
13 Jun 2022
EPSS
37.951% likely to be exploited in the next 30 days, higher than 98.573% of CVEs (scores for 15 Nov 2026)
SSVC (CISA)
Exploitation: active; Automatable: no; Technical impact: total

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

  • 8.8CVSS 3.1, Highfrom CISA (ADP container)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

What to do

  • Apply updates per vendor instructions.CISA KEV required action

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

VendorProductVersions
MozillaFirefox ESR
  • unspecified up to but excluding 60.7.1 (affected)
MozillaFirefox
  • unspecified up to but excluding 67.0.3 (affected)
MozillaThunderbird
  • unspecified up to but excluding 60.7.2 (affected)

Timeline

  1. 23 Jul 2019 Published
  2. 23 May 2022 CVE-2019-11707 added to CISA KEV
  3. 23 May 2022 Added to the CISA KEV catalogue

Weakness

References