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CVE-2019-11707

8.8
HIGHCVSS v3.1 Base Score
84.29%
HIGH RiskEPSS (99th percentile)
KEV

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.

Published: 7/23/2019
Modified: 10/27/2025
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ACTIVELY EXPLOITED IN THE WILD

This vulnerability is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

Vulnerability Name:

Mozilla Firefox and Thunderbird Type Confusion Vulnerability

Vendor / Product:

Mozilla Firefox and Thunderbird

Required Action:

Apply updates per vendor instructions.

Due Date: 6/13/2022(OVERDUE)
Added to KEV:

5/23/2022

Notes:

https://nvd.nist.gov/vuln/detail/CVE-2019-11707

Vulnerability Summary

CVSS v3 Score

8.8HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS v2 Score

7.5

AV:N/AC:L/Au:N/C:P/I:P/A:P

EPSS Score (Exploitation Probability)

84.29%HIGH Exploitation Risk
99th percentile

This vulnerability has a 84.29% probability of being exploited in the next 30 days, ranking higher than 99% of all scored CVEs.

CWE Classification

Related Vulnerabilities

Same Weakness Type(CWE-843)

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Similar SeverityHIGH