CVE Watch—

CVE-2019-17026

Mozilla Firefox And Thunderbird Type Confusion Vulnerability

CVSS

—

No CVSS

EPSS

43.4%

p99

KEV

YES

Nov 3, 2021

Exploit Today

0-100

Published: — · Last modified: —

EPSS · 30d

43.4%EPSS · 30 days46.6%

2026-06-302026-07-16

KEV catalog record

Product

Mozilla / Firefox and Thunderbird

Vulnerability

Mozilla Firefox And Thunderbird Type Confusion Vulnerability

Added to KEV

Nov 3, 2021

Remediate by

May 3, 2022

Known ransomware use

Summary 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.

Notes

https://nvd.nist.gov/vuln/detail/CVE-2019-17026

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