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CVE-2019-17026: Mozilla Firefox And Thunderbird Type Confusion Vulnerability
Mozilla Firefox and Thunderbird · in CISA KEV since 2021-11-03
2021-11-03added to KEV
2022-05-03federal remediation due date
46.31%EPSS exploit probability (30 days) 98.8th percentile
8.8 HIGHCVSS 3.1
Unknownknown ransomware use
611days from NVD publication to KEV
What it is
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 (CISA)
Apply updates per vendor instructions.
| CWE | CWE-843 |
|---|---|
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| NVD published | 2020-03-02 (Analyzed) |
Original records: NVD · CISA KEV · JSON: /api/cve/CVE-2019-17026.json · all KEV CVEs
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Get the full file: Exploited Vulnerabilities Brief – September 2026 ($29): this month's KEV additions ranked by EPSS, ransomware use and due date, ready to hand to a patch team. Checkout by Polar.