CVE-2019-17026
Mozilla Firefox And Thunderbird Type Confusion Vulnerability
- Published
- Mar 2, 2020
- Updated
- Oct 21, 2025
- Assigning CNA
- mozilla
- Evidence observed
- May 13, 2021
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HModerate · next 30 days
- Percentile
- 98.8%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
CISA Known Exploited
This CVE appears in the CISA Known Exploited Vulnerabilities catalog.
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.
Sources
5- DoubleStarExploit
A personalized/enhanced re-creation of the Darkhotel "Double Star" APT exploit chain with a focus on Windows 8.1 and mixed with some of my own techniques
- CVE-2019-17026-ExploitExploit
An exploit for CVE-2019-17026. It pops xcalc and was tested on Ubuntu (x64).
- ExploitsExploit
A personal collection of Windows CVE I have turned in to exploit source, as well as a collection of payloads I've written to be used in conjunction with these exploits.
Responsible use
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