CVE-2019-11707
Mozilla Firefox and Thunderbird Type Confusion Vulnerability
- Published
- Jul 23, 2019
- Updated
- Oct 21, 2025
- Assigning CNA
- mozilla
- Evidence observed
- Jun 26, 2019
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
- 98.5%
- 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
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.
Sources
6- cve-2019-11707Exploit
https://bugs.chromium.org/p/project-zero/issues/detail?id=1820
Windows proof-of-concept exploit chain for CVE-2019-11707, a Firefox IonMonkey type confusion, combining browser RCE with sandbox escape to achieve SYSTEM.
Proof of concept for CVE-2019-11707
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