CVE-2019-17026
- State
- Published
- Severity
- 8.8 High
- Published
- Mar 2, 2020
- Updated
- Oct 21, 2025
- Reserved
- Sep 30, 2019
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 8.8 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H | CISA-ADP |
Weaknesses
- CWE-843 Access of Resource Using Incompatible Type ('Type Confusion')
Affected Products
| Product | Versions |
|---|---|
Firefox ESRMozilla |
|
ThunderbirdMozilla |
|
FirefoxMozilla |
|
References
- https://www.mozilla.org/security/advisories/mfsa2020-04/
- https://www.mozilla.org/security/advisories/mfsa2020-03/
- https://bugzilla.mozilla.org/show_bug.cgi?id=1607443
- GLSA-202003-02vendor-advisory
- USN-4335-1vendor-advisory
- http://packetstormsecurity.com/files/162568/Firefox-72-IonMonkey-JIT-Type-Confusion.html
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-17026government-resource
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