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CVE-2019-17026

Known Exploited (CISA KEV)HIGH

8.8

CVSS Severity Score

EPSS Score66.0560%

EPSS Percentile86.69th

PublishedMar 2, 2020

Last ModifiedNov 4, 2025

Vulnerability 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.

Affected Platforms (CPE)

📦

Mozilla

Firefox

< 68.4.1

📦

Mozilla

Firefox

< 72.0.1

📦

Mozilla

Thunderbird

< 68.4.1

💻

Canonical

Ubuntu Linux

= 16.04

References & Advisories

🔗 http://packetstormsecurity.com/files/162568/Firefox-72-IonMonkey-JIT-Type-Confusion.html

🔗 https://bugzilla.mozilla.org/show_bug.cgi?id=1607443

🔗 https://security.gentoo.org/glsa/202003-02

🔗 https://usn.ubuntu.com/4335-1/

🔗 https://www.mozilla.org/security/advisories/mfsa2020-03/

🔗 https://www.mozilla.org/security/advisories/mfsa2020-04/

🔗 http://packetstormsecurity.com/files/162568/Firefox-72-IonMonkey-JIT-Type-Confusion.html

🔗 https://bugzilla.mozilla.org/show_bug.cgi?id=1607443

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