CVE-2019-17026

high

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.

From the Tenable Blog

CVE-2019-17026: Zero-Day Vulnerability in Mozilla Firefox Exploited in Targeted Attacks

CVE-2019-17026: Zero-Day Vulnerability in Mozilla Firefox Exploited in Targeted Attacks

Published: 2020-01-08

Mozilla releases patch to address Firefox flaw being used as part of targeted attacks. Background On January 8, Mozilla Foundation released a security advisory to address a critical zero-day flaw in Mozilla Firefox, which has been exploited in targeted attacks.

References

https://usn.ubuntu.com/4335-1/

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

https://www.tenable.com/blog/how-covid-19-response-is-expanding-the-cyberattack-surface

https://www.tenable.com/blog/cve-2019-17026-zero-day-vulnerability-in-mozilla-firefox-exploited-in-targeted-attacks

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

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

Details

Source: Mitre, NVD

Published: 2020-03-02

Updated: 2025-03-21

Known Exploited Vulnerability (KEV)

Risk Information

CVSS v2

Base Score: 6.8

Vector: CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P

Severity: Medium

CVSS v3

Base Score: 8.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Severity: High

EPSS

EPSS: 0.45777