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CVE-2019-17026

8.8 · HIGHActively Exploited

Incorrect alias information in IonMonkey JIT compiler for setting array elements could lead to a type confusion.

Published Mar 2, 2020CWE-843EPSS 46.31%

Overview

CVE-2019-17026 is a high-severity vulnerability. It was published on March 2, 2020 and has a CVSS 3.1 base score of 8.8 (HIGH). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refpacketstormsecurity.com/files/162568/Firefox-72-IonMonkey-JIT-Type-Confusion.htmlRefbugzilla.mozilla.org/show_bug.cgi?id=1607443Refsecurity.gentoo.org/glsa/202003-02Refusn.ubuntu.com/4335-1/Refwww.mozilla.org/security/advisories/mfsa2020-03/Refwww.mozilla.org/security/advisories/mfsa2020-04/Refpacketstormsecurity.com/files/162568/Firefox-72-IonMonkey-JIT-Type-Confusion.htmlRefbugzilla.mozilla.org/show_bug.cgi?id=1607443Refsecurity.gentoo.org/glsa/202003-02Refusn.ubuntu.com/4335-1/

How CyberStrike helps

Frequently asked questions

What is CVE-2019-17026?

CVE-2019-17026 is a high-severity vulnerability. It was published on March 2, 2020 and has a CVSS 3.1 base score of 8.8 (HIGH). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.

How severe is CVE-2019-17026?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2019-17026?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2019-17026?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2019-17026 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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