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CVE-2019-9791

9.8 · CRITICAL

The type inference system allows the compilation of functions that can cause type confusions between arbitrary objects when compiled through the IonMonkey just-in-time (JIT) compiler and when the c…

Published Apr 26, 2019CWE-843EPSS 19.91%

Overview

CVE-2019-9791 is a critical-severity vulnerability. It was published on April 26, 2019 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

The type inference system allows the compilation of functions that can cause type confusions between arbitrary objects when compiled through the IonMonkey just-in-time (JIT) compiler and when the constructor function is entered through on-stack replacement (OSR). This allows for possible arbitrary reading and writing of objects during an exploitable crash. This vulnerability affects Thunderbird < 60.6, Firefox ESR < 60.6, and Firefox < 66.

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

Refaccess.redhat.com/errata/RHSA-2019:0966Refaccess.redhat.com/errata/RHSA-2019:1144Refbugzilla.mozilla.org/show_bug.cgi?id=1530958Refwww.mozilla.org/security/advisories/mfsa2019-07/Refwww.mozilla.org/security/advisories/mfsa2019-08/Refwww.mozilla.org/security/advisories/mfsa2019-11/Refaccess.redhat.com/errata/RHSA-2019:0966Refaccess.redhat.com/errata/RHSA-2019:1144Refbugzilla.mozilla.org/show_bug.cgi?id=1530958Refwww.mozilla.org/security/advisories/mfsa2019-07/

How CyberStrike helps

Frequently asked questions

What is CVE-2019-9791?

CVE-2019-9791 is a critical-severity vulnerability. It was published on April 26, 2019 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2019-9791?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2019-9791?

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-2019-9791?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2019-9791 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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