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CVE-2019-9813

HighPublished

Incorrect handling of proto mutations may lead to type confusion in IonMonkey JIT code and can be leveraged for arbitrary memory read and write. This...

Published: Apr 26, 2019
Updated: Aug 4, 2024
Assigning CNA: mozilla
Evidence observed: Apr 3, 2019

Primary CVSS

8.8/ 10High

nvd · CVSS 3.0

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

EPSS probability estimate

6.3%

Low · next 30 days

Percentile: 93.3%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

Incorrect handling of __proto__ mutations may lead to type confusion in IonMonkey JIT code and can be leveraged for arbitrary memory read and write. This vulnerability affects Firefox < 66.0.1, Firefox ESR < 60.6.1, and Thunderbird < 60.6.1.

Sources

SpiderMonkey - IonMonkey Compiled Code Fails to Update Inferred Property Types (Type Confusion)Exploit
Google Security Research · multiple · Apr 3, 2019

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