Description
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.
Exploits (1)
exploitdb
WRITEUP
VERIFIED
by Google Security Research · textdosmultiple
https://www.exploit-db.com/exploits/46646
References (6)
Core 6
Core References
Vendor Advisory x_refsource_misc
https://www.mozilla.org/security/advisories/mfsa2019-09/
Vendor Advisory x_refsource_misc
https://www.mozilla.org/security/advisories/mfsa2019-10/
Vendor Advisory x_refsource_misc
https://www.mozilla.org/security/advisories/mfsa2019-12/
Issue Tracking, Permissions Required, Vendor Advisory x_refsource_misc
https://bugzilla.mozilla.org/show_bug.cgi?id=1538006
Vendor Advisory vendor-advisory
x_refsource_redhat
https://access.redhat.com/errata/RHSA-2019:0966
Vendor Advisory vendor-advisory
x_refsource_redhat
https://access.redhat.com/errata/RHSA-2019:1144
Scores
CVSS v3
8.8
EPSS
0.4667
EPSS Percentile
97.7%
Attack Vector
NETWORK
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Details
CWE
CWE-843
Status
published
Products (2)
mozilla/firefox
< 60.6.1
mozilla/thunderbird
< 60.6.1
Published
Apr 26, 2019
Tracked Since
Feb 18, 2026