CVE-2019-9791
CRITICALThunderbird <60.6-Firefox <66 - Memory Corruption
Title source: llmDescription
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.
Exploits (2)
exploitdb
WORKING POC
VERIFIED
by Google Security Research · javascriptdosmultiple
https://www.exploit-db.com/exploits/46613
References (6)
Scores
CVSS v3
9.8
EPSS
0.3807
EPSS Percentile
97.2%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Details
CWE
CWE-843
Status
published
Products (10)
mozilla/firefox
< 60.6.0
mozilla/thunderbird
< 60.6.0
redhat/enterprise_linux
8.0
redhat/enterprise_linux_eus
8.1
redhat/enterprise_linux_eus
8.2
redhat/enterprise_linux_eus
8.4
redhat/enterprise_linux_server_aus
8.2
redhat/enterprise_linux_server_aus
8.4
redhat/enterprise_linux_server_tus
8.2
redhat/enterprise_linux_server_tus
8.4
Published
Apr 26, 2019
Tracked Since
Feb 18, 2026