CVE-2019-9813

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.

Affected

Mozilla · Firefox · Firefox ESR · Thunderbird

CVSS v3.0 NVD

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

CVSS v2.0 NVD

6.8 MEDIUMAV:N/AC:M/Au:N/C:P/I:P/A:P

EPSS

7.39% chance of exploitation in the next 30 days, 94th percentile

Published

2019-04-26

Updated

2024-08-04

ExploitDB entries (1)

• https://www.exploit-db.com/exploits/46646

Security advisories

• https://bugzilla.mozilla.org/show_bug.cgi?id=1538006
• https://www.mozilla.org/security/advisories/mfsa2019-09
• https://www.mozilla.org/security/advisories/mfsa2019-10
• https://www.mozilla.org/security/advisories/mfsa2019-12

References

• CVE Record
• NVD entry