Netskope Threat Labs

BROWSER-FIREFOX IonMonkey MArraySlice buffer overflow attempt

IPS-CFWIPS-SWG

1 SID: 52430

First seen
October 2023
Last seen
October 2026

Detects JavaScript that exploits CVE-2019-9810, a buffer overflow in the MArraySlice operation of Firefox's IonMonkey optimizing compiler that can allow code execution. The rule matches the tight loop over a large index range that public exploits use to corrupt memory during array slicing.