CVE-2019-1429

HIGH KEV

Internet Explorer - Remote Code Execution via Scripting Engine Memory Corruption

Title source: llm
STIX 2.1

Exploitation Summary

CVE-2019-1429 is actively exploited and listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added November 3, 2021. EIP tracks 1 public exploit from researchers including Google Security Research.

AI-analyzed exploit summary This PoC exploits a use-after-free vulnerability in JScript (via Internet Explorer) by manipulating the 'arguments' object during a 'toJSON' callback, leading to a crash. The exploit demonstrates the vulnerability by forcing garbage collection while retaining a reference to a freed object.

Description

A remote code execution vulnerability exists in the way that the scripting engine handles objects in memory in Internet Explorer, aka 'Scripting Engine Memory Corruption Vulnerability'. This CVE ID is unique from CVE-2019-1426, CVE-2019-1427, CVE-2019-1428.

Exploits (1)

exploitdb WORKING POC VERIFIED
by Google Security Research · textdoswindows
https://www.exploit-db.com/exploits/47707

This PoC exploits a use-after-free vulnerability in JScript (via Internet Explorer) by manipulating the 'arguments' object during a 'toJSON' callback, leading to a crash. The exploit demonstrates the vulnerability by forcing garbage collection while retaining a reference to a freed object.

Classification
Working Poc 100%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Internet Explorer (JScript engine)
No auth needed
Prerequisites: Internet Explorer with JScript enabled · Target system running a vulnerable version of Windows
devstral-2 · analyzed Feb 16, 2026 Full analysis →

Scores

CVSS v3 7.5
EPSS 0.7263
EPSS Percentile 99.4%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation active
Automatable no
Technical Impact total

Details

CISA KEV 2021-11-03
VulnCheck KEV 2019-11-12
InTheWild.io 2019-11-12
ENISA EUVD EUVD-2019-9986
CWE
CWE-416 CWE-787
Status published
Products (3)
microsoft/internet_explorer 9
microsoft/internet_explorer 10
microsoft/internet_explorer 11
Published Nov 12, 2019
KEV Added Nov 03, 2021
Tracked Since Feb 18, 2026