CVE-2016-7203

HIGH EXPLOITED

Microsoft Edge - Remote Code Execution via Chakra JavaScript Engine Memory Corruption

Title source: llm

Exploitation Summary

CVE-2016-7203 has been observed exploited in the wild (reported by VulnCheck KEV). EIP tracks 1 public exploit from researchers including Google Security Research.

AI-analyzed exploit summary This exploit demonstrates a heap overflow in Chakra's Array.splice due to improper boundary checks after ArraySpeciesCreate execution. It manipulates array lengths and prototypes to trigger an out-of-bounds write, potentially leading to remote code execution.

Description

The Chakra JavaScript scripting engine in Microsoft Edge allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted web site, aka "Scripting Engine Memory Corruption Vulnerability," a different vulnerability than CVE-2016-7200, CVE-2016-7201, CVE-2016-7202, CVE-2016-7208, CVE-2016-7240, CVE-2016-7242, and CVE-2016-7243.

Exploits (1)

exploitdb WORKING POC VERIFIED

by Google Security Research · htmldoswindows

https://www.exploit-db.com/exploits/40787

View Code ZIP pw:eip

This exploit demonstrates a heap overflow in Chakra's Array.splice due to improper boundary checks after ArraySpeciesCreate execution. It manipulates array lengths and prototypes to trigger an out-of-bounds write, potentially leading to remote code execution.

Classification

Working Poc 90%

Attack Type

Rce

Complexity

Moderate

Reliability

Racy

Target: Microsoft Edge (Chakra JavaScript engine)

No auth needed

Prerequisites: Target must be using a vulnerable version of Microsoft Edge with Chakra engine

MITRE ATT&CK

T1190 - Exploit Public-Facing Application

devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (4)

Core 4

Core References

Vendor Advisory vendor-advisory x_refsource_ms

https://docs.microsoft.com/en-us/security-updates/securitybulletins/2016/ms16-129

Exploit, Third Party Advisory exploit x_refsource_exploit-db

https://www.exploit-db.com/exploits/40787/

Third Party Advisory, VDB Entry vdb-entry x_refsource_bid

http://www.securityfocus.com/bid/94039

Third Party Advisory, VDB Entry vdb-entry x_refsource_sectrack

http://www.securitytracker.com/id/1037245

Scores

CVSS v3 7.5

EPSS 0.6943

EPSS Percentile 98.7%

Attack Vector NETWORK

CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Details

VulnCheck KEV 2021-08-17

CWE

CWE-119

Status published

Products (2)

microsoft/edge

nuget/Microsoft.ChakraCore 0 - 1.2.2NuGet

Published Nov 10, 2016

Tracked Since Feb 18, 2026