CVE-2020-17131

Chakra Scripting Engine Memory Corruption Vulnerability

4.2 MediumFix available

Chakra Scripting Engine Memory Corruption Vulnerability

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: High
Privileges needed: None
User interaction: Required

What an attacker can affect

Confidentiality: Low
Integrity: Low
Availability: None

Exploit likelihood

2.04%Down 1.7 points since Apr 14, 2021

What each source reports

CVE List Score used 4.2

Chakra Scripting Engine Memory Corruption Vulnerability

Chakra Scripting Engine Memory Corruption Vulnerability

Record: CVE-2020-17131
CVSS 3.1: 4.2 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N/E:P/RL:O/RC:C
Updated: 2026-11-02

EUVDEUVD-2021-0865 4.2

Chakra Scripting Engine Memory Corruption Vulnerability

Record: EUVD-2021-0865
CVSS 3.1: 4.2 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N/E:P/RL:O/RC:C
Updated: 2026-11-02

GitHub AdvisoriesGHSA-qwwg-gc55-qqrv 7.5

Out-of-bounds Write in Chakra

Chakra Scripting Engine Memory Corruption Vulnerability

Record: GHSA-qwwg-gc55-qqrv
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness: CWE-787
Updated: 2026-11-02

NVD 4.2

Chakra Scripting Engine Memory Corruption Vulnerability

Record: CVE-2020-17131
CVSS 3.1: 4.2 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS 2.0: 5.1 MediumAV:N/AC:H/Au:N/C:P/I:P/A:P
Weakness: CWE-787
Updated: 2026-11-02

OSV 4.2

Chakra Scripting Engine Memory Corruption Vulnerability

Record: CVE-2020-17131
CVSS 3.1: 4.2 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
Updated: 2026-11-02

OSVGHSA-qwwg-gc55-qqrv 7.5

Out-of-bounds Write in Chakra

Chakra Scripting Engine Memory Corruption Vulnerability

Record: GHSA-qwwg-gc55-qqrv
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness: CWE-787
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`Microsoft.ChakraCore` NuGet	before 1.11.24	1.11.24
`Microsoft.ChakraCore` NuGet	before 1.11.24, plus listed versions 1.10.01.10.11.10.21.11.01.11.1 Show 45 moreShow less 1.11.101.11.111.11.121.11.131.11.141.11.151.11.161.11.171.11.181.11.191.11.21.11.201.11.211.11.221.11.231.11.31.11.41.11.51.11.61.11.71.11.81.11.91.2.01.2.11.2.21.2.31.2.6.62716-preview1.3.01.3.11.3.21.4.01.4.11.4.21.4.31.4.41.4.51.5.01.5.11.5.21.5.31.6.01.6.21.7.01.7.11.7.2	1.11.24

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2020-17131 is a medium vulnerability (CVSS 4.2) in Microsoft Chakracore, published December 9, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.04%, the 81st percentile. Fixed in Microsoft.ChakraCore 1.11.24.

References

This page doesn't list everything

Left out here: 10 versions. The JSON record has them.