CVE-2020-1238 — Media Foundation Memory Corruption Vulnerability

Executive Summary

A memory corruption vulnerability exists when Windows Media Foundation improperly handles objects in memory. An attacker who successfully exploited the vulnerability could install programs; view, change, or delete data; or create new accounts with full user rights. There are multiple ways an attacker could exploit the vulnerability, such as by convincing a user to open a specially crafted document, or by convincing a user to visit a malicious webpage. The security update addresses the vulnerability by correcting how Windows Media Foundation handles objects in memory.

Overview

8.8

CVSS HIGH

Important

MS Severity

Not Exploited

MS Exploit Status

Less Likely

MS Exploit Likelihood

Category Remote Code Execution

Released Jun 9 2020

Last Updated Jun 9 2020

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

EPSS Score 0.06988 — 0.93323 percentile

NVD CVSS 8.8 HIGH — matches MSRC

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C

ATTACK VECTOR

Network

ATTACK COMPLEXITY

Low

PRIVILEGES REQUIRED

None

USER INTERACTION

Required

SCOPE

Unchanged

CONFIDENTIALITY

High

INTEGRITY

High

AVAILABILITY

High

EXPLOIT CODE MATURITY

Proof-of-Concept

REMEDIATION LEVEL

Official Fix

REPORT CONFIDENCE

Confirmed

Temporal Score: 7.9

EPSS Score

0.06988

probability of exploitation in the next 30 days

0.93323 percentile - updated 2026-06-21

View on FIRST.org

Affected Products

23 affected products

Product	KB Article	Severity	Impact	Restart Required
Windows 10 Version 1709 for 32-bit Systems	`4561602 (Security Update)`	Important	Remote Code Execution	Yes
Windows 10 Version 1709 for ARM64-based Systems	`4561602 (Security Update)`	Important	Remote Code Execution	Yes
Windows 10 Version 1709 for x64-based Systems	`4561602 (Security Update)`	Important	Remote Code Execution	Yes
Windows 10 Version 1803 for 32-bit Systems	`4561621 (Security Update)`	Important	Remote Code Execution	Yes
Windows 10 Version 1803 for ARM64-based Systems	`4561621 (Security Update)`	Important	Remote Code Execution	Yes
Windows 10 Version 1803 for x64-based Systems	`4561621 (Security Update)`	Important	Remote Code Execution	Yes
Windows 10 Version 1809 for 32-bit Systems	`4561608 (Security Update)`	Important	Remote Code Execution	Yes
Windows 10 Version 1809 for ARM64-based Systems	`4561608 (Security Update)`	Important	Remote Code Execution	Yes
Windows 10 Version 1809 for x64-based Systems	`4561608 (Security Update)`	Important	Remote Code Execution	Yes
Windows 10 Version 1903 for 32-bit Systems	`4560960 (Security Update)`	Important	Remote Code Execution	Yes
Windows 10 Version 1903 for ARM64-based Systems	`4560960 (Security Update)`	Important	Remote Code Execution	Yes
Windows 10 Version 1903 for x64-based Systems	`4560960 (Security Update)`	Important	Remote Code Execution	Yes
Windows 10 Version 1909 for 32-bit Systems	`4560960 (Security Update)`	Important	Remote Code Execution	Yes
Windows 10 Version 1909 for ARM64-based Systems	`4560960 (Security Update)`	Important	Remote Code Execution	Yes
Windows 10 Version 1909 for x64-based Systems	`4560960 (Security Update)`	Important	Remote Code Execution	Yes
Windows 10 Version 2004 for 32-bit Systems	`4557957 (Security Update)`	Important	Remote Code Execution	Yes
Windows 10 Version 2004 for ARM64-based Systems	`4557957 (Security Update)`	Important	Remote Code Execution	Yes
Windows Server 2019	`4561608 (Security Update)`	Important	Remote Code Execution	Yes
Windows Server 2019 (Server Core installation)	`4561608 (Security Update)`	Important	Remote Code Execution	Yes
Windows Server, version 1803 (Server Core Installation)	`4561621 (Security Update)`	Important	Remote Code Execution	Yes
Windows Server, version 1903 (Server Core installation)	`4560960 (Security Update)`	Important	Remote Code Execution	Yes
Windows Server, version 1909 (Server Core installation)	`4560960 (Security Update)`	Important	Remote Code Execution	Yes
Windows Server, version 2004 (Server Core installation)	`4557957 (Security Update)`	Important	Remote Code Execution	Yes

Patches

5 patches

Article	Type	Restart
`4561602`	Security Update	Yes
`4561621`	Security Update	Yes
`4561608`	Security Update	Yes
`4560960`	Security Update	Yes
`4557957`	Security Update	Yes

Known Exploits

No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.

Acknowledgments

@expend20, @dnpushme, Trend Micro's Zero Day Initiative

References

MSRC Advisory MITRE NVD