CVE-2026-42913 — Remote Desktop Client Remote Code Execution Vulnerability

Executive Summary

Heap-based buffer overflow in Remote Desktop Client allows an unauthorized attacker to execute code over a network.

Overview

7.5

CVSS HIGH

Important

MS Severity

Not Exploited

MS Exploit Status

Exploitation Unlikely

MS Exploit Likelihood

Category Remote Code Execution

Released Jun 9 2026

Last Updated Jun 9 2026

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

EPSS Score 0.00423 — 0.33678 percentile

NVD CVSS 7.5 HIGH — matches MSRC

CVSS Vector

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

ATTACK VECTOR

Network

ATTACK COMPLEXITY

High

PRIVILEGES REQUIRED

None

USER INTERACTION

Required

SCOPE

Unchanged

CONFIDENTIALITY

High

INTEGRITY

High

AVAILABILITY

High

EXPLOIT CODE MATURITY

Unproven

REMEDIATION LEVEL

Official Fix

REPORT CONFIDENCE

Confirmed

Temporal Score: 6.5

EPSS Score

0.00423

probability of exploitation in the next 30 days

0.33678 percentile - updated 2026-06-21

View on FIRST.org

Affected Products

13 affected products

Product	KB Article	Severity	Impact	Restart Required
Remote Desktop client for Windows Desktop	`Release Notes (Security Update)`	Important	Remote Code Execution	Maybe
Windows 11 Version 23H2 for ARM64-based Systems	`5093998 (Security Update)`	Important	Remote Code Execution	Yes
Windows 11 Version 23H2 for x64-based Systems	`5093998 (Security Update)`	Important	Remote Code Execution	Yes
Windows 11 Version 24H2 for ARM64-based Systems	`5094126 (Security Update)`	Important	Remote Code Execution	Yes
Windows 11 Version 24H2 for x64-based Systems	`5094126 (Security Update)`	Important	Remote Code Execution	Yes
Windows 11 Version 25H2 for ARM64-based Systems	`5094126 (Security Update)`	Important	Remote Code Execution	Yes
Windows 11 Version 25H2 for x64-based Systems	`5094126 (Security Update)`	Important	Remote Code Execution	Yes
Windows 11 Version 26H1 for ARM64-based Systems	`5095051 (Security Update)`	Important	Remote Code Execution	Yes
Windows 11 version 26H1 for x64-based Systems	`5095051 (Security Update)`	Important	Remote Code Execution	Yes
Windows Server 2022	`5094128 (Security Update)`	Important	Remote Code Execution	Yes
Windows Server 2022 (Server Core installation)	`5094128 (Security Update)`	Important	Remote Code Execution	Yes
Windows Server 2025	`5094125 (Security Update)`	Important	Remote Code Execution	Yes
Windows Server 2025 (Server Core installation)	`5094125 (Security Update)`	Important	Remote Code Execution	Yes

Patches

6 patches

Article	Type	Restart
`Release Notes`	Security Update	Maybe
`5093998`	Security Update	Yes
`5094126`	Security Update	Yes
`5095051`	Security Update	Yes
`5094128`	Security Update	Yes
`5094125`	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

pwn2addr

References

MSRC Advisory MITRE NVD