Remote Code Execution Vulnerability in Windows TCP/IP by Microsoft
CVE-2026-40415

8.1HIGH

Key Information:

Vendor

Microsoft
Status
Windows 10 Version 1809
Windows 10 Version 21h2
Windows 10 Version 22h2
Windows 11 Version 22h3
Vendor
CVE Published:
12 May 2026

What is CVE-2026-40415?

The vulnerability in Windows TCP/IP facilitates unauthorized code execution over a network by exploiting a use-after-free condition. This flaw can be targeted by attackers to compromise affected systems, leading to potential data breaches and unauthorized access. Users and organizations are encouraged to review patches and recommendations to mitigate risks associated with this vulnerability.

Affected Version(s)

Windows 10 Version 1809 32-bit Systems 10.0.17763.0 < 10.0.17763.8755

Windows 10 Version 21H2 32-bit Systems 10.0.19044.0 < 10.0.19044.7291

Windows 10 Version 22H2 32-bit Systems 10.0.19045.0 < 10.0.19045.7291

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisorypatch

CVSS V3.1

Score:
8.1
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.