Windows TCP/IP Denial of Service Vulnerability
CVE-2026-42915

5.7MEDIUM

Key Information:

Vendor

Microsoft
Status
Windows 10 Version 21h2
Windows 10 Version 22h2
Windows 11 Version 23h2
Windows 11 Version 23h2
Vendor
CVE Published:
9 June 2026

What is CVE-2026-42915?

Incorrect calculation of buffer size in Windows TCP/IP allows an authorized attacker to deny service over an adjacent network.

Affected Version(s)

Windows 10 Version 21H2 32-bit Systems 10.0.19044.0 < 10.0.19044.7417

Windows 10 Version 22H2 32-bit Systems 10.0.19045.0 < 10.0.19045.7417

Windows 11 version 23H2 ARM64-based Systems 10.0.22631.0 < 10.0.22631.7219

References

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

CVSS V3.1

Score:
5.7
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Adjacent Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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