CVE-2026-42915
Modified
Modified - Updated After Analysis
Incorrect Buffer Size Calculation in Windows TCP/IP Allows DoS
Vulnerability report for CVE-2026-42915, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-06-09
Last updated on: 2026-06-19
Assigner: Microsoft Corporation
Description
Description
Incorrect calculation of buffer size in Windows VMSwitch allows an authorized attacker to deny service locally.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| microsoft | windows_10_21h2 | to 10.0.19044.7417 (exc) |
| microsoft | windows_10_21h2 | to 10.0.19044.7417 (exc) |
| microsoft | windows_10_21h2 | to 10.0.19044.7417 (exc) |
| microsoft | windows_10_22h2 | to 10.0.19045.7417 (exc) |
| microsoft | windows_10_22h2 | to 10.0.19045.7417 (exc) |
| microsoft | windows_10_22h2 | to 10.0.19045.7417 (exc) |
| microsoft | windows_11_23h2 | to 10.0.22631.7219 (exc) |
| microsoft | windows_11_23h2 | to 10.0.22631.7219 (exc) |
| microsoft | windows_11_24h2 | to 10.0.26100.8655 (exc) |
| microsoft | windows_11_24h2 | to 10.0.26100.8655 (exc) |
| microsoft | windows_11_25h2 | to 10.0.26200.8655 (exc) |
| microsoft | windows_11_25h2 | to 10.0.26200.8655 (exc) |
| microsoft | windows_11_26h1 | to 10.0.28000.2269 (exc) |
| microsoft | windows_11_26h1 | to 10.0.28000.2269 (exc) |
| microsoft | windows_server_2022 | to 10.0.20348.5256 (exc) |
| microsoft | windows_server_2025 | to 10.0.26100.32995 (exc) |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-131 | The product does not correctly calculate the size to be used when allocating a buffer, which could lead to a buffer overflow. |
