9.8
CVE-2021-31166
- EPSS 92.96%
- Published 11.05.2021 19:15:09
- Last modified 13.03.2025 16:41:41
- Source secure@microsoft.com
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HTTP Protocol Stack Remote Code Execution Vulnerability
Data is provided by the National Vulnerability Database (NVD)
Microsoft ≫ Windows 10 2004 Version < 10.0.19041.982
Microsoft ≫ Windows 10 20h2 Version < 10.0.19042.982
Microsoft ≫ Windows Server 2004 Version < 10.0.19041.982
Microsoft ≫ Windows Server 20h2 Version < 10.0.19042.982
06.04.2022: CISA Known Exploited Vulnerabilities (KEV) Catalog
Microsoft HTTP Protocol Stack Remote Code Execution Vulnerability
VulnerabilityMicrosoft HTTP Protocol Stack contains a vulnerability in http.sys that allows for remote code execution.
DescriptionApply updates per vendor instructions.
Required actions| Type | Source | Score | Percentile |
|---|---|---|---|
| EPSS | FIRST.org | 92.96% | 0.998 |
| Source | Base Score | Exploit Score | Impact Score | Vector string |
|---|---|---|---|---|
| nvd@nist.gov | 7.5 | 10 | 6.4 |
AV:N/AC:L/Au:N/C:P/I:P/A:P
|
| nvd@nist.gov | 9.8 | 3.9 | 5.9 |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
|
| secure@microsoft.com | 9.8 | 3.9 | 5.9 |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
|
CWE-416 Use After Free
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.