CVE-2021-31166 (GCVE-0-2021-31166)

Vulnerability from cvelistv5 – Published: 2021-05-11 19:11 – Updated: 2025-10-21 23:25
Title
HTTP Protocol Stack Remote Code Execution Vulnerability
Summary
HTTP Protocol Stack Remote Code Execution Vulnerability
SSVC
Exploitation: active Automatable: yes Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • Remote Code Execution
  • CWE-416 - Use After Free
Assigner
Impacted products
Vendor Product Version
Microsoft Windows 10 Version 2004 Affected: 10.0.0 , < 10.0.19041.982 (custom)
    cpe:2.3:o:microsoft:windows_10_1809:10.0.19041.982:*:*:*:*:*:x64:*
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Microsoft Windows Server version 2004 Affected: 10.0.0 , < 10.0.19041.982 (custom)
    cpe:2.3:o:microsoft:windows_server_2004:10.0.19041.982:*:*:*:*:*:*:*
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Microsoft Windows 10 Version 20H2 Affected: 10.0.0 , < 10.0.19042.982 (custom)
    cpe:2.3:o:microsoft:windows_10_20H2:10.0.19042.982:*:*:*:*:*:x86:*
    cpe:2.3:o:microsoft:windows_10_20H2:10.0.19042.982:*:*:*:*:*:arm64:*
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Microsoft Windows Server version 20H2 Affected: 10.0.0 , < 10.0.19042.982 (custom)
    cpe:2.3:o:microsoft:windows_server_20H2:10.0.19042.982:*:*:*:*:*:*:*
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Date Public
2021-05-11 07:00
CISA KEV
Known Exploited Vulnerability - GCVE BCP-07 Compliant

Vulnerability ID: CVE-2021-31166

Status: Confirmed

Status Updated: 2022-04-06 00:00 UTC

Exploited: Yes


Timestamps
First Seen: 2022-04-06
Asserted: 2022-04-06

Scope
Notes: KEV entry: Microsoft HTTP Protocol Stack Remote Code Execution Vulnerability | Affected: Microsoft / HTTP Protocol Stack | Description: Microsoft HTTP Protocol Stack contains a vulnerability in http.sys that allows for remote code execution. | Required action: Apply updates per vendor instructions. | Due date: 2022-04-27 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://nvd.nist.gov/vuln/detail/CVE-2021-31166

Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev


Details
Cwes CWE-416
Feed CISA Known Exploited Vulnerabilities Catalog
Product HTTP Protocol Stack
Due Date 2022-04-27
Date Added 2022-04-06
Vendorproject Microsoft
Vulnerabilityname Microsoft HTTP Protocol Stack Remote Code Execution Vulnerability
Knownransomwarecampaignuse Unknown

References

Created: 2026-02-02 12:27 UTC | Updated: 2026-02-06 07:17 UTC
KEVintel KEV
Known Exploited Vulnerability - GCVE BCP-07 Compliant

Vulnerability ID: CVE-2021-31166

Status: Confirmed

Status Updated: 2022-04-06 00:00 UTC

Exploited: Yes


Timestamps
First Seen: 2022-04-06
Asserted: 2022-04-06

Scope
Notes: KEVIntel entry: HTTP Protocol Stack Remote Code Execution Vulnerability | Affected: Microsoft / Windows 10 Version 2004, Windows Server version 2004, Windows 10 Version 20H2, Windows Server version 20H2 | CVSS: 9.8 (CRITICAL) | Used in malware: unknown | Not yet in CISA KEV: False

Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel


Details
Feed KEVIntel (kevintel.com)
Title HTTP Protocol Stack Remote Code Execution Vulnerability
Vendor Microsoft
Product Windows 10 Version 2004, Windows Server version 2004, Windows 10 Version 20H2, Windows Server version 20H2
Added Date 2022-04-06T00:00:00.000Z
Cvss Score 9.8
Epss Score None
Cvss Severity CRITICAL
Epss Percentile None
Used In Malware unknown
Ahead Of Cisa Kev None
Not Yet In Cisa Kev False

References

Created: 2026-06-19 12:47 UTC | Updated: 2026-06-19 12:47 UTC
Show details on NVD website

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      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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Detection rules are retrieved from Rulezet.

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