CVE-2021-31166 — VulnIntel

CVE-2021-31166

CRITICAL

KEV

HTTP Protocol Stack Remote Code Execution Vulnerability

StatusAnalyzed

설명

HTTP Protocol Stack Remote Code Execution Vulnerability

Score Summary

CVSS Score: 9.8
Version: 3.1
VPI: 100
Why this VPI (explainable, experimental)
VPI breakdown
Impact 98.00
Exploitation signal(KEV listed) ×1.50
VPI 100.00
VPI formula vpi-v1
EPSS: 99.7%
(상위 99.9%)
Attack Vector: Network
Low Complexity
No Privileges
No User Interaction
Scope Unchanged
High Confidentiality Impact
High Integrity Impact
High Availability Impact

Details

CISA KEV Listing

Required Action

Apply updates per vendor instructions.

Vulnerability Lifecycle

Score Comparison by Source

Source	CVSS Version	Base Score	Severity	Vector String	Assessment Date
NVDNIST	3.1	9.8	CRITICAL	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	04/20/2026
NVDNIST	2.0	7.5

CWE Weakness Classification

References (3)

Affected Products (4)

Impact	98.00
Exploitation signal(KEV listed)	×1.50
VPI	100.00