AUGUST 4, 2026
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Case File

CVE-2021-4226

CRITICAL · CVSS 9.8 EPSS 0.51%

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2022-12-15 · Last synced 2026-08-04

CyberRota Analysis

This is a critical severity vulnerability with a CVSS score of 9.8. See the original NVD description below for full technical details.

CVE
CVE-2021-4226
Severity
CRITICAL
CVSS
9.8
EPSS
0.51%

Original NVD Description

RSFirewall tries to identify the original IP address by looking at different HTTP headers. A bypass is possible due to the way it is implemented.

Related CVEs

Other vulnerabilities affecting the same vendor(s)

CVE-2026-57827 CRITICAL CVE-2025-30084 MEDIUM CVE-2025-27754 MEDIUM CVE-2025-27444 MEDIUM