CVE-2021-4226

9.8 criticalEPSS 0.5%

Critical (9.8) in rsjoomla rsfirewall\!. EPSS 0.5% chance of exploitation in the next 30 days.

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.

Severity

9.8 critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.5% chance of exploitation in the next 30 days; higher than 45% of CVEs (scores of 2026-10-31)
CWE: CWE-345
Published: 2022-12-15
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19