What is CVE-2021-4226?

CVE-2021-4226 is a critical-severity vulnerability in Rsjoomla Rsfirewall\!, classified under Insufficient Verification of Data Authenticity. CVSS score: 9.8/10. Published 2022-12-15.

How severe is CVE-2021-4226?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2021-4226 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Rsjoomla Rsfirewall\!

CVE-2021-4226

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.

EPSS: 0.005 (40.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Rsjoomla Rsfirewall\!
Unknown Rsfirewall! — versions 0

Weakness classification (CWE)

CWE-345 — Insufficient Verification of Data Authenticity

Public proof-of-concept exploits

20142995/nuclei-templates

References

contact@wpscan.com (Exploit, technical-description, Third Party Advisory, exploit, vdb-entry)

Frequently asked questions

What is CVE-2021-4226?: CVE-2021-4226 is a critical-severity vulnerability in Rsjoomla Rsfirewall\!, classified under Insufficient Verification of Data Authenticity. CVSS score: 9.8/10. Published 2022-12-15.
How severe is CVE-2021-4226?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2021-4226 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.