{"id":"CVE-2021-4226","aliases":["EUVD-2021-34084","GHSA-j8wj-77mv-262g"],"status":"published","title":"RSFirewall \u003c 1.1.25 - IP Block Bypass","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.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.00546,"percentile":0.46097,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-345","CWE-639"],"published":"2022-12-15T17:14:40Z","modified":"2026-06-17T04:19:16Z","products":[{"vendor":"rsjoomla","product":"rsfirewall\\!"},{"vendor":"rsjoomla!","product":"rsfirewall!"},{"vendor":"unknown","product":"rsfirewall!"}],"references":[{"url":"https://wpscan.com/vulnerability/c0ed80c8-ebbf-4ed9-b02f-31660097c352","tags":["exploit","vdb-entry","technical-description","x_transferred","Exploit","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-4226"},{"url":"https://github.com/advisories/GHSA-j8wj-77mv-262g"}],"sources":{"cve":[{"id":"CVE-2021-4226","title":"RSFirewall \u003c 1.1.25 - IP Block Bypass","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.","status":"published","published":"2022-12-15T17:14:40.696Z","modified":"2025-04-21T14:18:04.471Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"adp"}],"cwes":["CWE-345"],"updated_at":"2026-11-02T14:33:07.697752Z"}],"euvd":[{"id":"EUVD-2021-34084","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.","status":"published","published":"2022-12-15T17:14:40Z","modified":"2025-04-21T14:18:04Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T20:52:18.663123Z"}],"ghsa":[{"id":"GHSA-j8wj-77mv-262g","title":"RSFirewall tries to identify the original IP address by looking at different HTTP headers. A...","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.","status":"published","published":"2022-12-15T21:30:29Z","modified":"2025-04-21T15:32:17Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-345","CWE-639"],"updated_at":"2026-11-02T15:01:58.520974Z"}],"nvd":[{"id":"CVE-2021-4226","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.","status":"published","published":"2022-12-15T19:15:16.41Z","modified":"2026-06-17T04:19:16.397Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"secondary"}],"cwes":["CWE-345"],"updated_at":"2026-11-02T14:07:07.323379Z"}]}}