RSFirewall < 1.1.25 - IP Block Bypass
Priority HIGH 82CWE-345Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-345.
Summary
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.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00546 45th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA and NVD
Fix Fixed RSFirewall! (Unknown): 1.1.25
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Unknown | RSFirewall! | before 1.1.25 | 1.1.25 | Patch available | CNA |
- RSFirewall! VendorUnknown Affected before 1.1.25 Fixed in 1.1.25 Patch available CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:rsjoomla:rsfirewall\!:*:*:*:*:*:wordpress:*:* | before 1.1.25 | Vulnerable | rsjoomla.com |
- cpe:2.3:a:rsjoomla:rsfirewall\!:*:*:*:*:*:wordpress:*:* Versions before 1.1.25 Vulnerable ·rsjoomla.com
Remediation
- Fix · CNA RSFirewall! (Unknown) Fixed in 1.1.25
Timeline
- 2026-10-02 Threatist record created from CVE-2021-4226
- 2026-10-03 Alias added: GHSA-j8wj-77mv-262g
References
Sources
- CVE-2021-4226 · CVE Program
- CVE-2021-4226 · NVD
- FIRST EPSS
- GHSA-j8wj-77mv-262g · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences