NinjaFirewall <= 4.3.3 - Authenticated PHAR Deserialization
Priority LOW 35CWE-502Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- High
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-502.
Summary
The NinjaFirewall plugin for WordPress is vulnerable to Authenticated PHAR Deserialization in versions up to, and including, 4.3.3. This allows authenticated attackers to perform phar deserialization on the server. This deserialization can allow other plugin or theme exploits if vulnerable software is present (WordPress, and NinjaFirewall).
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00636 50th percentileScored 2026-11-07
Fix Fixed NinjaFirewall (WP Edition) – Advanced Security Plugin and Firewall (nintechnet): 4.3.4
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- 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 |
|---|---|---|---|---|---|
| nintechnet | NinjaFirewall (WP Edition) – Advanced Security Plugin and Firewall | before 4.3.4 | 4.3.4 | Patch available | CNA |
- NinjaFirewall (WP Edition) – Advanced Security Plugin and Firewall Vendornintechnet Affected before 4.3.4 Fixed in 4.3.4 Patch available CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:nintechnet:ninjafirewall:*:*:*:*:*:wordpress:*:* | up to 4.3.3 | Vulnerable | nintechnet |
- cpe:2.3:a:nintechnet:ninjafirewall:*:*:*:*:*:wordpress:*:* Versions up to 4.3.3 Vulnerable ·nintechnet
Remediation
- Fix · CNA NinjaFirewall (WP Edition) – Advanced Security Plugin and Firewall (nintechnet) Fixed in 4.3.4
Timeline
- 2026-10-02 Threatist record created from CVE-2021-4451
- 2026-10-03 Alias added: GHSA-pgv2-9j82-2qcq
- 2026-10-25 EPSS moved to the 50th–90th percentile
References
Sources
- CVE-2021-4451 · CVE Program
- CVE-2021-4451 · NVD
- FIRST EPSS
- GHSA-pgv2-9j82-2qcq · 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