What is CVE-2021-4451?

CVE-2021-4451 is a medium-severity vulnerability in Nintechnet Ninjafirewall, classified under Deserialization of Untrusted Data. CVSS score: 6.6/10. Published 2024-10-16.

How severe is CVE-2021-4451?

Medium severity. CVSS v3 base score is 6.6 out of 10.

Is CVE-2021-4451 known to be exploited?

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

Deserialization in Nintechnet Ninjafirewall

CVE-2021-4451

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).

Vulnerability class: Insecure Deserialization

EPSS: 0.006 (46.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.6 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H.

Affected products

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

Public proof-of-concept exploits

References

security@wordfence.com (Third Party Advisory)
security@wordfence.com (Patch)

Frequently asked questions

What is CVE-2021-4451?: CVE-2021-4451 is a medium-severity vulnerability in Nintechnet Ninjafirewall, classified under Deserialization of Untrusted Data. CVSS score: 6.6/10. Published 2024-10-16.
How severe is CVE-2021-4451?: Medium severity. CVSS v3 base score is 6.6 out of 10.
Is CVE-2021-4451 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.