Nginx Modsecurity Waf

nginx_modsecurity_waf

Vendor: F5 • 1 CVE

CVEs (1)

CVE

VENDORS

PRODUCTS

UPDATED

PUBLISHED

CVSS

CVE-2021-42717

5Debian

F5Oracle+2 more

6Debian Linux

Http ServerModsecurity+3 more

Jul 3, 2025

Dec 7, 2021

N/A· v4

7.5 HIGH· v3

5.0 MEDIUM· v2

ModSecurity 3.x through 3.0.5 mishandles excessively nested JSON objects. Crafted JSON objects with nesting tens-of-thousands deep could result in the web server being unable to service legitimate requests. Even a moderately large (e.g., 300KB) HTTP request can occupy one of the limited NGINX worker processes for minutes and consume almost all of the available CPU on the machine. Modsecurity 2 is similarly vulnerable: the affected versions include 2.8.0 through 2.9.4.Show less