Tracker / CVE-2021-42717
CVE-2021-42717
High 7.5
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.
Affected products and versions
| debian | debian_linux |
|---|---|
| f5 | nginx_modsecurity_waf |
| oracle | http_server |
| oracle | zfs_storage_appliance_kit |
| owasp | modsecurity · 3.0.0 → 3.0.6 |
| trustwave | modsecurity · 2.0.0 → 2.9.5 |
Analysis
This page is not indexable yet.Until it carries original analysis — what it actually exposes, how to check in two minutes whether a system was touched, what to do if it was — the page stays noindex. The database decides that, not the template.