Security Advisory

CVE-2021-42717

CVE vulnerability detail — eXtreme Datacenter Security Operations

Published 2021-12-07 21:08:28

Last updated 2024-08-04 03:38:49

Assigner mitre

State PUBLISHED

Description

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.

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