CVE-2021-42717

ModSecurity 3.x through 3.0.5 mishandles excessively nested JSON objects

published December 7, 2021

CVSS
—
EPSS
3%
Percentile
88.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS
Not scored
CVSS v4.0
Not supplied
EPSS
0.03249 · 88.2th percentile
Published
2021-12-07T21:08Z
EPSS history
Timeline
  • 07 DEC 21:08Z
    ModSecurity 3.x through 3.0.5 mishandles excessively nested JSON objects
    cvelistv5