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CVE-2021-42717

Published: 7 December 2021

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.

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
modsecurity
Launchpad, Ubuntu, Debian
focal Needs triage

hirsute Ignored
(end of life)
impish Ignored
(end of life)
jammy Needs triage

kinetic Ignored
(end of life, was needs-triage)
lunar Ignored
(end of life, was needs-triage)
mantic Needs triage

noble Needs triage

trusty Ignored
(end of standard support)
upstream Needs triage

xenial Ignored
(end of standard support)
modsecurity-apache
Launchpad, Ubuntu, Debian
bionic
Released (2.9.2-1ubuntu0.1~esm1)
Available with Ubuntu Pro
focal
Released (2.9.3-1ubuntu0.1)
hirsute Ignored
(end of life)
impish Ignored
(end of life)
jammy Not vulnerable
(2.9.5-1)
kinetic Ignored
(end of life, was needs-triage)
lunar Not vulnerable
(2.9.7-1)
mantic Not vulnerable
(2.9.7-1)
noble Not vulnerable
(2.9.7-1)
trusty Not vulnerable
(code not present)
upstream
Released (2.9.7-1)
xenial
Released (2.9.0-1ubuntu0.1~esm1)
Available with Ubuntu Pro

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H