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CVE-2021-42717

nvd nist
Published: Dec 7, 2021Modified: Jul 3, 2025

JSON object

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7.5
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Exploitability: 3.9 / Impact: 3.6
Source: NVD

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.

Affected (10)

Show all products
Owasp: Modsecurity · Trustwave: Modsecurity · F5: Nginx Modsecurity Waf · Debian: Debian Linux · Oracle: Http Server, Zfs Storage Appliance Kit
Owasp
1 product
Modsecurity
Trustwave
1 product
Modsecurity
F5
1 product
Nginx Modsecurity Waf
Debian
1 product
Debian Linux
Oracle
2 products
Http Server
Zfs Storage Appliance Kit
Configuration A
2 vulnerable
Vulnerable SoftwareAffected Versions
Modsecurity
From 3.0.0 to 3.0.6
Modsecurity
From 2.0.0 to 2.9.5
Configuration B
2 vulnerable
Vulnerable SoftwareAffected Versions
F5
Nginx Modsecurity Waf
Version r24
Nginx Modsecurity Waf
Version r25
Configuration C
3 vulnerable
Vulnerable SoftwareAffected Versions
Debian
Debian Linux
Version 10.0
Debian Linux
Version 11.0
Debian Linux
Version 9.0
Configuration D
3 vulnerable
Vulnerable SoftwareAffected Versions
Oracle
Http Server
Version 12.2.1.3.0
Http Server
Version 12.2.1.4.0
Zfs Storage Appliance Kit
Version 8.8

Related CWEs

CWE-674
Uncontrolled Recursion
The product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack.

References (8)

Source: cve@mitre.org
Mailing ListThird Party Advisory
Source: cve@mitre.org
Third Party Advisory
Source: cve@mitre.org
PatchThird Party Advisory
Source: cve@mitre.org
ExploitMitigationVendor Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
Mailing ListThird Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
PatchThird Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
ExploitMitigationVendor Advisory

Timeline

No history available yet.