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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Affected Vendors & Products
References
History
Wed, 16 Jul 2025 13:45:00 +0000
Type | Values Removed | Values Added |
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Metrics |
epss
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epss
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Thu, 03 Jul 2025 21:15:00 +0000
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First Time appeared |
Owasp
Owasp modsecurity |
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CPEs | cpe:2.3:a:owasp:modsecurity:*:*:*:*:*:*:*:* | |
Vendors & Products |
Owasp
Owasp modsecurity |

Status: PUBLISHED
Assigner: mitre
Published: 2021-12-07T21:08:28
Updated: 2024-08-04T03:38:49.325Z
Reserved: 2021-10-19T00:00:00
Link: CVE-2021-42717

No data.

Status : Modified
Published: 2021-12-07T22:15:06.950
Modified: 2025-07-03T20:59:18.650
Link: CVE-2021-42717

No data.