VDB
DEBIAN-CVE-2021-42717
DEBIAN-CVE-2021-42717
PUBLISHED
CVSS 7.5 HIGH
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.
Risk Scores
CVSS v3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Debian:11 | modsecurity-apache | 0, 2.9.3-3, 2.9.3-3 |
| Debian:14 | modsecurity | 0, 0, 0 |
| Debian:11 | modsecurity | 3.0.4-2, 3.0.6-1, 3.0.8-2 |
| Debian:13 | modsecurity | 0, 0, 0 |
| Debian:12 | modsecurity | 0, 0, 0 |
| Debian:13 | modsecurity-apache | 0, 0, 0 |
| Debian:12 | modsecurity-apache | 0, 0, 0 |
| Debian:14 | modsecurity-apache | 0, 0, 0 |
Timeline
- Dec 7, 2021 CVE Published
- Apr 28, 2026 CVE Updated