CVE-2021-42717
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.
Risk Information
Base Score
7.5
MODERATE
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS Score
Exploitation Probability
2.04
Associated Vulnerability
| Vulnerability | OS Platform |
|---|---|
| Multiple vulnerabilities are affected in Oracle HTTP Server 12.2.1.4.0 | Windows |
| Tighten web applications security for Apache (USN-6370-1) libapache2-modsecurity_2.7.7-2_all.deb | Linux |
| Tighten web applications security for Apache (USN-6370-1) libapache2-modsecurity_2.9.0-1_all.deb | Linux |
| Tighten web applications security for Apache (USN-6370-1) libapache2-mod-security2_2.9.3-1ubuntu0.1_amd64.deb | Linux |
| Tighten web applications security for Apache (USN-6370-1) libapache2-mod-security2_2.7.7-2_i386.deb | Linux |
| Tighten web applications security for Apache (USN-6370-1) libapache2-mod-security2_2.7.7-2_amd64.deb | Linux |
| Tighten web applications security for Apache (USN-6370-1) libapache2-mod-security2_2.9.0-1_i386.deb | Linux |
| Tighten web applications security for Apache (USN-6370-1) libapache2-mod-security2_2.9.0-1_amd64.deb | Linux |
| Tighten web applications security for Apache (USN-6370-1) libapache2-mod-security2_2.9.2-1_i386.deb | Linux |
| Tighten web applications security for Apache (USN-6370-1) libapache2-mod-security2_2.9.2-1_amd64.deb | Linux |
| Tighten web applications security for Apache (USN-6370-1) libapache2-mod-security2_2.9.5-1_amd64.deb | Linux |
| modsecurity-apache security update(DSA-5023-1) libapache2-mod-security2_2.9.3-3+deb11u1_i386.deb | Linux |
| modsecurity-apache security update(DSA-5023-1) libapache2-mod-security2_2.9.3-3+deb11u1_amd64.deb | Linux |
| modsecurity-apache security update(DSA-5023-1) libapache2-mod-security2_2.9.3-1+deb10u1_i386.deb | Linux |
| modsecurity-apache security update(DSA-5023-1) libapache2-mod-security2_2.9.3-1+deb10u1_amd64.deb | Linux |
| Uncontrolled Recursion Vulnerability (CVE-2021-42717) | NCM |
Patch Details
No records foundReferences
https://nvd.nist.gov/vuln/detail/CVE-2023-1234
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-1234