CVE-2021-42717

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Source
https://cve.org/CVERecord?id=CVE-2021-42717
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-42717.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2021-42717
Aliases
Downstream
Related
Published
2021-12-07T22:15:06.950Z
Modified
2026-05-15T12:04:21.307223066Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
[none]
Details

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.

Database specific 
{
    "unresolved_ranges": [
        {
            "cpes": [
                "cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*",
                "cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*",
                "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"
            ],
            "source": "CPE_FIELD",
            "vendor_product": "debian:debian_linux",
            "extracted_events": [
                {
                    "last_affected": "9.0"
                },
                {
                    "last_affected": "10.0"
                },
                {
                    "last_affected": "11.0"
                }
            ]
        },
        {
            "cpes": [
                "cpe:2.3:a:f5:nginx_modsecurity_waf:r24:*:*:*:*:*:*:*",
                "cpe:2.3:a:f5:nginx_modsecurity_waf:r25:*:*:*:*:*:*:*"
            ],
            "source": "CPE_FIELD",
            "vendor_product": "f5:nginx_modsecurity_waf",
            "extracted_events": [
                {
                    "last_affected": "r24"
                },
                {
                    "last_affected": "r25"
                }
            ]
        },
        {
            "cpes": [
                "cpe:2.3:a:oracle:http_server:12.2.1.3.0:*:*:*:*:*:*:*",
                "cpe:2.3:a:oracle:http_server:12.2.1.4.0:*:*:*:*:*:*:*"
            ],
            "source": "CPE_FIELD",
            "vendor_product": "oracle:http_server",
            "extracted_events": [
                {
                    "last_affected": "12.2.1.3.0"
                },
                {
                    "last_affected": "12.2.1.4.0"
                }
            ]
        },
        {
            "cpes": [
                "cpe:2.3:a:oracle:zfs_storage_appliance_kit:8.8:*:*:*:*:*:*:*"
            ],
            "vendor_product": "oracle:zfs_storage_appliance_kit",
            "source": "CPE_FIELD",
            "extracted_events": [
                {
                    "last_affected": "8.8"
                }
            ]
        }
    ]
}
References

Affected packages