CVE-2021-42717
At a glance
- Source
- NVD
- EPSS
- EPSS 3.25 % · percentile 88 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- mitre
- NVD status
- Modified
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.
Weaknesses (CWE)
- CWE-674 — Uncontrolled Recursion
References
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | NVD · nvd@nist.gov (Primary) |
| CVSS 2.0 | MEDIUM 5.0 | AV:N/AC:L/Au:N/C:N/I:N/A:P | NVD · nvd@nist.gov (Primary) |
European references
- ENISA EUVD · EUVD-2021-29677
- GCVE · GCVE-0-2021-42717
CERT-FR advisories
- CERTFR-2022-AVI-792 — Multiples vulnérabilités dans les produits F5 · cert.ssi.gouv.fr
- CERTFR-2021-AVI-918 — Vulnérabilité dans F5 NGINX · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:a:owasp:modsecurity:*:*:*:*:*:*:*:*≥ 3.0.0 < 3.0.6cpe:2.3:a:trustwave:modsecurity:*:*:*:*:*:*:*:*≥ 2.0.0 < 2.9.5cpe:2.3:a:f5:nginx_modsecurity_waf:r24:*:*:*:*:*:*:*cpe:2.3:a:f5:nginx_modsecurity_waf:r25:*:*:*:*:*:*:*cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*cpe:2.3:a:oracle:http_server:12.2.1.3.0:*:*:*:*:*:*:*cpe:2.3:a:oracle:http_server:12.2.1.4.0:*:*:*:*:*:*:*cpe:2.3:a:oracle:zfs_storage_appliance_kit:8.8:*:*:*:*:*:*:*
Affected products
| Product | Versions |
|---|---|
| affected n/a |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |