Vulnerability in F5 Nginx_modsecurity_waf
CVE-2021-42717
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., 3…
EPSS: 0.032 (86.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- F5 Nginx_modsecurity_waf — versions r24, r25
- Oracle Http_server — versions 12.2.1.3.0, 12.2.1.4.0
- Oracle Zfs_storage_appliance_kit — versions 8.8
- Owasp Modsecurity
- Trustwave Modsecurity
- Debian Debian_linux — versions 9.0, 10.0, 11.0
- N/a — versions n/a
Weakness classification (CWE)
Public proof-of-concept exploits
References
- cve@mitre.org (vendor-advisory, Third Party Advisory, x_refsource_DEBIAN)
- cve@mitre.org (Patch, Third Party Advisory, x_refsource_MISC)
- cve@mitre.org (Exploit, x_refsource_MISC, Mitigation, Vendor Advisory)
- cve@mitre.org (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-42717?
- CVE-2021-42717 is a high-severity vulnerability in F5 Nginx_modsecurity_waf, classified under Uncontrolled Recursion. CVSS score: 7.5/10. Published 2021-12-07.
- How severe is CVE-2021-42717?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2021-42717 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.