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Rewterz Threat Advisory – CVE-2021-42717 – F5 NGINX ModSecurity WAF

Severity

Medium

Analysis Summary

CVE-2021-42717

F5 NGINX ModSecurity WAF is vulnerable to a denial of service, caused by an uncontrolled recursion flaw. By sending specially-crafted JSON messages, a remote attacker could exploit this vulnerability to cause high resource utilization and results in a denial of service condition.

Impact

  • Denial of Service

Affected Vendors

F5

Affected Products

  • F5 NGINX ModSecurity WAF R24
  • F5 NGINX ModSecurity WAF R25

Remediation

Refer to F5 Security Advisory for patch, upgrade or suggested workaround information.

https://support.f5.com/csp/article/K50839343