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Rewterz Threat Advisory – CVE-2021-23017 – F5 Nginx Code Execution Vulnerability

Severity

High

Analysis Summary

CVE-2021-23017

Nginx could allow a remote attacker to execute arbitrary code on the system, caused by an off-by-one error in ngx_resolver_copy() while processing DNS responses. By sending a specially crafted request, an attacker could exploit this vulnerability to execute arbitrary code on the system.

Impact

Unauthorized Access

Affected Vendors

F5

Affected Products

  • F5 NGINX Open Source 0.6.18
  • F5 NGINX Open Source 1.20.0
  • F5 NGINX Plus R13
  • F5 NGINX Plus R24

Remediation

Refer to F5 Security Advisory K36926027 for patch, upgrade or suggested workaround information. http://nginx.org/