CVE-2023-45132: IgnoreIP/IgnoreCIDR should not trust X-Forwarded-For

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-10-11 · updated 2026-06-17
Weakness: CWE-693

Description

NAXSI is an open-source maintenance web application firewall (WAF) for NGINX. An issue present starting in version 1.3 and prior to version 1.6 allows someone to bypass the WAF when a malicious `X-Forwarded-For` IP matches `IgnoreIP` `IgnoreCIDR` rules. This old code was arranged to allow older NGINX versions to also support `IgnoreIP` `IgnoreCIDR` when multiple reverse proxies were present. The issue is patched in version 1.6. As a workaround, do not set any `IgnoreIP` `IgnoreCIDR` for older versions.

Affected products

wargio naxsi: from 1.3 before 1.6 — fixed in 1.6

How to fix

Upgrade to a fixed version: wargio naxsi 1.6. Check the vendor advisory for mitigations.

References

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