# CVE-2024-38473: Apache HTTP Server proxy encoding problem

- Exploited (CISA KEV): no
- Published: 2024-07-01
- CVSS: 8.1 HIGH (v3.1)
- EPSS: 25.9% (98th percentile)
- CWE: CWE-116

Encoding problem in mod_proxy in Apache HTTP Server 2.4.59 and earlier allows request URLs with incorrect encoding to be sent to backend services, potentially bypassing authentication via crafted requests.
Users are recommended to upgrade to version 2.4.60, which fixes this issue.

## Edge WAF coverage (claimed by vendors, not measured)

| Vendor | Status | First rule | Days after publication |
|---|---|---|---|
| Cloudflare | Before feed history | — | — |
| AWS | No public claim | — | — |
| Microsoft Azure | No public claim | — | — |
| Google Cloud | No public claim | — | — |
| Fastly | Before feed history | — | — |
| F5 | Rule published | 2025-04-28 | — |
| Akamai | No public source | — | — |
| OWASP CRS | No public claim | — | — |

### F5

- 2025-04-28 · updated · rule 200007072
  > Updated: signature 200007072 "Apache mod_rewrite Filename Confusion" (Path Traversal, risk Low), systems: Apache. References: CVE-2024-39573, CVE-2024-38475, CVE-2024-38474, CVE-2024-38476, CVE-2024-38473.
  Source: https://docs.cloud.f5.com/docs-v2/platform/changelogs/security-details-changelog
- 2025-05-22 · updated · rule 200007072
  > Updated: signature 200007072 "Apache mod_rewrite Filename Confusion" (Path Traversal, risk Low), systems: Apache. References: CVE-2024-39573, CVE-2024-38475, CVE-2024-38474, CVE-2024-38476, CVE-2024-38473.
  Source: https://docs.cloud.f5.com/docs-v2/platform/changelogs/security-details-changelog

## Our test (measured)

- OWASP Core Rule Set 4.25.0, paranoia level 1, anomaly threshold 5, default CRS settings: passed (0 of 3 requests blocked), template CVE-2024-38473, 2026-11-02
- OWASP Core Rule Set 4.25.0, paranoia level 2, anomaly threshold 5, default CRS settings: passed (0 of 3 requests blocked), template CVE-2024-38473, 2026-11-02

"No public claim" means no vendor statement names this CVE; "Before feed history" means the CVE is older than the vendor feed. In both cases generic rules may still block it.

HTML: https://cve.vigilbase.com/cve/CVE-2024-38473 · JSON: https://cve.vigilbase.com/api/v1/cves/CVE-2024-38473