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CVE-2022-31813

CriticalPublished

mod_proxy X-Forwarded-For dropped by hop-by-hop mechanism

Published: Jun 8, 2022
Updated: Aug 3, 2024
Assigning CNA: apache
Evidence observed: Aug 8, 2026

Primary CVSS

9.8/ 10Critical

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS probability estimate

3.5%

Low · next 30 days

Percentile: 88.8%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

Apache HTTP Server 2.4.53 and earlier may not send the X-Forwarded-* headers to the origin server based on client side Connection header hop-by-hop mechanism. This may be used to bypass IP based authentication on the origin server/application.

Sources

cve-2022-31813Scanner
tester for cve-2022-31813
CVE-2022-31813PoC
Demonstrates CVE-2022-31813 Apache HTTP Server bypass using X-Real-IP header manipulation to evade access controls, with a Docker-based test environment for security researchers.

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