CVE-2022-31813Network attack vector

Unauthenticated IP authorization bypass via stripped forwarding headers

Published Jun 8, 2022 · Updated Aug 3, 2024

Authentication bypass in Apache HTTP Server 2.4.53 and earlier allows remote attackers to evade origin IP restrictions. mod_proxy accepts a client-supplied Connection header naming X-Forwarded-* fields as hop-by-hop and removes those identity headers before forwarding the request. The flaw is reachable only when Apache operates as a reverse proxy and the origin trusts those forwarded headers for IP-based access control, allowing unauthorized access to protected origin resources.

CVSS severity9.8
Critical
EPSS probability3.54%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Apache HTTP Server 2.4.53 and earlier allows remote attackers to evade origin IP restrictions. mod_proxy accepts a client-supplied Connection header naming X-Forwarded-* fields as hop-by-hop and removes those identity headers before forwarding the request. The flaw is reachable only when Apache operates as a reverse proxy and the origin trusts those forwarded headers for IP-based access control, allowing unauthorized access to protected origin resources.

The record

CVE
CVE-2022-31813
Published
Jun 8, 2022
Updated
Aug 3, 2024
Vendor
The Apache Software Foundation
Product
Apache HTTP Server
Classifications
CWE-345, CWE-348, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 8, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Apache HTTP Server 2.4 <=2.4.53

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache HTTP Serverversion=Apache HTTP Server 2.4 <=2.4.53

Published CVSS scores

7.3Amazon LinuxCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
9.8Oracle LinuxCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-345Insufficient Verification of Data Authenticity
CWE-348Use of Less Trusted Source
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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