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Mitigation Instructions for CVE-2022-31813

Mitigation Instructions for CVE-2022-31813

SUBJECT: CVE-2022-31813 IP based authentication bypass

TECH STACK: Apache HTTP Server versions 2.4.0 through 2.4.55

DATE(S) ISSUED: 06/09/2022

NVD Last Modified: 08/19/2022



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.


Mitigation instructions for CVE-2022-31813 (Apache HTTP Server mod_proxy X-Forwarded-For):

  1. Update Apache HTTP Server: Ensure that you are using the latest version of Apache HTTP Server. Check the Apache website or your distribution's security advisories for updates.

  2. Disable mod_proxy: If you are not using the mod_proxy module, disable it in the Apache HTTP Server configuration to mitigate the vulnerability.

  3. Implement Access Control: Configure access control rules to restrict access to sensitive resources and prevent unauthorized requests from reaching the backend servers.

  4. Implement Web Application Firewall (WAF): Deploy a WAF to provide an additional layer of protection against potential attacks targeting the mod_proxy module.

  5. Regularly monitor and review logs: Monitor the server logs for any suspicious activity, including unexpected HTTP headers or anomalies in the X-Forwarded-For header.

  6. Follow security best practices: Implement secure coding practices, use secure configurations, and regularly update and patch all software components in your infrastructure.

  7. Stay informed: Keep track of security advisories and updates from the Apache HTTP Server project and other relevant sources to stay informed about any new developments or patches related to CVE-2022-31813.

Note: It is important to thoroughly test any configuration changes or updates in a controlled environment before applying them to a production system.


  1. NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-31813
  2. MITRE: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-31813
  3. CONFIRM: https://security.netapp.com/advisory/ntap-20220624-0005/
  4. FEDORA:FEDORA-2022-b54a8dee29 - Link
  5. FEDORA:FEDORA-2022-e620fb15d5 - Link
  6. GENTOO:GLSA-202208-20 - Link
  7. MISC: Apache HTTP Server Vulnerabilities - Link
  8. MLIST: [oss-security] 20220608 CVE-2022-31813 - Link
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