IP address spoofing in Apache HTTP Server

Published: 2020-08-08
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2020-11985
Exploitation vector Network
Public exploit N/A
Vulnerable software
Apache HTTP Server
Server applications / Web servers

Vendor Apache Foundation

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Input validation error

EUVDB-ID: #VU35776

Risk: Medium


CVE-ID: CVE-2020-11985

CWE-ID: CWE-20 - Improper Input Validation

Exploit availability: No


The vulnerability allows a remote attacker to perform a spoofing attack.

The vulnerability exists due to insufficient validation of user-supplied input. A remote attacker can spoof the user's IP address when proxying using mod_remoteip and mod_rewrite, as a result the fake IP address will be displayed in logs and will be passed to PHP scripts.

Depending on web application functionality this vulnerability can be used to bypass authorization checks based on IP addresses.


Install updates from vendor's website.

Vulnerable software versions

Apache HTTP Server: 2.4.1 - 2.4.23

CPE2.3 External links


Q & A

Can this vulnerability be exploited remotely?

How the attacker can exploit this vulnerability?

Is there known malware, which exploits this vulnerability?