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CVE-2016-4975— mod_userdir CRLF injection

Quick assessment

Affected
Apache Software Foundation Apache HTTP Server
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Apache HTTP Server是美国阿帕奇（Apache）软件基金会的一款开源网页服务器。该服务器具有快速、可靠且可通过简单的API进行扩充的特点。 Apache HTTP Server 2.4.1版本至2.4.23版本和2.2.0版本至2.2.31版本中存在安全漏洞。攻击者可利用该漏洞实施HTTP响应拆分攻击。

AI Predicted 7.5 Difficulty: Easy EPSS 19.80% · P97

Public Exploits 1

Nuclei · 1 CVE-2016-4975.yaml [template]
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I. Basic Information for CVE-2016-4975

Vulnerability Information
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Vulnerability Title
mod_userdir CRLF injection
Source: CVE Program / CVE List V5
Vulnerability Description
Possible CRLF injection allowing HTTP response splitting attacks for sites which use mod_userdir. This issue was mitigated by changes made in 2.4.25 and 2.2.32 which prohibit CR or LF injection into the "Location" or other outbound header key or value. Fixed in Apache HTTP Server 2.4.25 (Affected 2.4.1-2.4.23). Fixed in Apache HTTP Server 2.2.32 (Affected 2.2.0-2.2.31).
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Apache HTTP Server 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache HTTP Server是美国阿帕奇（Apache）软件基金会的一款开源网页服务器。该服务器具有快速、可靠且可通过简单的API进行扩充的特点。 Apache HTTP Server 2.4.1版本至2.4.23版本和2.2.0版本至2.2.31版本中存在安全漏洞。攻击者可利用该漏洞实施HTTP响应拆分攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache HTTP Server Fixed in Apache HTTP Server 2.4.25 (Affected 2.4.1-2.4.23) -

II. Public POCs for CVE-2016-4975

# POC Description Source Link Shenlong Link
1 Apache CRLF injection allowing HTTP response splitting attacks on sites using mod_userdir. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2016/CVE-2016-4975.yaml POC Details
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III. Intelligence Information for CVE-2016-4975

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Vendor Advisories for CVE-2016-4975 (4)

Mailing List Discussions for CVE-2016-4975 (19)

Other References for CVE-2016-4975 (1)

IV. Related Vulnerabilities

Same product: Apache HTTP Server
Same vendor: Apache Software Foundation

V. Comments for CVE-2016-4975

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