CVE-2021-33193— Request splitting via HTTP/2 method injection and mod_proxy
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I. Basic Information for CVE-2021-33193
Vulnerability Information
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Vulnerability Title
Request splitting via HTTP/2 method injection and mod_proxy
Source: NVD (National Vulnerability Database)
Vulnerability Description
A crafted method sent through HTTP/2 will bypass validation and be forwarded by mod_proxy, which can lead to request splitting or cache poisoning. This issue affects Apache HTTP Server 2.4.17 to 2.4.48.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
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）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 2.4.17 至 2.4.48 版本存在安全漏洞，该漏洞可通过HTTP/2发送的精心制作的方法绕过身份验证，并由mod_proxy转发。
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)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Apache Software Foundation | Apache HTTP Server | Apache HTTP Server 2.4 2.4.17 to 2.4.48 | - |
II. Public POCs for CVE-2021-33193
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|---|
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IV. Related Vulnerabilities
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Apache HTTP Server: http2: double free and possible RCE on e - CVE-2026-33006
Apache HTTP Server: mod_auth_digest timing attack
Same vendor: Apache Software Foundation
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