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CVE-2021-31618— NULL pointer dereference on specially crafted HTTP/2 request

EPSS 11.00% · P93
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I. Basic Information for CVE-2021-31618

Vulnerability Information
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Vulnerability Title
NULL pointer dereference on specially crafted HTTP/2 request
Source: NVD (National Vulnerability Database)
Vulnerability Description
Apache HTTP Server protocol handler for the HTTP/2 protocol checks received request headers against the size limitations as configured for the server and used for the HTTP/1 protocol as well. On violation of these restrictions and HTTP response is sent to the client with a status code indicating why the request was rejected. This rejection response was not fully initialised in the HTTP/2 protocol handler if the offending header was the very first one received or appeared in a a footer. This led to a NULL pointer dereference on initialised memory, crashing reliably the child process. Since such a triggering HTTP/2 request is easy to craft and submit, this can be exploited to DoS the server. This issue affected mod_http2 1.15.17 and Apache HTTP Server version 2.4.47 only. Apache HTTP Server 2.4.47 was never released.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
空指针解引用
Source: NVD (National Vulnerability Database)
Vulnerability Title
EasyApache 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
EasyApache是Apache基金会的一个功能强大且易于使用的工具，内置在WHM/cPanel中，可以使用它来更新和配置Apache web服务器。 EasyApache 存在代码问题漏洞，该漏洞源于将NULL指针指向MOD_HTTP2、MOD_SESSION和MOD_PROXY_HTTP。
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

VendorProductAffected VersionsCPESubscribe
Apache Software FoundationApache HTTP Server 2.4.47 -

II. Public POCs for CVE-2021-31618

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III. Intelligence Information for CVE-2021-31618

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IV. Related Vulnerabilities

Same product: Apache HTTP Server
Same vendor: Apache Software Foundation
Same weakness: CWE-476

V. Comments for CVE-2021-31618

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