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CVE-2023-43622— Apache HTTP Server: DoS in HTTP/2 with initial windows size 0

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）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 2.4.55版本至2.4.57版本存在资源管理错误漏洞，该漏洞源于攻击者打开初始窗口大小为0的HTTP/2连接，能够无限期地阻止Apache HTTP Server中对该连接的处理，这可以耗尽服务器中的工作资源。

AI Predicted 5.3 Difficulty: Easy EPSS 70.59% · P99

Possible ATT&CK Techniques 1 AI

T1499.001 · OS Exhaustion Flood
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I. Basic Information for CVE-2023-43622

Vulnerability Information
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Vulnerability Title
Apache HTTP Server: DoS in HTTP/2 with initial windows size 0
Source: CVE Program / CVE List V5
Vulnerability Description
An attacker, opening a HTTP/2 connection with an initial window size of 0, was able to block handling of that connection indefinitely in Apache HTTP Server. This could be used to exhaust worker resources in the server, similar to the well known "slow loris" attack pattern. This has been fixed in version 2.4.58, so that such connection are terminated properly after the configured connection timeout. This issue affects Apache HTTP Server: from 2.4.55 through 2.4.57. Users are recommended to upgrade to version 2.4.58, which fixes the issue.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Apache HTTP Server 资源管理错误漏洞
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 2.4.55版本至2.4.57版本存在资源管理错误漏洞，该漏洞源于攻击者打开初始窗口大小为0的HTTP/2连接，能够无限期地阻止Apache HTTP Server中对该连接的处理，这可以耗尽服务器中的工作资源。
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 2.4.55 ~ 2.4.57 -

II. Public POCs for CVE-2023-43622

# POC Description Source Link Shenlong Link
1 CVE-2023–43622 https://github.com/visudade/CVE-2023-43622 POC Details
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III. Intelligence Information for CVE-2023-43622

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Vendor Advisories for CVE-2023-43622 (2)

Same Patch Batch · Apache Software Foundation · 2023-10-23 · 4 CVEs total

CVE-2023-46288 Apache Airflow: Sensitive parameters exposed in API when "non-sensitive-only" configuratio
CVE-2023-31122 Apache HTTP Server: mod_macro buffer over-read
CVE-2023-45802 Apache HTTP Server: HTTP/2 stream memory not reclaimed right away on RST

IV. Related Vulnerabilities

Same product: Apache HTTP Server
Same vendor: Apache Software Foundation
Same weakness: CWE-400

V. Comments for CVE-2023-43622

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