---
title: "CVE-2023-43622: Apache HTTP Server: DoS in HTTP/2… | CubePath"
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…"
language: en
source: https://cubepath.com/security/cve/CVE-2023-43622
---

# CVE-2023-43622: Apache HTTP Server: DoS in HTTP/2… | CubePath

## 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.

Official description from the CVE record, published by apache. Copyright © 1999-2026 The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CVE license. [View the record on cve.org](https://www.cve.org/CVERecord?id=CVE-2023-43622)

## Key data

### EPSS

Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.

Score

0.68818 (68.8% probability)

Percentile

99.4%

Scores of

Nov 10, 2026

Model

v2026.06.15

### CISA assessment as of Sep 11, 2024

Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA.

Exploitation

Public proof of concept recorded by CISA

Automatable

yes

Technical impact

partial

### Weakness (CWE)

CWE catalog version 5.0.

CWE names: Copyright © 2006-2026, The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CWE license.

- [CWE-400](https://cwe.mitre.org/data/definitions/400.html) Uncontrolled Resource Consumption

## Affected products

Products listed in the CVE record, as the CNA published them.

- Apache HTTP Server

  - affected: 2.4.55 up to 2.4.57

## References

Links listed in the CVE record. They lead to other sites, which CubePath does not control.

- [httpd.apache.org/security/vulnerabilities\_24.html](https://httpd.apache.org/security/vulnerabilities%5F24.html) vendor-advisory
- [security.netapp.com/advisory/ntap-20231027-0011](https://security.netapp.com/advisory/ntap-20231027-0011/)

## Timeline

1. ID reserved Sep 20, 2023
2. Record published Oct 23, 2023
3. Record last updated Feb 13, 2025

## Look up another CVE

## About CubePath

CubePath is a cloud provider with data centers in Europe and the United States. It offers VPS, bare metal servers and DDoS protection.

[Cloud VPS](https://cubepath.com/vps) [DDoS protection](https://cubepath.com/ddos-protection)

Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 20:03 UTC. [Sources and licenses](https://cubepath.com/security/cve/legal)