Is CVE-2024-45403 actively exploited?

CVE-2024-45403 has no public evidence of in-the-wild exploitation as of 2024-11-12.

What is the CVSS score for CVE-2024-45403?

CVE-2024-45403 has a CVSS score of 3.7 (LOW severity). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L.

How do I patch CVE-2024-45403?

Patch guidance is available from dena security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2024-45403.

CVE-2024-45403 - remediation guidance & executive summary

Description

h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. When h2o is configured as a reverse proxy and HTTP/3 requests are cancelled by the client, h2o might crash due to an assertion failure. The crash can be exploited by an attacker to mount a Denial-of-Service attack. By default, the h2o standalone server automatically restarts, minimizing the impact. However, HTTP requests that were served concurrently will still be disrupted. The vulnerability has been addressed in commit 1ed32b2. Users may disable the use of HTTP/3 to mitigate the issue.

CVSS Metrics

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack Vector: network
Complexity: high
Privileges: none
User Action: none
Scope: unchanged
Confidentiality: none
Integrity: none
Availability: low
Weaknesses: CWE-617

Metadata

Primary Vendor: DENA
Published: 10/11/2024
Last Modified: 11/12/2024
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

dena : h2o

Remediation Guidance

Executive Summary

Cite this page

CVE-2024-45403. CVEDatabase.com. Retrieved 1 May 2026. https://cvedatabase.com/cve/CVE-2024-45403

View on NIST NVD

CVE-2024-45403 vulnerability