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CVE-2024-45403

3.7 · LOW

h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3.

Published Oct 11, 2024CWE-617EPSS 0.65%

Overview

CVE-2024-45403 is a low-severity vulnerability. It was published on October 11, 2024 and has a CVSS 3.1 base score of 3.7 (LOW).

This vulnerability has a CVSS 3.1 base score of 3.7, rated LOW. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/h2o/h2o/commit/16b13eee8ad7895b4fe3fcbcabee53bd52782562GitHubgithub.com/h2o/h2o/commit/1ed32b23f999acf0c5029f09c8525f93eb1d354cGitHubgithub.com/h2o/h2o/security/advisories/GHSA-4xp5-3jhc-3m92Refh2o.examp1e.net/configure/http3_directives.html

How CyberStrike helps

Frequently asked questions

What is CVE-2024-45403?

CVE-2024-45403 is a low-severity vulnerability. It was published on October 11, 2024 and has a CVSS 3.1 base score of 3.7 (LOW).

How severe is CVE-2024-45403?

This vulnerability has a CVSS 3.1 base score of 3.7, rated LOW. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2024-45403?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2024-45403?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-45403 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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