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.
History

Tue, 12 Nov 2024 20:15:00 +0000

Type Values Removed Values Added
First Time appeared Dena
Dena h2o
CPEs cpe:2.3:a:dena:h2o:*:*:*:*:*:*:*:*
Vendors & Products Dena
Dena h2o

Fri, 11 Oct 2024 21:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 11 Oct 2024 14:45:00 +0000

Type Values Removed Values Added
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.
Title H2O assertion failure when HTTP/3 requests are cancelled
Weaknesses CWE-617
References
Metrics cvssV3_1

{'score': 3.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2024-10-11T14:28:35.262Z

Updated: 2024-10-11T14:40:53.132Z

Reserved: 2024-08-28T20:21:32.803Z

Link: CVE-2024-45403

cve-icon Vulnrichment

Updated: 2024-10-11T14:40:48.151Z

cve-icon NVD

Status : Analyzed

Published: 2024-10-11T15:15:05.123

Modified: 2024-11-12T19:59:51.097

Link: CVE-2024-45403

cve-icon Redhat

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