Vulnerability 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 Score
LOW
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Dena | H2O | >= 2024-06-18, < 2024-09-04 |
Related Weaknesses (CWE)
References
- https://github.com/h2o/h2o/commit/16b13eee8ad7895b4fe3fcbcabee53bd52782562Patch
- https://github.com/h2o/h2o/commit/1ed32b23f999acf0c5029f09c8525f93eb1d354cPatch
- https://github.com/h2o/h2o/security/advisories/GHSA-4xp5-3jhc-3m92Vendor Advisory
- https://h2o.examp1e.net/configure/http3_directives.htmlProduct
FAQ
What is CVE-2024-45403?
CVE-2024-45403 is a vulnerability with a CVSS score of 3.7 (LOW). 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 failu...
How severe is CVE-2024-45403?
CVE-2024-45403 has been rated LOW with a CVSS base score of 3.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2024-45403?
Check the references section above for vendor advisories and patch information. Affected products include: Dena H2O.