CVE-2024-45403 is a Denial-of-Service vulnerability affecting the h2o HTTP server when configured as a reverse proxy and handling HTTP/3 requests. A remote attacker can trigger an assertion failure and crash the server by cancelling HTTP/3 requests, disrupting concurrent HTTP traffic. Rated 7.5 HIGH (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H), this vulnerability is easily exploitable with low attack complexity and no user interaction required. While the standalone server typically restarts, the issue is patched in commit 1ed32b2, and disabling HTTP/3 is a viable mitigation; there is currently no evidence of active exploitation, public exploit code, or significant community discussion.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 2024-06-18, < 2024-09-04CPE matchmatch criteria | cpe:2.3:a:dena:h2o:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
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