CVE-2024-45403
H2O assertion failure when HTTP/3 requests are cancelled
Severity Score
3.7
*CVSS v3.1
Exploit Likelihood
*EPSS
Affected Versions
*CPE
Public Exploits
0
*Multiple Sources
Exploited in Wild
-
*KEV
Decision
Track
*SSVC
Descriptions
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.
*Credits:
N/A
CVSS Scores
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
* Common Vulnerability Scoring System
SSVC
- Decision:Track
Exploitation
Automatable
Tech. Impact
* Organization's Worst-case Scenario
Timeline
- 2024-08-28 CVE Reserved
- 2024-10-11 CVE Published
- 2024-10-11 CVE Updated
- 2024-10-12 EPSS Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
- CWE-617: Reachable Assertion
CAPEC
References (4)
| URL | Tag | Source |
|---|---|---|
| https://github.com/h2o/h2o/commit/16b13eee8ad7895b4fe3fcbcabee53bd52782562 | X_refsource_misc | |
| https://github.com/h2o/h2o/commit/1ed32b23f999acf0c5029f09c8525f93eb1d354c | X_refsource_misc | |
| https://github.com/h2o/h2o/security/advisories/GHSA-4xp5-3jhc-3m92 | X_refsource_confirm | |
| https://h2o.examp1e.net/configure/http3_directives.html | X_refsource_misc |
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