Is CVE-2023-50247 actively exploited?

CVE-2023-50247 has no public evidence of in-the-wild exploitation as of 2024-11-21.

What is the CVSS score for CVE-2023-50247?

CVE-2023-50247 has a CVSS score of 3.7 (LOW severity). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L.

How do I patch CVE-2023-50247?

Patch guidance is available from dena security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2023-50247.

Which products are affected by CVE-2023-50247?

3 products: dena h2o, dena h2o, dena h2o.

CVE-2023-50247 - remediation guidance & executive summary

Description

h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. The QUIC stack (quicly), as used by H2O up to commit 43f86e5 (in version 2.3.0-beta and prior), is susceptible to a state exhaustion attack. When H2O is serving HTTP/3, a remote attacker can exploit this vulnerability to progressively increase the memory retained by the QUIC stack. This can eventually cause H2O to abort due to memory exhaustion. The vulnerability has been resolved in commit d67e81d03be12a9d53dc8271af6530f40164cd35. HTTP/1 and HTTP/2 are not affected by this vulnerability as they do not use QUIC. Administrators looking to mitigate this issue without upgrading can disable HTTP/3 support.

CVSS Metrics

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack Vector: network
Complexity: high
Privileges: none
User Action: none
Scope: unchanged
Confidentiality: none
Integrity: none
Availability: low
Weaknesses: CWE-770

Metadata

Primary Vendor: DENA
Published: 12/12/2023
Last Modified: 11/21/2024
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

dena : h2odena : h2odena : h2o

Remediation Guidance

Executive Summary

Cite this page

CVE-2023-50247. CVEDatabase.com. Retrieved 1 May 2026. https://cvedatabase.com/cve/CVE-2023-50247

View on NIST NVD

CVE-2023-50247 vulnerability