Is CVE-2024-45397 actively exploited?

CVE-2024-45397 has no public evidence of in-the-wild exploitation as of 2024-11-12.

What is the CVSS score for CVE-2024-45397?

CVE-2024-45397 has a CVSS score of 5.9 (MEDIUM severity). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.

How do I patch CVE-2024-45397?

Patch guidance is available from dena security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2024-45397.

CVE-2024-45397 - remediation guidance & executive summary

Description

h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. When an HTTP request using TLS/1.3 early data on top of TCP Fast Open or QUIC 0-RTT packets is received and the IP-address-based access control is used, the access control does not detect and prohibit HTTP requests conveyed by packets with a spoofed source address. This behavior allows attackers on the network to execute HTTP requests from addresses that are otherwise rejected by the address-based access control. The vulnerability has been addressed in commit 15ed15a. Users may disable the use of TCP FastOpen and QUIC to mitigate the issue.

CVSS Metrics

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack Vector: network
Complexity: high
Privileges: none
User Action: none
Scope: unchanged
Confidentiality: high
Integrity: none
Availability: none
Weaknesses: CWE-284 CWE-290

Metadata

Primary Vendor: DENA
Published: 10/11/2024
Last Modified: 11/12/2024
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

dena : h2o

Remediation Guidance

Executive Summary

Cite this page

CVE-2024-45397. CVEDatabase.com. Retrieved 1 May 2026. https://cvedatabase.com/cve/CVE-2024-45397

View on NIST NVD

CVE-2024-45397 vulnerability