Is CVE-2024-45397 actively exploited?

No active exploitation of CVE-2024-45397 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2024-45397 be exploited remotely?

Yes. CVE-2024-45397 is exploitable remotely over the network (CVSS attack vector: Network).

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

CVE-2024-45397 has a CVSS score of 7.5 (HIGH).

HOME VULNERABILITIESCVE-2024-45397

HIGH

CVE-2024-45397

CWE-284Published: October 11, 2024· Updated: Jun 17, 2026

7.5

CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2024-45397 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 7.5.