Is CVE-2024-25622 actively exploited?

No active exploitation of CVE-2024-25622 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2024-25622 be exploited remotely?

Yes. CVE-2024-25622 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2024-25622?

CVE-2024-25622 has a CVSS score of 4.3 (MEDIUM).

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MEDIUM

CVE-2024-25622

CWE-670Published: October 11, 2024· Updated: Jun 17, 2026

4.3

CVSS v3.1

Official Description

h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. The configuration directives provided by the headers handler allows users to modify the response headers being sent by h2o. The configuration file of h2o has scopes, and the inner scopes (e.g., path level) are expected to inherit the configuration defined in outer scopes (e.g., global level). However, if a header directive is used in the inner scope, all the definition in outer scopes are ignored. This can lead to headers not being modified as expected. Depending on the headers being added or removed unexpectedly, this behavior could lead to unexpected client behavior. This vulnerability is fixed in commit 123f5e2b65dcdba8f7ef659a00d24bd1249141be.

NVD Source

Technical Analysis

CVE-2024-25622 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.