CVE-2025-6544
H2O-3 Deserialization Remote Code Execution
Description
A deserialization vulnerability exists in h2oai/h2o-3 versions <= 3.46.0.8, allowing attackers to read arbitrary system files and execute arbitrary code. The vulnerability arises from improper handling of JDBC connection parameters, which can be exploited by bypassing regular expression checks and using double URL encoding. This issue impacts all users of the affected versions.
INFO
Published Date :
Sept. 21, 2025, 11:08 a.m.
Last Modified :
Sept. 21, 2025, 11:08 a.m.
Remotely Exploit :
Yes !
Source :
None
Affected Products
The following products are affected by CVE-2025-6544
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.0 | CRITICAL | MITRE-CVE |
Solution
- Update H2O-3 to version 3.46.0.9 or later.
- Apply vendor patches for earlier versions if available.
- Restrict access to JDBC connection parameters.
- Monitor system logs for suspicious activity.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-6544.
| URL | Resource |
|---|---|
| https://huntr.com/bounties/53f35a0f-d644-4f82-93aa-89fe7e0aed40 | |
| https://github.com/h2oai/h2o-3/commit/0298ee348f5c73673b7b542158081e79605f5f25 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-6544 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-6544
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-6544 vulnerability anywhere in the article.