Is CVE-2025-43863 actively exploited?

No active exploitation of CVE-2025-43863 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2025-43863 be exploited remotely?

Yes. CVE-2025-43863 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2025-43863?

CVE-2025-43863 has a CVSS score of 9.8 (CRITICAL).

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CRITICAL

CVE-2025-43863

CWE-307Published: June 12, 2025· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

vantage6 is an open source framework built to enable, manage and deploy privacy enhancing technologies like Federated Learning and Multi-Party Computation. If attacker gets access to an authenticated session, they can try to brute-force the user password by using the change password functionality: they can call that route infinitely which will return the message that password is wrong until it is correct. This vulnerability is fixed in 4.11.

NVD Source

Technical Analysis

CVE-2025-43863 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), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.