Is CVE-2025-43931 actively exploited?

No active exploitation of CVE-2025-43931 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2025-43931 be exploited remotely?

Yes. CVE-2025-43931 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2025-43931?

CVE-2025-43931 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2025-43931

CRITICAL

CVE-2025-43931

CWE-640Published: July 7, 2025· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

flask-boilerplate through a170e7c allows account takeover via the password reset feature because SERVER_NAME is not configured and thus a reset depends on the Host HTTP header.

NVD Source

Technical Analysis

CVE-2025-43931 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.