CVE-2025-43931

Critical

Published: 07 July 2025

Published

07 July 2025

Modified

15 April 2026

KEV Added

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Patch

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CVSS Score v3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Score 0.0035 57.7th percentile

Risk Priority 20 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2025-43931 is a critical-severity Weak Password Recovery Mechanism for Forgotten Password (CWE-640) vulnerability. Its CVSS base score is 9.8 (Critical).

Operationally, ranked in the top 42.3% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2025-20241

Vulnerability details

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.

CWE(s): CWE-640

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

IA-5 Authenticator Management

addresses: CWE-640

Establishing procedures for lost or compromised authenticators addresses weak password recovery mechanisms.