What is CVE-2025-0896?

CVE-2025-0896 is a critical-severity vulnerability in Orthanc Server, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2025-02-13.

How severe is CVE-2025-0896?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Auth bypass in Orthanc Server

CVE-2025-0896

Orthanc server prior to version 1.5.8 does not enable basic authentication by default when remote access is enabled. This could result in unauthorized access by an attacker.

Vulnerability class: Broken Authentication

Published 2025-02-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.025 (83.9th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 84th percentile — 83.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.024 · newest: 0.025 · change: +0.000

Affected products

Orthanc Server — versions 0
Orthanc-Server Orthanc

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

References

www.cisa.gov/news-events/ics-medical-advisories/icsma-25-037-02 (US Government Resource, Third Party Advisory)

Frequently asked questions

What is CVE-2025-0896?: CVE-2025-0896 is a critical-severity vulnerability in Orthanc Server, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2025-02-13.
How severe is CVE-2025-0896?: Critical severity. CVSS v3 base score is 9.8 out of 10.