Vulnerability in Altium Designer
CVE-2025-27377
Altium Designer version 24.9.0 does not validate self-signed server certificates for cloud connections. An attacker capable of performing a man-in-the-middle (MITM) attack could exploit this issue to intercept or manipulate network traffic, potentially exposing authentication credentials or sensitive design data.
Vulnerability class: Improper Certificate Validation
EPSS: 0.002 (7.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N.
Affected products
- Altium Designer — versions 24.9
- Altium Designer
Weakness classification (CWE)
References
- 4760f414-e1ae-4ff1-bdad-c7a9c3538b79 (Vendor Advisory)
Frequently asked questions
- What is CVE-2025-27377?
- CVE-2025-27377 is a medium-severity vulnerability in Altium Designer, classified under Improper Certificate Validation. CVSS score: 5.3/10. Published 2026-01-22.
- How severe is CVE-2025-27377?
- Medium severity. CVSS v3 base score is 5.3 out of 10.