CVE-2025-27377CWE-295

Missing Validation of Self-Signed Certificates in Altium Designer Allows Man-in-the-Middle Attacks

Medium · published January 22, 2026

CVSS v3.1
5.3
EPSS
0%
Percentile
8.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00190 · 8.2th percentile
Weakness
CWE-295 · Improper Certificate Validation
Published
2026-01-22T00:16Z
EPSS history
Timeline
  • 22 JAN 00:16Z
    Missing Validation of Self-Signed Certificates in Altium Designer Allows Man-in-the-Middle Attacks
    cvelistv5