CVE-2025-27377 Missing Validation of Self-Signed Certificates in Altium Designer Allows Man-in-the-Middle Attacks
Attackers can intercept traffic and steal credentials or design data due to missing certificate validation in Altium Designer cloud connections.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2025-27377?
CVE-2025-27377 is a medium-severity vulnerability in Altium Designer, published on 22 Jan 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-295
Which versions are affected by CVE-2025-27377?
It affects 1 product.
Products include Altium Designer.
How do I fix CVE-2025-27377?
No fix has been published for CVE-2025-27377 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-27377 being exploited?
There is no known exploitation of CVE-2025-27377 in the wild and no public exploit code.
Sources
Also known as GHSA-xfvg-p8x9-f25q.