CVE-2025-27377

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

MEDIUM
5.3
CVSS Score
Published: January 22, 2026 at 12:16 AM UTC
Updated: June 17, 2026 at 09:03 AM UTC
2 products affected across 1 vendorDesignerAltium Designer

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Severity
MEDIUM5.3
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

24.9.0 ≤ v < 25.2.0
24.9 ≤ v ≤ 25.124.9

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.3MEDIUMAltium
Attack Vector
NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-295

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