CVE-2025-27377
📋 TL;DR
Altium Designer 24.9.0 fails to validate self-signed server certificates for cloud connections, allowing man-in-the-middle attackers to intercept or manipulate network traffic. This could expose authentication credentials and sensitive design data. Users of Altium Designer 24.9.0 with cloud connectivity enabled are affected.
💻 Affected Systems
- Altium Designer
📦 What is this software?
Designer by Altium
⚠️ Risk & Real-World Impact
Worst Case
Attackers intercept authentication credentials and sensitive design files, leading to intellectual property theft, unauthorized system access, and design manipulation.
Likely Case
Credential theft and exposure of design data in transit when users connect to Altium cloud services over untrusted networks.
If Mitigated
Limited impact if connections only occur over trusted internal networks with proper network segmentation and monitoring.
🎯 Exploit Status
Requires MITM position on network path between client and Altium cloud servers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 24.9.1 or later
Vendor Advisory: https://www.altium.com/platform/security-compliance/security-advisories
Restart Required: Yes
Instructions:
1. Open Altium Designer. 2. Navigate to Help > Check for Updates. 3. Install available updates. 4. Restart Altium Designer.
🔧 Temporary Workarounds
Disable Cloud Connections
windowsPrevent Altium Designer from connecting to cloud services
Configure Altium Designer settings to disable all cloud-based features
Network Segmentation
allRestrict Altium Designer network traffic to trusted internal networks only
🧯 If You Can't Patch
- Use Altium Designer only on trusted, segmented networks with no internet access
- Implement network monitoring for suspicious certificate validation failures
🔍 How to Verify
Check if Vulnerable:
Check Altium Designer version in Help > About. If version is 24.9.0, system is vulnerable.Check Version:
In Altium Designer: Help > AboutVerify Fix Applied:
Verify version is 24.9.1 or later in Help > About.📡 Detection & Monitoring
Log Indicators:
- Failed or missing certificate validation events in application logs
- Unusual network connections to Altium cloud endpoints
Network Indicators:
- SSL/TLS traffic to Altium servers without proper certificate validation
- MITM attack patterns on Altium-related network traffic
SIEM Query:
source="altium" AND (event_type="certificate_validation_failure" OR event_type="cloud_connection_error")