CVE-2025-27458

The VNC authentication mechanism bases on a challenge-response system where both server and client use the same password for encryption. The challenge is sent from the server to the client, is encrypted by the client and sent back. The server does the same encryption locally and if the responses match it is prooven that the client knows the correct password. Since all VNC communication is unencrypted, an attacker can obtain the challenge and response and try to derive the password from this information.

• CWE-327

• https://sick.com/psirtVendor Advisory
• https://sick.com/psirtVendor Advisory
• https://sick.com/psirtVendor Advisory
• https://sick.com/psirtVendor Advisory
• https://www.cisa.gov/resources-tools/resources/ics-recommended-practicesUS Government Resource
• https://www.endress.comProduct
• https://www.first.org/cvss/calculator/3.1Not Applicable
• https://www.sick.com/.well-known/csaf/white/2025/sca-2025-0008.jsonVendor Advisory
• https://www.sick.com/.well-known/csaf/white/2025/sca-2025-0008.pdfVendor Advisory

Published

Jul 3, 2025

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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