Vulnerability Description
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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Endress | Meac300-Fnade4 Firmware | All versions |
| Endress | Meac300-Fnade4 | - |
Related Weaknesses (CWE)
References
- 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
FAQ
What is CVE-2025-27458?
CVE-2025-27458 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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 encrypt...
How severe is CVE-2025-27458?
CVE-2025-27458 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-27458?
Check the references section above for vendor advisories and patch information. Affected products include: Endress Meac300-Fnade4 Firmware, Endress Meac300-Fnade4.