CVE-2025-27458: meac300-fnade4 Weak Crypto — Fix

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.

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CVSS v3.1 Score

6.5

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Weakness Type (CWE)

CWE-327 CWE-327

Affected Products

Vendor	Product	Versions
endress	meac300-fnade4_firmware	All
endress	meac300-fnade4	All

References

Advisories & Patches

https://sick.com/psirt https://sick.com/psirt https://www.sick.com/.well-known/csaf/white/2025/sca-2025-0008.json https://www.sick.com/.well-known/csaf/white/2025/sca-2025-0008.pdf

Other References

https://www.cisa.gov/resources-tools/resources/ics-recommended-practices https://www.endress.com https://www.first.org/cvss/calculator/3.1

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2025-27458? +

CVE-2025-27458 has a CVSS v3.1 score of 6.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-27458? +

CVE-2025-27458 affects products from endress, specifically: meac300-fnade4, meac300-fnade4_firmware. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-27458? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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