CVE-2025-27458

CVE-2025-27458

Published Jul 3, 2025 CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
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.

Remediation

Vendor Workaround

Please make sure that you apply general security practices when operating the MEAC300-FNADE4. The following General Security Practices could mitigate the associated security risk.

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2025-19870 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.
History
Type Values Removed Values Added
First Time appeared Endress
Endress meac300-fnade4
Endress meac300-fnade4 Firmware
CPEs cpe:2.3:h:endress:meac300-fnade4:-:*:*:*:*:*:*:*
cpe:2.3:o:endress:meac300-fnade4_firmware:*:*:*:*:*:*:*:*
Vendors & Products Endress
Endress meac300-fnade4
Endress meac300-fnade4 Firmware
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title CVE-2025-27458
Weaknesses CWE-327
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
SICK AG
Published
Updated
Jul 3, 2025, 1:15 PM
Reserved
Feb 26, 2025, 8:40 AM
Status
Analyzed
Published
Jul 3, 2025, 12:15 PM
Modified
Jun 17, 2026, 9:03 AM