CVE-2025-27458

Summary

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.

Affected Software

VendorProductVersion RangeStatus
Endress+HauserEndress+Hauser MEAC300-FNADE4vers:all/*affected

Weaknesses

  • CWE-327: CWE-327 Use of a Broken or Risky Cryptographic Algorithm

Workarounds

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.

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References