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Vulnerabilities

Vulnerability · CVE-2025-27458

The VNC authentication mechanism bases on a challenge-response system where both server and client use the same password for encryption.

Published Jul 3, 2025 · catalog updated Jul 3, 2025 · Endress+Hauser Endress+Hauser MEAC300-FNADE4

Check if you run it

No confirmed exploitation is on record for CVE-2025-27458. EPSS is 0.21%. Act only if a listed version of Endress+Hauser Endress+Hauser MEAC300-FNADE4 is installed.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium6.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.21%
Remediation
Vendor / distro source
Affected products
vendor Endress+Hauser Endress+Hauser MEAC300-FNADE4 vers:all/*

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Endress+Hauser Endress+Hauser MEAC300-FNADE4 vers:all/*vers:all/*

How to fix CVE-2025-27458

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-27458. EPSS is 0.21%. Act only if a listed version of Endress+Hauser Endress+Hauser MEAC300-FNADE4 is installed.

Which versions are affected?

Compare what you have installed with Endress+Hauser Endress+Hauser MEAC300-FNADE4 vers:all/* vers:all/*. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.21%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jul 3, 2025 · EUVD

    Detected

    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 unencryp

  2. Jul 3, 2025 · EUVD

    Updated

    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 unencryp

Sources

  • CVE.orgVulnerability recordCVE-2025-27458

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-27458

    30-day exploitation probability 0.21%

    first.org
  • EUVDVulnerability recordEUVD-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

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 21, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.