CVE-2025-27458Network attack vector

VNC password recovery via exposed challenge-response exchange

Published Jul 3, 2025 · Updated Jul 3, 2025

Weak VNC authentication in Endress+Hauser MEAC300-FNADE4 all versions allows remote attackers to recover the VNC password. The VNC server exposes an unencrypted challenge and encrypted response produced with the shared password, enabling offline password derivation. An attacker must capture a client authentication exchange; successful recovery grants the access available to that VNC account.

CVSS severity6.5
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Weak VNC authentication in Endress+Hauser MEAC300-FNADE4 all versions allows remote attackers to recover the VNC password. The VNC server exposes an unencrypted challenge and encrypted response produced with the shared password, enabling offline password derivation. An attacker must capture a client authentication exchange; successful recovery grants the access available to that VNC account.

The record

CVE
CVE-2025-27458
Published
Jul 3, 2025
Updated
Jul 3, 2025
Vendor
Endress+Hauser
Product
MEAC300
Classifications
CWE-327, T1040
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 3, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 3, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=vers:all/*

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Endress+Hauser · MEAC300version=vers:all/*

Published CVSS scores

6.5SICK AGCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-327Use of a Broken or Risky Cryptographic Algorithm
T1040Network Sniffing

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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