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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| SICK AGCNA (assigner) | 3.1 | Medium6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N |
| NVDNVD · Analyzed | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
- EPSS (exploitation in 30 days)
- 0.21% · top 89% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.5.
Weakness
Affected products
Endress+Hauser · Endress+Hauser MEAC300-FNADE4
- affected vers:all/*
What to do
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.
References (6)
- https://www.endress.com (opens in a new tab)x_Endress+Hauser
- https://sick.com/psirt (opens in a new tab)x_SICK PSIRT Security Advisoriesvendor-advisory
- https://www.cisa.gov/resources-tools/resources/ics-recommended-practices (opens in a new tab)x_ICS-CERT recommended practices on Industrial Security
- https://www.first.org/cvss/calculator/3.1 (opens in a new tab)x_CVSS v3.1 Calculator
- https://www.sick.com/.well-known/csaf/white/2025/sca-2025-0008.json (opens in a new tab)x_The canonical URL.
- https://www.sick.com/.well-known/csaf/white/2025/sca-2025-0008.pdf (opens in a new tab)vendor-advisory
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2025-27458)Record last updated .