What is CVE-2025-10639?

CVE-2025-10639 is a high-severity vulnerability in Efficientlab Workexaminer Professional, classified under Use of Hard-coded Credentials. CVSS score: 8.8/10. Published 2025-10-21.

How severe is CVE-2025-10639?

High severity. CVSS v3 base score is 8.8 out of 10.

Vulnerability in Efficientlab Workexaminer Professional

CVE-2025-10639

The WorkExaminer Professional server installation comes with an FTP server that is used to receive the client logs on TCP port 12304. An attacker with network access to this port can use weak hardcoded credentials to login to the FTP server and modify or read data, log files and gain remote code execution as NT Authority\SYSTEM on the server by exchanging accessible service binaries in the WorkExaminer installation directory (e.g. "C:\Program File (x86)\Work Examiner Professional Server").

Published 2025-10-21 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.009 (59.2th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 59th percentile — 59.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: +0.000

Affected products

Efficientlab Workexaminer Professional — versions <= 4.0.0.52001

Weakness classification (CWE)

CWE-798 — Use of Hard-coded Credentials

References

551230f0-3615-47bd-b7cc-93e92e730bbf (third-party-advisory)
af854a3a-2127-422b-91ae-364da2661108

Frequently asked questions

What is CVE-2025-10639?: CVE-2025-10639 is a high-severity vulnerability in Efficientlab Workexaminer Professional, classified under Use of Hard-coded Credentials. CVSS score: 8.8/10. Published 2025-10-21.
How severe is CVE-2025-10639?: High severity. CVSS v3 base score is 8.8 out of 10.