What is CVE-2020-10920?

CVE-2020-10920 is a critical-severity vulnerability in Automationdirect C-More Hmi Ea9 Firmware, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2020-07-23.

How severe is CVE-2020-10920?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Auth bypass in Automationdirect C-More Hmi Ea9 Firmware

CVE-2020-10920

This vulnerability allows remote attackers to execute arbitrary code on affected installations of C-MORE HMI EA9 Firmware version 6.52 touch screen panels. Authentication is not required to exploit this vulnerability. The specific flaw exists within the control service, which listens on TCP port 9999 by default. The issue results from the lack of authentication prior to allowing alterations to the system configuration. An attacker can leverage this vulnerability to execute code in the context of the device. Was ZDI-CAN-10493.

Vulnerability class: Broken Authentication

Published 2020-07-23 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.049 (92.0th percentile), scored 2026-10-20.

Low probability of exploitation in the next 30 days, but still tracked. 92nd percentile — 92.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.049 · newest: 0.049 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

References

www.zerodayinitiative.com/advisories/ZDI-20-808/ (VDB Entry, Third Party Advisory)

Frequently asked questions

What is CVE-2020-10920?: CVE-2020-10920 is a critical-severity vulnerability in Automationdirect C-More Hmi Ea9 Firmware, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2020-07-23.
How severe is CVE-2020-10920?: Critical severity. CVSS v3 base score is 9.8 out of 10.