# CVE-2020-10921: Missing authorization in HMI EA9

> Remote attackers can issue commands to physical equipment via unauthenticated HTTP requests on C-MORE HMI panels.

- **Severity:** Critical 9.8 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 23 Jul 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-g78v-7xhx-6j98

## What is CVE-2020-10921?

CVE-2020-10921 is a critical missing authorization vulnerability in C-MORE HMI EA9, published on 23 Jul 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

This vulnerability allows remote attackers to issue commands 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 EA-HTTP.exe process. The issue results from the lack of authentication prior to allowing alterations to the system configuration. An attacker can leverage this vulnerability to issue commands to the physical equipment controlled by the device. Was ZDI-CAN-10482.

Weakness: CWE-306 (Missing Authentication for Critical Functionality)

## Which versions are affected by CVE-2020-10921?

It affects 1 product.


Products: Automationdirect C-More Hmi Ea9 Firmware.

## How do I fix CVE-2020-10921?

No fix has been published for CVE-2020-10921 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-10921 being exploited?

There is no known exploitation of CVE-2020-10921 in the wild and no public exploit code.

## Other vulnerabilities in C-MORE HMI EA9

- [CVE-2020-10920](https://insights.sbomify.com/CVE-2020-10920/): Missing authorization in HMI EA9 (critical 9.8)
- [CVE-2020-10918](https://insights.sbomify.com/CVE-2020-10918/): Auth bypass in HMI EA9 (high 7.5)
- [CVE-2020-10922](https://insights.sbomify.com/CVE-2020-10922/): Denial of service in HMI EA9 (high 7.5)
- [CVE-2020-10919](https://insights.sbomify.com/CVE-2020-10919/): Weak cryptography in HMI EA9 (medium 5.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-10921 and fix it if it is affected.

What it is: CVE-2020-10921 is a critical missing authorization vulnerability in C-MORE HMI EA9, published on 23 Jul 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-10921 in the wild and no public exploit code.

Affected product: C-MORE HMI EA9. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2020-10921/ (Markdown: https://insights.sbomify.com/CVE-2020-10921/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-10921
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-10921
- OSV: https://osv.dev/vulnerability/CVE-2020-10921

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From sbomify Insights: https://insights.sbomify.com/CVE-2020-10921/
Summaries are generated and may contain mistakes; the official description above is the record.