# CVE-2021-20107: Missing authorization in SLOAN

> Unauthenticated attackers can use Bluetooth Low Energy to read maintenance data and modify water flow or sensor settings on Sloan smart faucets.

- **Severity:** Medium 5.4 (`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 30 Jun 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-6fjv-rgvm-7x24

## What is CVE-2021-20107?

CVE-2021-20107 is a medium-severity missing authorization vulnerability in SLOAN, published on 30 Jun 2021. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

There exists an unauthenticated BLE Interface in Sloan SmartFaucets including Optima EAF, Optima ETF/EBF, BASYS EFX, and Flushometers including SOLIS. The vulnerability allows for unauthenticated kinetic effects and information disclosure on the faucets. It is possible to use the Bluetooth Low Energy (BLE) connectivity to read and write to many BLE characteristics on the device. Some of these control the flow of water, the sensitivity of the sensors, and information about maintenance.

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

## Which versions are affected by CVE-2021-20107?

It affects 71 products.


Products: Sloan Basys Efx-100 Firmware, Sloan Basys Efx-150 Firmware, Sloan Basys Efx-175 Firmware, Sloan Basys Efx-177 Firmware, Sloan Basys Efx-180 Firmware, Sloan Basys Efx-200 Firmware, Sloan Basys Efx-250 Firmware, Sloan Basys Efx-275 Firmware, Sloan Basys Efx-277 Firmware, Sloan Basys Efx-280 Firmware, Sloan Basys Efx-300 Firmware, Sloan Basys Efx-350 Firmware, Sloan Basys Efx-375 Firmware, Sloan Basys Efx-377 Firmware, Sloan Basys Efx-380 Firmware, Sloan Basys Efx-600 Firmware, Sloan Basys Efx-650 Firmware, Sloan Basys Efx-675 Firmware, Sloan Basys Efx-677 Firmware, Sloan Basys Efx-680 Firmware and 51 more.

## How do I fix CVE-2021-20107?

No fix has been published for CVE-2021-20107 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-20107 being exploited?

There is no known exploitation of CVE-2021-20107 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-20107 and fix it if it is affected.

What it is: CVE-2021-20107 is a medium-severity missing authorization vulnerability in SLOAN, published on 30 Jun 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-20107 in the wild and no public exploit code.

Affected product: SLOAN. 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-2021-20107/ (Markdown: https://insights.sbomify.com/CVE-2021-20107/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-20107
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-20107
- OSV: https://osv.dev/vulnerability/CVE-2021-20107

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-20107/
Summaries are generated and may contain mistakes; the official description above is the record.