# CVE-2017-13992: Weak cryptography in LOYTEC LVIS-3ME

> Insufficient entropy in authentication allows remote code execution on LOYTEC LVIS-3ME devices.

- **Severity:** High 8.1 (`CVSS:3.0/AV:N/AC:H/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:** 5 Oct 2017
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-5vfx-vpj9-7jvr

## What is CVE-2017-13992?

CVE-2017-13992 is a high-severity vulnerability in LOYTEC LVIS-3ME, published on 5 Oct 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An Insufficient Entropy issue was discovered in LOYTEC LVIS-3ME versions prior to 6.2.0. The application does not utilize sufficiently random number generation for the web interface authentication mechanism, which could allow remote code execution.

Weakness: CWE-331 (Insufficient Entropy)

## Which versions are affected by CVE-2017-13992?

It affects 1 product.


Products: Loytec Lvis-3me Firmware.

## How do I fix CVE-2017-13992?

No fix has been published for CVE-2017-13992 yet. Limit exposure of the affected software until one is available.

## Is CVE-2017-13992 being exploited?

There is no known exploitation of CVE-2017-13992 in the wild and no public exploit code.

## Other vulnerabilities in LOYTEC LVIS-3ME

- [CVE-2017-13996](https://insights.sbomify.com/CVE-2017-13996/): Path traversal in LOYTEC LVIS-3ME (high 8.8)
- [CVE-2017-13998](https://insights.sbomify.com/CVE-2017-13998/): Information disclosure in LOYTEC LVIS-3ME (high 7.5)
- [CVE-2017-13994](https://insights.sbomify.com/CVE-2017-13994/): Cross-site scripting in LOYTEC LVIS-3ME (medium 6.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2017-13992 and fix it if it is affected.

What it is: CVE-2017-13992 is a high-severity vulnerability in LOYTEC LVIS-3ME, published on 5 Oct 2017. 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-2017-13992 in the wild and no public exploit code.

Affected product: LOYTEC LVIS-3ME. 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-2017-13992/ (Markdown: https://insights.sbomify.com/CVE-2017-13992/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2017-13992
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2017-13992
- OSV: https://osv.dev/vulnerability/CVE-2017-13992

---
From sbomify Insights: https://insights.sbomify.com/CVE-2017-13992/
Summaries are generated and may contain mistakes; the official description above is the record.