# CVE-2016-6670: Weak cryptography in n/a

> Insufficient entropy in certificate generation allows remote attackers to discover private keys, compromising encrypted communications on Huawei switches.

- **Severity:** Medium 5.3 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 7 Sep 2016
- **Updated:** 6 Aug 2024
- **Also known as:** GHSA-hhfp-v3gq-7x69

## What is CVE-2016-6670?

CVE-2016-6670 is a medium-severity vulnerability in n/a, published on 7 Sep 2016. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Huawei S7700, S9300, S9700, and S12700 devices with software before V200R008C00SPC500 use random numbers with insufficient entropy to generate self-signed certificates, which makes it easier for remote attackers to discover private keys by leveraging knowledge of a certificate.

Weakness: CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor)

## Which versions are affected by CVE-2016-6670?

It affects 4 products.


Products: Huawei S7700 Firmware, Huawei S9300 Firmware, Huawei S9700 Firmware, Huawei Firmware S12700.

## How do I fix CVE-2016-6670?

No fix has been published for CVE-2016-6670 yet. Limit exposure of the affected software until one is available.

## Is CVE-2016-6670 being exploited?

There is no known exploitation of CVE-2016-6670 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2016-6670 and fix it if it is affected.

What it is: CVE-2016-6670 is a medium-severity vulnerability in n/a, published on 7 Sep 2016. 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-2016-6670 in the wild and no public exploit code.

Affected product: n/a. 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-2016-6670/ (Markdown: https://insights.sbomify.com/CVE-2016-6670/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2016-6670
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2016-6670
- OSV: https://osv.dev/vulnerability/CVE-2016-6670

---
From sbomify Insights: https://insights.sbomify.com/CVE-2016-6670/
Summaries are generated and may contain mistakes; the official description above is the record.