# CVE-2016-6884: Denial of service in n/a

> Remote attackers can cause a denial of service via crafted messages in MatrixSSL TLS implementations using CBC mode.

- **Severity:** Medium 6.5 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 3 Mar 2017
- **Updated:** 6 Aug 2024
- **Also known as:** GHSA-6367-2j27-f6p4

## What is CVE-2016-6884?

CVE-2016-6884 is a medium-severity denial of service vulnerability in n/a, published on 3 Mar 2017. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

TLS cipher suites with CBC mode in TLS 1.1 and 1.2 in MatrixSSL before 3.8.3 allow remote attackers to cause a denial of service (out-of-bounds read) via a crafted message.

Weakness: CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2016-6884?

It affects 1 product.


Products: Matrixssl Matrixssl.

## How do I fix CVE-2016-6884?

No fix has been published for CVE-2016-6884 yet. Limit exposure of the affected software until one is available.

## Is CVE-2016-6884 being exploited?

There is no known exploitation of CVE-2016-6884 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2019-14431](https://insights.sbomify.com/CVE-2019-14431/): Memory corruption in n/a (critical 9.8)
- [CVE-2019-13470](https://insights.sbomify.com/CVE-2019-13470/): Memory corruption in n/a (critical 9.8)
- [CVE-2019-10914](https://insights.sbomify.com/CVE-2019-10914/): Memory corruption in n/a (critical 9.8)
- [CVE-2016-6890](https://insights.sbomify.com/CVE-2016-6890/): Memory corruption in n/a (critical 9.8)
- [CVE-2022-43974](https://insights.sbomify.com/CVE-2022-43974/): Integer overflow in n/a (high 8.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2016-6884 and fix it if it is affected.

What it is: CVE-2016-6884 is a medium-severity denial of service vulnerability in n/a, published on 3 Mar 2017. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2016-6884 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-2016-6884/ (Markdown: https://insights.sbomify.com/CVE-2016-6884/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2016-6884
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2016-6884
- OSV: https://osv.dev/vulnerability/CVE-2016-6884

---
From sbomify Insights: https://insights.sbomify.com/CVE-2016-6884/
Summaries are generated and may contain mistakes; the official description above is the record.