# CVE-2016-6188: Denial of service in n/a

> Remote attackers can cause denial of service via memory consumption by uploading large attachments, affecting SOGo groupware server administrators.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 3 Feb 2017
- **Updated:** 6 Aug 2024
- **Also known as:** DEBIAN-CVE-2016-6188, GHSA-5wc3-v5wf-mg8q, UBUNTU-CVE-2016-6188

## What is CVE-2016-6188?

CVE-2016-6188 is a medium-severity denial of service vulnerability in n/a, published on 3 Feb 2017. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Memory leak in SOGo 2.3.7 allows remote attackers to cause a denial of service (memory consumption) via a large number of attempts to upload a large attachment, related to temporary files.

Weakness: CWE-399

## Which versions are affected by CVE-2016-6188?

It affects 1 product.


Products: Alinto Sogo.

## How do I fix CVE-2016-6188?

Upgrade to a fixed version.

## Is CVE-2016-6188 being exploited?

There is no known exploitation of CVE-2016-6188 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2015-5395](https://insights.sbomify.com/CVE-2015-5395/): Cross-site request forgery in n/a (high 8.8)
- [CVE-2025-71276](https://insights.sbomify.com/CVE-2025-71276/): Cross-site scripting in SOGo (medium 6.4)
- [CVE-2025-63499](https://insights.sbomify.com/CVE-2025-63499/): Cross-site scripting in n/a (medium 6.1)
- [CVE-2025-63498](https://insights.sbomify.com/CVE-2025-63498/): Cross-site scripting in n/a (medium 6.1)
- [CVE-2024-24510](https://insights.sbomify.com/CVE-2024-24510/): Cross Site Scripting vulnerability in Alinto SOGo before 5.10.0 allows a remote attacker to execute arbitrary code via the import function to the mail component. (medium 6.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2016-6188 and fix it if it is affected.

What it is: CVE-2016-6188 is a medium-severity denial of service vulnerability in n/a, published on 3 Feb 2017. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2016-6188 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-2016-6188/ (Markdown: https://insights.sbomify.com/CVE-2016-6188/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2016-6188
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2016-6188
- OSV: https://osv.dev/vulnerability/CVE-2016-6188

---
From sbomify Insights: https://insights.sbomify.com/CVE-2016-6188/
Summaries are generated and may contain mistakes; the official description above is the record.