# CVE-2019-6109: Other in n/a

> A malicious server can manipulate OpenSSH client output using ANSI codes to hide transferred files, bypassing user visibility.

- **Severity:** Medium 6.8 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N`)
- **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:** Yes
- **Published:** 31 Jan 2019
- **Updated:** 14 Oct 2026
- **Also known as:** ALPINE-CVE-2019-6109, DEBIAN-CVE-2019-6109, GHSA-2pqm-q853-jfvf, UBUNTU-CVE-2019-6109

## What is CVE-2019-6109?

CVE-2019-6109 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 31 Jan 2019. 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

An issue was discovered in OpenSSH 7.9. Due to missing character encoding in the progress display, a malicious server (or Man-in-The-Middle attacker) can employ crafted object names to manipulate the client output, e.g., by using ANSI control codes to hide additional files being transferred. This affects refresh_progress_meter() in progressmeter.c.

Weakness: CWE-116 (Improper Encoding or Escaping of Output)

## Which versions are affected by CVE-2019-6109?

It affects 20 products.


Products: Canonical Ubuntu Linux, Debian Debian Linux, Fedoraproject Fedora, Fujitsu M10-1 Firmware, Fujitsu M10-4 Firmware, Fujitsu M10-4s Firmware, Fujitsu M12-1 Firmware, Fujitsu M12-2 Firmware, Fujitsu M12-2s Firmware, Netapp Element Software, Netapp Ontap Select Deploy, Netapp Storage Automation Store, OpenSSH, Redhat Enterprise Linux, Redhat Enterprise Linux Eus, Redhat Enterprise Linux Server Aus, Redhat Enterprise Linux Server Tus, Siemens Scalance X204rna Eec Firmware, Siemens Scalance X204rna Firmware, Winscp Winscp.

## How do I fix CVE-2019-6109?

Apply the vendor's patch.

## Is CVE-2019-6109 being exploited?

There is no known exploitation of CVE-2019-6109 in the wild and no public exploit code.

## Other vulnerabilities in Canonical Ubuntu Linux

- [CVE-2020-11651](https://insights.sbomify.com/CVE-2020-11651/): SaltStack Salt Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2020-7247](https://insights.sbomify.com/CVE-2020-7247/): OpenSMTPD Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2019-16928](https://insights.sbomify.com/CVE-2019-16928/): Exim Out-of-bounds Write (critical 9.8, exploited in the wild)
- [CVE-2018-6789](https://insights.sbomify.com/CVE-2018-6789/): Exim Buffer Overflow (critical 9.8, exploited in the wild)
- [CVE-2015-2590](https://insights.sbomify.com/CVE-2015-2590/): Oracle Java SE and Java SE Embedded Remote Code Execution (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-6109 and fix it if it is affected.

What it is: CVE-2019-6109 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 31 Jan 2019. 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-2019-6109 in the wild and no public exploit code.

Affected product: Canonical Ubuntu Linux. 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-2019-6109/ (Markdown: https://insights.sbomify.com/CVE-2019-6109/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-6109
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-6109
- OSV: https://osv.dev/vulnerability/CVE-2019-6109

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-6109/
Summaries are generated and may contain mistakes; the official description above is the record.