# CVE-2020-14404: Memory corruption in n/a

> Out-of-bounds access in LibVNCServer allows attackers to cause memory corruption, potentially leading to code execution or denial of service.

- **Severity:** Medium 5.4 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L`)
- **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:** 17 Jun 2020
- **Updated:** 4 Aug 2024
- **Also known as:** DEBIAN-CVE-2020-14404, GHSA-xrqg-3g47-qq3r, UBUNTU-CVE-2020-14404

## What is CVE-2020-14404?

CVE-2020-14404 is a medium-severity memory corruption vulnerability in Canonical Ubuntu Linux, published on 17 Jun 2020. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

An issue was discovered in LibVNCServer before 0.9.13. libvncserver/rre.c allows out-of-bounds access via encodings.

Weakness: CWE-787 (Out-of-bounds Write)

## Which versions are affected by CVE-2020-14404?

It affects 9 products.


Products: Canonical Ubuntu Linux, Debian Debian Linux, Libvnc Project Libvncserver, Siemens Simatic Itc1500 Firmware, Siemens Simatic Itc1500 Pro Firmware, Siemens Simatic Itc1900 Firmware, Siemens Simatic Itc1900 Pro Firmware, Siemens Simatic Itc2200 Firmware, Siemens Simatic Itc2200 Pro Firmware.

## How do I fix CVE-2020-14404?

Upgrade to a fixed version.

## Is CVE-2020-14404 being exploited?

There is no known exploitation of CVE-2020-14404 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-2020-14404 and fix it if it is affected.

What it is: CVE-2020-14404 is a medium-severity memory corruption vulnerability in Canonical Ubuntu Linux, published on 17 Jun 2020. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-14404 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-2020-14404/ (Markdown: https://insights.sbomify.com/CVE-2020-14404/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-14404
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-14404
- OSV: https://osv.dev/vulnerability/CVE-2020-14404

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-14404/
Summaries are generated and may contain mistakes; the official description above is the record.