# CVE-2020-14312: Misconfiguration in dnsmasq

> Default dnsmasq configuration allows remote attackers to use it as an open resolver for DDoS attacks against other systems.

- **Severity:** Medium 5.9 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/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:** Not needed
- **Fix available:** Yes
- **Published:** 5 Feb 2021
- **Updated:** 4 Aug 2024
- **Also known as:** DEBIAN-CVE-2020-14312, GHSA-xr95-5hhj-crp6, MGASA-2020-0310, OESA-2022-1821, UBUNTU-CVE-2020-14312, openSUSE-SU-2024:11653-1

## What is CVE-2020-14312?

CVE-2020-14312 is a medium-severity vulnerability in Fedoraproject Fedora, published on 5 Feb 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A flaw was found in the default configuration of dnsmasq, as shipped with Fedora versions prior to 31 and in all versions Red Hat Enterprise Linux, where it listens on any interface and accepts queries from addresses outside of its local subnet. In particular, the option `local-service` is not enabled. Running dnsmasq in this manner may inadvertently make it an open resolver accessible from any address on the internet. This flaw allows an attacker to conduct a Distributed Denial of Service (DDoS) against other systems.

Weakness: CWE-284 (Improper Access Control)

## Which versions are affected by CVE-2020-14312?

It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `dnsmasq` | openSUSE:Tumbleweed | All versions | 2.86-3.1 |

Products: Fedoraproject Fedora.

## How do I fix CVE-2020-14312?

Change a configuration setting.

## Is CVE-2020-14312 being exploited?

There is no known exploitation of CVE-2020-14312 in the wild and no public exploit code.

## Other vulnerabilities in Fedoraproject Fedora

- [CVE-2024-4577](https://insights.sbomify.com/CVE-2024-4577/): PHP-CGI OS Command Injection (critical 9.8, exploited in the wild)
- [CVE-2021-39226](https://insights.sbomify.com/CVE-2021-39226/): Grafana Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2019-5544](https://insights.sbomify.com/CVE-2019-5544/): VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow (critical 9.8, exploited in the wild)
- [CVE-2024-4947](https://insights.sbomify.com/CVE-2024-4947/): Google Chromium V8 Type Confusion (critical 9.6, exploited in the wild)
- [CVE-2024-4671](https://insights.sbomify.com/CVE-2024-4671/): Google Chromium Visuals Use-After-Free (critical 9.6, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-14312 and fix it if it is affected.

What it is: CVE-2020-14312 is a medium-severity vulnerability in Fedoraproject Fedora, published on 5 Feb 2021. 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-2020-14312 in the wild and no public exploit code.

Affected product: Fedoraproject Fedora. 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-2020-14312/ (Markdown: https://insights.sbomify.com/CVE-2020-14312/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-14312
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-14312
- OSV: https://osv.dev/vulnerability/CVE-2020-14312

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-14312/
Summaries are generated and may contain mistakes; the official description above is the record.