# CVE-2020-14383: Denial of service in samba

> An authenticated user can repeatedly crash the Samba RPC server, disrupting multiple RPC services while the DNS server remains operational.

- **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:** 2 Dec 2020
- **Updated:** 15 Aug 2024
- **Also known as:** ALPINE-CVE-2020-14383, AZL-36990, AZL-7349, DEBIAN-CVE-2020-14383, ECHO-9156-ce37-b9e6, GHSA-9hpm-fmxg-j5xc, UBUNTU-CVE-2020-14383

## What is CVE-2020-14383?

CVE-2020-14383 is a medium-severity denial of service vulnerability in Redhat Enterprise Linux, published on 2 Dec 2020. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A flaw was found in samba's DNS server. An authenticated user could use this flaw to the RPC server to crash. This RPC server, which also serves protocols other than dnsserver, will be restarted after a short delay, but it is easy for an authenticated non administrative attacker to crash it again as soon as it returns. The Samba DNS server itself will continue to operate, but many RPC services will not.

Weakness: CWE-391 (DEPRECATED: Unchecked Error Condition)

## Which versions are affected by CVE-2020-14383?

It affects 2 products.


Products: Redhat Enterprise Linux, Samba Samba.

## How do I fix CVE-2020-14383?

Apply the vendor's patch.

## Is CVE-2020-14383 being exploited?

There is no known exploitation of CVE-2020-14383 in the wild and no public exploit code.

## Other vulnerabilities in Redhat Enterprise Linux

- [CVE-2018-14667](https://insights.sbomify.com/CVE-2018-14667/): Red Hat JBoss RichFaces Framework Expression Language Injection (critical 9.8, exploited in the wild)
- [CVE-2021-20325](https://insights.sbomify.com/CVE-2021-20325/): Missing fixes for CVE-2021-40438 and CVE-2021-26691 in the versions of httpd, as shipped in Red Hat Enterprise Linux 8.5.0, causes a securit (critical 9.8)
- [CVE-2018-25011](https://insights.sbomify.com/CVE-2018-25011/): Memory corruption in libwebp (critical 9.8)
- [CVE-2018-25014](https://insights.sbomify.com/CVE-2018-25014/): Other in libwebp (critical 9.8)
- [CVE-2014-3585](https://insights.sbomify.com/CVE-2014-3585/): Supply chain in redhat-upgrade-tool (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-14383 and fix it if it is affected.

What it is: CVE-2020-14383 is a medium-severity denial of service vulnerability in Redhat Enterprise Linux, published on 2 Dec 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-2020-14383 in the wild and no public exploit code.

Affected product: Redhat Enterprise 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-2020-14383/ (Markdown: https://insights.sbomify.com/CVE-2020-14383/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-14383
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-14383
- OSV: https://osv.dev/vulnerability/CVE-2020-14383

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-14383/
Summaries are generated and may contain mistakes; the official description above is the record.