# CVE-2020-14483: Denial of service in Niagara

> A timeout during TLS handshake causes Niagara threads to hang, requiring manual restarts and causing denial of service in building automation systems.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 13 Aug 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-f98h-fhjw-57pm

## What is CVE-2020-14483?

CVE-2020-14483 is a medium-severity denial of service vulnerability in Niagara, published on 13 Aug 2020. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A timeout during a TLS handshake can result in the connection failing to terminate. This can result in a Niagara thread hanging and requires a manual restart of Niagara (Versions 4.6.96.28, 4.7.109.20, 4.7.110.32, 4.8.0.110) and Niagara Enterprise Security (Versions 2.4.31, 2.4.45, 4.8.0.35) to correct.

Weakness: CWE-1088 (Synchronous Access of Remote Resource without Timeout)

## Which versions are affected by CVE-2020-14483?

It affects 2 products.


Products: Tridium Niagara, Tridium Niagara Enterprise Security.

## How do I fix CVE-2020-14483?

No fix has been published for CVE-2020-14483 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-14483 being exploited?

There is no known exploitation of CVE-2020-14483 in the wild and no public exploit code.

## Other vulnerabilities in Niagara

- [CVE-2017-16748](https://insights.sbomify.com/CVE-2017-16748/): An attacker can log into the local Niagara platform (Niagara AX Framework Versions 3.8 and prior or Niagara 4 Framework Versions 4.4 and pri (critical 9.8)
- [CVE-2025-3937](https://insights.sbomify.com/CVE-2025-3937/): Use of Password Hash with Insufficient Computational Effort (high 7.7)
- [CVE-2025-3944](https://insights.sbomify.com/CVE-2025-3944/): Incorrect Permission Assignment for Critical Resource (high 7.2)
- [CVE-2025-3945](https://insights.sbomify.com/CVE-2025-3945/): Improper Neutralization of Argument Delimiters in a Command (‘Argument Injection’) (high 7.2)
- [CVE-2017-16744](https://insights.sbomify.com/CVE-2017-16744/): Path traversal in Niagara AX Framework and Niagara 4 Framework (high 7.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-14483 and fix it if it is affected.

What it is: CVE-2020-14483 is a medium-severity denial of service vulnerability in Niagara, published on 13 Aug 2020. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-14483 in the wild and no public exploit code.

Affected product: Niagara. 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-2020-14483/ (Markdown: https://insights.sbomify.com/CVE-2020-14483/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-14483
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-14483
- OSV: https://osv.dev/vulnerability/CVE-2020-14483

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-14483/
Summaries are generated and may contain mistakes; the official description above is the record.