# CVE-2020-29450: Affected versions of Atlassian Confluence Server and Data Center allow remote attackers to impact the application's availability via a Denia


- **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
- **Fix available:** No
- **Published:** 19 Jan 2021
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-5m64-chxv-wxq3

## What is CVE-2020-29450?

CVE-2020-29450 is a medium-severity vulnerability in Atlassian Confluence Server, published on 19 Jan 2021. 

### Official description

Affected versions of Atlassian Confluence Server and Data Center allow remote attackers to impact the application's availability via a Denial of Service (DoS) vulnerability in the avatar upload feature. The affected versions are before version 7.2.0.

Weakness: CWE-434 (Unrestricted Upload of File with Dangerous Type)

## Which versions are affected by CVE-2020-29450?

It affects 2 products.


Products: Atlassian Confluence Data Center, Atlassian Confluence Server.

## How do I fix CVE-2020-29450?

No fix has been published for CVE-2020-29450 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-29450 being exploited?

There is no known exploitation of CVE-2020-29450 in the wild and no public exploit code.

## Other vulnerabilities in Atlassian Confluence Server

- [CVE-2023-22527](https://insights.sbomify.com/CVE-2023-22527/): Atlassian Confluence Data Center and Server Template Injection (critical 10.0, exploited in the wild)
- [CVE-2023-22518](https://insights.sbomify.com/CVE-2023-22518/): Atlassian Confluence Data Center and Server Improper Authorization (critical 10.0, exploited in the wild)
- [CVE-2023-22515](https://insights.sbomify.com/CVE-2023-22515/): Atlassian Confluence Data Center and Server Broken Access Control (critical 10.0, exploited in the wild)
- [CVE-2022-26134](https://insights.sbomify.com/CVE-2022-26134/): Atlassian Confluence Server and Data Center Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2021-26084](https://insights.sbomify.com/CVE-2021-26084/): Atlassian Confluence Server and Data Center Object-Graph Navigation Language (OGNL) Injection (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-29450 and fix it if it is affected.

What it is: CVE-2020-29450 is a medium-severity vulnerability in Atlassian Confluence Server, published on 19 Jan 2021. 
Exploitation: There is no known exploitation of CVE-2020-29450 in the wild and no public exploit code.

Affected product: Atlassian Confluence Server. 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-2020-29450/ (Markdown: https://insights.sbomify.com/CVE-2020-29450/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-29450
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-29450
- OSV: https://osv.dev/vulnerability/CVE-2020-29450

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-29450/
Summaries are generated and may contain mistakes; the official description above is the record.