# CVE-2021-25971: Camaleon CMS - SVG File Upload Creates DoS for Media Upload Feature

> An attacker with low privileges can cause a permanent denial of service in the media upload feature by uploading a specially crafted SVG file.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/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:** 20 Oct 2021
- **Updated:** 30 Apr 2025
- **Also known as:** GHSA-r2w2-h6r8-3r53

## What is CVE-2021-25971?

CVE-2021-25971 is a medium-severity denial of service vulnerability in camaleon_cms, published on 20 Oct 2021. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

In Camaleon CMS, versions 2.0.1 to 2.6.0 are vulnerable to an Uncaught Exception. The app's media upload feature crashes permanently when an attacker with a low privileged access uploads a specially crafted .svg file

Weakness: CWE-755 (Improper Handling of Exceptional Conditions), CWE-248 (Uncaught Exception)

## Which versions are affected by CVE-2021-25971?

2 open source packages ship an affected version, including camaleon_cms. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `camaleon_cms` | RubyGems | From 2.0.1 | 2.6.0.1 |
| `camaleon_cms` | RubyGems | From 2.0.1 | 2.6.0.1 |

Products: Tuzitio Camaleon Cms.

## How do I fix CVE-2021-25971?

Upgrade camaleon_cms to 2.6.0.1 or later.

## Is CVE-2021-25971 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-25971 exists.

## Other vulnerabilities in camaleon_cms

- [CVE-2024-46986](https://insights.sbomify.com/CVE-2024-46986/): Arbitrary file write leading to RCE in Camaleon CMS (critical 10.0)
- [CVE-2023-30145](https://insights.sbomify.com/CVE-2023-30145/): Server-Side Template Injection in Camaleon CMS (critical 9.8)
- [CVE-2021-25970](https://insights.sbomify.com/CVE-2021-25970/): Camaleon CMS - Insufficient Session Expiration after Password Change (high 8.8)
- [CVE-2024-46987](https://insights.sbomify.com/CVE-2024-46987/): Arbitrary path traversal in Camaleon CMS (high 7.7)
- [CVE-2021-25969](https://insights.sbomify.com/CVE-2021-25969/): Camaleon CMS - Stored Cross-Site Scripting (XSS) in Comments (medium 6.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-25971 and fix it if it is affected.

What it is: CVE-2021-25971 is a medium-severity denial of service vulnerability in camaleon_cms, published on 20 Oct 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-25971 exists.

Affected packages and fixed versions:
- camaleon_cms (RubyGems): affected from 2.0.1; fixed in 2.6.0.1
- camaleon_cms (RubyGems): affected from 2.0.1; fixed in 2.6.0.1

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-2021-25971/ (Markdown: https://insights.sbomify.com/CVE-2021-25971/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-25971
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-25971
- OSV: https://osv.dev/vulnerability/CVE-2021-25971

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-25971/
Summaries are generated and may contain mistakes; the official description above is the record.