# CVE-2020-6933: Denial of service in BlackBerry UEM

> An attacker can cause a Denial of Service in the BlackBerry UEM Core service due to improper input validation.

- **Severity:** Medium 5.5 (`CVSS:3.1/AV:L/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:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 14 Oct 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-v6hh-vv2p-58p6

## What is CVE-2020-6933?

CVE-2020-6933 is a medium-severity denial of service vulnerability in BlackBerry UEM, published on 14 Oct 2020. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

An improper input validation vulnerability in the UEM Core of BlackBerry UEM version(s) 12.13.0, 12.12.1a QF2 (and earlier), and 12.11.1 QF3 (and earlier) could allow an attacker to potentially cause a Denial of Service (DoS) of the UEM Core service.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2020-6933?

It affects 1 product.


Products: Blackberry Unified Endpoint Manager.

## How do I fix CVE-2020-6933?

No fix has been published for CVE-2020-6933 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-6933 being exploited?

There is no known exploitation of CVE-2020-6933 in the wild and no public exploit code.

## Other vulnerabilities in BlackBerry UEM

- [CVE-2026-18084](https://insights.sbomify.com/CVE-2026-18084/): Cross-Site Scripting (XSS) in Management Console of BlackBerry UEM (high 8.6)
- [CVE-2018-8890](https://insights.sbomify.com/CVE-2018-8890/): Information disclosure in UEM (high 7.5)
- [CVE-2018-8892](https://insights.sbomify.com/CVE-2018-8892/): Cross-site request forgery in BlackBerry UEM (medium 6.5)
- [CVE-2017-17442](https://insights.sbomify.com/CVE-2017-17442/): Cross-site scripting in UEM Management Console (medium 6.1)
- [CVE-2026-18085](https://insights.sbomify.com/CVE-2026-18085/): Improper Input Validation Leads to Arbitrary File Download and Potential Denial of Service in BlackBerry UEM (medium 5.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-6933 and fix it if it is affected.

What it is: CVE-2020-6933 is a medium-severity denial of service vulnerability in BlackBerry UEM, published on 14 Oct 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-2020-6933 in the wild and no public exploit code.

Affected product: BlackBerry UEM. 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-2020-6933/ (Markdown: https://insights.sbomify.com/CVE-2020-6933/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-6933
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-6933
- OSV: https://osv.dev/vulnerability/CVE-2020-6933

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-6933/
Summaries are generated and may contain mistakes; the official description above is the record.