# CVE-2021-21647: Missing permission check in Jenkins CloudBees CD Plugin allows scheduling builds

> Attackers with read permissions can schedule builds without build permissions due to missing authorization checks in the Jenkins CloudBees CD Plugin.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N`)
- **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:** 21 Apr 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-7rx6-4vwv-432g

## What is CVE-2021-21647?

CVE-2021-21647 is a medium-severity missing authorization vulnerability in Jenkins CloudBees CD Plugin, published on 21 Apr 2021. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Jenkins CloudBees CD Plugin 1.1.21 and earlier does not perform a permission check in an HTTP endpoint, allowing attackers with Item/Read permission to schedule builds of projects without having Item/Build permission.

## Which versions are affected by CVE-2021-21647?

4 open source packages ship an affected version, including org.jenkins-ci.plugins:electricflow. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `org.jenkins-ci.plugins:electricflow` | Maven | All versions | 1.1.18.1 |
| `org.jenkins-ci.plugins:electricflow` | Maven | All versions | 1.1.18.1 |
| `org.jenkins-ci.plugins:electricflow` | Maven | From 1.1.19 | 1.1.22 |
| `org.jenkins-ci.plugins:electricflow` | Maven | From 1.1.19 | 1.1.22 |

Products: Jenkins Cloudbees Cd.

## How do I fix CVE-2021-21647?

Upgrade org.jenkins-ci.plugins:electricflow to a fixed version for your release line: 1.1.18.1 or 1.1.22.

## Is CVE-2021-21647 being exploited?

There is no known exploitation of CVE-2021-21647 in the wild and no public exploit code.

## Other vulnerabilities in Jenkins CloudBees CD Plugin

- [CVE-2023-46654](https://insights.sbomify.com/CVE-2023-46654/): Jenkins CloudBees CD Plugin vulnerable to arbitrary file deletion (high 8.1)
- [CVE-2023-46655](https://insights.sbomify.com/CVE-2023-46655/): Jenkins CloudBees CD Plugin vulnerable to arbitrary file read (medium 6.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-21647 and fix it if it is affected.

What it is: CVE-2021-21647 is a medium-severity missing authorization vulnerability in Jenkins CloudBees CD Plugin, published on 21 Apr 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-21647 in the wild and no public exploit code.

Affected packages and fixed versions:
- org.jenkins-ci.plugins:electricflow (Maven): affected all versions; fixed in 1.1.18.1
- org.jenkins-ci.plugins:electricflow (Maven): affected all versions; fixed in 1.1.18.1
- org.jenkins-ci.plugins:electricflow (Maven): affected from 1.1.19; fixed in 1.1.22
- org.jenkins-ci.plugins:electricflow (Maven): affected from 1.1.19; fixed in 1.1.22

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-2021-21647/ (Markdown: https://insights.sbomify.com/CVE-2021-21647/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-21647
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-21647
- OSV: https://osv.dev/vulnerability/CVE-2021-21647

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-21647/
Summaries are generated and may contain mistakes; the official description above is the record.