# CVE-2021-22100: Denial of service in Cloud Controller (CAPI) by cloud foundry

> Attackers can cause Cloud Foundry CAPI instances to timeout and fail by pushing malicious service brokers, preventing app management.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/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:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 25 Mar 2022
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-hpw7-xrjw-4cx3

## What is CVE-2021-22100?

CVE-2021-22100 is a medium-severity denial of service vulnerability in Cloud Controller (CAPI) by cloud foundry, published on 25 Mar 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

In cloud foundry CAPI versions prior to 1.122, a denial-of-service attack in which a developer can push a service broker that (accidentally or maliciously) causes CC instances to timeout and fail is possible. An attacker can leverage this vulnerability to cause an inability for anyone to push or manage apps.

Weakness: CWE-400 (Uncontrolled Resource Consumption)

## Which versions are affected by CVE-2021-22100?

It affects 2 products.


Products: Cloudfoundry Capi-Release, Cloudfoundry Cf-Deployment.

## How do I fix CVE-2021-22100?

No fix has been published for CVE-2021-22100 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-22100 being exploited?

There is no known exploitation of CVE-2021-22100 in the wild and no public exploit code.

## Other vulnerabilities in Cloud Controller (CAPI) by cloud foundry

- [CVE-2018-1195](https://insights.sbomify.com/CVE-2018-1195/): Auth bypass in Cloud Controller (high 8.8)
- [CVE-2020-5417](https://insights.sbomify.com/CVE-2020-5417/): Cloud Controller may allow developers to claim sensitive routes (high 8.5)
- [CVE-2023-20881](https://insights.sbomify.com/CVE-2023-20881/): Missing authorization in Cloud Controller API (high 8.1)
- [CVE-2018-1266](https://insights.sbomify.com/CVE-2018-1266/): Path traversal in n/a (high 8.1)
- [CVE-2020-5400](https://insights.sbomify.com/CVE-2020-5400/): Cloud Controller logs environment variables from app manifests (high 8.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-22100 and fix it if it is affected.

What it is: CVE-2021-22100 is a medium-severity denial of service vulnerability in Cloud Controller (CAPI) by cloud foundry, published on 25 Mar 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-22100 in the wild and no public exploit code.

Affected product: Cloud Controller (CAPI) by cloud foundry. 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-2021-22100/ (Markdown: https://insights.sbomify.com/CVE-2021-22100/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-22100
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-22100
- OSV: https://osv.dev/vulnerability/CVE-2021-22100

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-22100/
Summaries are generated and may contain mistakes; the official description above is the record.