# CVE-2021-1133: Cisco Data Center Network Manager REST API Vulnerabilities

> Authenticated attackers can view, modify, and delete data in Cisco DCNM due to missing authorization checks in the REST API.

- **Severity:** Medium 4.6 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 20 Jan 2021
- **Updated:** 12 Nov 2024
- **Also known as:** GHSA-r64g-5qwv-v2rf

## What is CVE-2021-1133?

CVE-2021-1133 is a medium-severity missing authorization vulnerability in Cisco Data Center Network Manager, published on 20 Jan 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

Multiple vulnerabilities in the REST API endpoint of Cisco Data Center Network Manager (DCNM) could allow an authenticated, remote attacker to view, modify, and delete data without proper authorization. For more information about these vulnerabilities, see the Details section of this advisory.

Weakness: CWE-184 (Incomplete List of Disallowed Inputs)

## Which versions are affected by CVE-2021-1133?

It affects 1 product.


Products: Cisco Data Center Network Manager.

## How do I fix CVE-2021-1133?

No fix has been published for CVE-2021-1133 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-1133 being exploited?

There is no known exploitation of CVE-2021-1133 in the wild and no public exploit code.

## Other vulnerabilities in Cisco Data Center Network Manager

- [CVE-2020-3382](https://insights.sbomify.com/CVE-2020-3382/): Cisco Data Center Network Manager Authentication Bypass Vulnerability (critical 9.8)
- [CVE-2019-15975](https://insights.sbomify.com/CVE-2019-15975/): Cisco Data Center Network Manager Authentication Bypass Vulnerabilities (critical 9.8)
- [CVE-2019-15976](https://insights.sbomify.com/CVE-2019-15976/): Cisco Data Center Network Manager Authentication Bypass Vulnerabilities (critical 9.8)
- [CVE-2019-15977](https://insights.sbomify.com/CVE-2019-15977/): Cisco Data Center Network Manager Authentication Bypass Vulnerabilities (critical 9.8)
- [CVE-2019-1619](https://insights.sbomify.com/CVE-2019-1619/): Cisco Data Center Network Manager Authentication Bypass Vulnerability (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-1133 and fix it if it is affected.

What it is: CVE-2021-1133 is a medium-severity missing authorization vulnerability in Cisco Data Center Network Manager, published on 20 Jan 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-1133 in the wild and no public exploit code.

Affected product: Cisco Data Center Network Manager. 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-2021-1133/ (Markdown: https://insights.sbomify.com/CVE-2021-1133/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-1133
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-1133
- OSV: https://osv.dev/vulnerability/CVE-2021-1133

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-1133/
Summaries are generated and may contain mistakes; the official description above is the record.