# CVE-2021-1557: Cisco DNA Spaces Connector Privilege Escalation Vulnerabilities

> An authenticated local attacker can exploit insufficient CLI restrictions to elevate privileges to root and execute arbitrary commands on the underlying OS.

- **Severity:** Medium 6.0 (`CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 22 May 2021
- **Updated:** 8 Nov 2024
- **Also known as:** GHSA-235w-frww-c569

## What is CVE-2021-1557?

CVE-2021-1557 is a medium-severity command injection vulnerability in Cisco DNA Spaces Connector, published on 22 May 2021. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Multiple vulnerabilities in Cisco DNA Spaces Connector could allow an authenticated, local attacker to elevate privileges and execute arbitrary commands on the underlying operating system as root. These vulnerabilities are due to insufficient restrictions during the execution of affected CLI commands. An attacker could exploit these vulnerabilities by leveraging the insufficient restrictions during execution of these commands. A successful exploit could allow the attacker to elevate privileges from dnasadmin and execute arbitrary commands on the underlying operating system as root.

Weakness: CWE-78 (Improper Neutralization of Special Elements used in an OS Command)

## Which versions are affected by CVE-2021-1557?

It affects 1 product.


Products: Cisco Dna Spaces\.

## How do I fix CVE-2021-1557?

No fix has been published for CVE-2021-1557 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-1557 being exploited?

There is no known exploitation of CVE-2021-1557 in the wild and no public exploit code.

## Other vulnerabilities in Cisco DNA Spaces Connector

- [CVE-2020-3586](https://insights.sbomify.com/CVE-2020-3586/): Cisco DNA Spaces Connector Command Injection Vulnerability (critical 9.4)
- [CVE-2019-15996](https://insights.sbomify.com/CVE-2019-15996/): Cisco DNA Spaces: Connector Privilege Escalation Vulnerability (medium 6.7)
- [CVE-2019-15997](https://insights.sbomify.com/CVE-2019-15997/): Cisco DNA Spaces: Connector Command Injection Vulnerability (medium 6.7)
- [CVE-2021-1559](https://insights.sbomify.com/CVE-2021-1559/): Cisco DNA Spaces Connector Command Injection Vulnerabilities (medium 6.5)
- [CVE-2021-1560](https://insights.sbomify.com/CVE-2021-1560/): Cisco DNA Spaces Connector Command Injection Vulnerabilities (medium 6.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-1557 and fix it if it is affected.

What it is: CVE-2021-1557 is a medium-severity command injection vulnerability in Cisco DNA Spaces Connector, published on 22 May 2021. 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-2021-1557 in the wild and no public exploit code.

Affected product: Cisco DNA Spaces Connector. 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-2021-1557/ (Markdown: https://insights.sbomify.com/CVE-2021-1557/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-1557
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-1557
- OSV: https://osv.dev/vulnerability/CVE-2021-1557

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-1557/
Summaries are generated and may contain mistakes; the official description above is the record.