# CVE-2026-20199: Command injection in Cisco ThousandEyes Enterprise Agent

> Authenticated attackers with admin credentials can execute arbitrary commands as root via crafted SSL certificate uploads in Cisco ThousandEyes Virtual Appliance.

- **Severity:** Medium 4.7 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 20 May 2026
- **Updated:** 21 May 2026
- **Also known as:** GHSA-j82m-6356-v5pg

## What is CVE-2026-20199?

CVE-2026-20199 is a medium-severity command injection vulnerability in Cisco ThousandEyes Enterprise Agent, published on 20 May 2026. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

A vulnerability in the SSL certificate handling of Cisco ThousandEyes Virtual Appliance could allow an authenticated, remote attacker to execute commands on the underlying operating system as the root user.

 This vulnerability is due to insufficient validation of user-supplied input. An authenticated attacker could exploit this vulnerability by uploading a crafted certificate to an affected device. A successful exploit could allow the attacker to execute arbitrary code as the root user on the underlying operating system. To exploit this vulnerability, the attacker must have valid administrative credentials.

Weakness: CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component)

## Which versions are affected by CVE-2026-20199?

It affects 1 product.


Products: Cisco Thousandeyes Virtual Appliance.

## How do I fix CVE-2026-20199?

No fix has been published for CVE-2026-20199 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-20199 being exploited?

There is no known exploitation of CVE-2026-20199 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-20199 and fix it if it is affected.

What it is: CVE-2026-20199 is a medium-severity command injection vulnerability in Cisco ThousandEyes Enterprise Agent, published on 20 May 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-20199 in the wild and no public exploit code.

Affected product: Cisco ThousandEyes Enterprise Agent. 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-2026-20199/ (Markdown: https://insights.sbomify.com/CVE-2026-20199/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-20199
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-20199
- OSV: https://osv.dev/vulnerability/CVE-2026-20199

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-20199/
Summaries are generated and may contain mistakes; the official description above is the record.