# CVE-2025-20259: Cisco ThousandEyes Endpoint Agent for Windows Arbitrary File Write Vulnerability

> A local authenticated attacker can delete arbitrary files via symbolic link manipulation during agent upgrades, requiring a patch.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 4 Jun 2025
- **Updated:** 4 Jun 2025
- **Also known as:** GHSA-cxp3-3gvr-5g69

## What is CVE-2025-20259?

CVE-2025-20259 is a medium-severity path traversal vulnerability in Cisco ThousandEyes Endpoint Agent, published on 4 Jun 2025. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Multiple vulnerabilities in the update process of Cisco ThousandEyes Endpoint Agent for Windows could allow an authenticated, local attacker to delete arbitrary files on an affected device.

These vulnerabilities are due to improper access controls on files that are in the local file system. An attacker could exploit these vulnerabilities by using a symbolic link to perform an agent upgrade that redirects the delete operation of any protected file. A successful exploit could allow the attacker to delete arbitrary files from the file system of the affected device.

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2025-20259?

It affects 1 product.


Products: Cisco Thousandeyes Endpoint Agent.

## How do I fix CVE-2025-20259?

No fix has been published for CVE-2025-20259 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-20259 being exploited?

There is no known exploitation of CVE-2025-20259 in the wild and no public exploit code.

## Other vulnerabilities in Cisco ThousandEyes Endpoint Agent

- [CVE-2025-20126](https://insights.sbomify.com/CVE-2025-20126/): Cisco ThousandEyes Endpoint Agent Certificate Validation Vulnerability (medium 4.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-20259 and fix it if it is affected.

What it is: CVE-2025-20259 is a medium-severity path traversal vulnerability in Cisco ThousandEyes Endpoint Agent, published on 4 Jun 2025. 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-2025-20259 in the wild and no public exploit code.

Affected product: Cisco ThousandEyes Endpoint 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-2025-20259/ (Markdown: https://insights.sbomify.com/CVE-2025-20259/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-20259
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-20259
- OSV: https://osv.dev/vulnerability/CVE-2025-20259

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-20259/
Summaries are generated and may contain mistakes; the official description above is the record.