# CVE-2025-64990: Command Injection in 1E-Explorer-TachyonCore-LogoffUser Instruction

> Authenticated attackers with Actioner privileges can inject arbitrary commands to execute elevated code on connected devices via the LogoffUser instruction.

- **Severity:** Medium 6.8 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 11 Dec 2025
- **Updated:** 11 Dec 2025
- **Also known as:** GHSA-xmxh-pm35-h64j

## What is CVE-2025-64990?

CVE-2025-64990 is a medium-severity command injection vulnerability in TeamViewer DEX, published on 11 Dec 2025. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

### Official description

A command injection vulnerability was discovered in TeamViewer DEX (former 1E DEX), specifically within the 1E-Explorer-TachyonCore-LogoffUser instruction prior V21.1. Improper input validation, allowing authenticated attackers with Actioner privileges to inject arbitrary commands. Exploitation enables remote execution of elevated commands on devices connected to the platform.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2025-64990?

It affects 1 product.


Products: Teamviewer Digital Employee Experience.

## How do I fix CVE-2025-64990?

No fix has been published for CVE-2025-64990 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-64990 being exploited?

There is no known exploitation of CVE-2025-64990 in the wild and no public exploit code.

## Other vulnerabilities in TeamViewer DEX

- [CVE-2025-44016](https://insights.sbomify.com/CVE-2025-44016/): File Hash Validation Bypass in NomadBranch.exe (high 8.8)
- [CVE-2025-64986](https://insights.sbomify.com/CVE-2025-64986/): Command Injection in 1E-Explorer-TachyonCore-DevicesListeningOnAPort Instruction (high 7.2)
- [CVE-2025-64987](https://insights.sbomify.com/CVE-2025-64987/): Command Injection in 1E-Explorer-TachyonCore-CheckSimpleIoC Instruction (high 7.2)
- [CVE-2025-64988](https://insights.sbomify.com/CVE-2025-64988/): Command Injection in 1E-Nomad-GetCmContentLocations Instruction (high 7.2)
- [CVE-2025-64989](https://insights.sbomify.com/CVE-2025-64989/): Command Injection in 1E-Explorer-TachyonCore-FindFileBySizeAndHash Instruction (high 7.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-64990 and fix it if it is affected.

What it is: CVE-2025-64990 is a medium-severity command injection vulnerability in TeamViewer DEX, published on 11 Dec 2025. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2025-64990 in the wild and no public exploit code.

Affected product: TeamViewer DEX. 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-2025-64990/ (Markdown: https://insights.sbomify.com/CVE-2025-64990/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-64990
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-64990
- OSV: https://osv.dev/vulnerability/CVE-2025-64990

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From sbomify Insights: https://insights.sbomify.com/CVE-2025-64990/
Summaries are generated and may contain mistakes; the official description above is the record.