# CVE-2021-35005: Information disclosure in TeamViewer

> Local attackers can disclose sensitive information via an out-of-bounds read in TeamViewer, potentially leading to arbitrary code execution with SYSTEM privileges.

- **Severity:** Low 3.3 (`CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N`)
- **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:** 24 Jan 2022
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-9j8g-8qg8-33fc

## What is CVE-2021-35005?

CVE-2021-35005 is a low-severity vulnerability in TeamViewer, published on 24 Jan 2022. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

This vulnerability allows local attackers to disclose sensitive information on affected installations of TeamViewer. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the TeamViewer service. The issue results from the lack of proper validation of user-supplied data, which can result in a read past the end of an allocated array. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of SYSTEM. Was ZDI-CAN-13818.

Weakness: CWE-125 (Out-of-bounds Read), CWE-129 (Improper Validation of Array Index)

## Which versions are affected by CVE-2021-35005?

It affects 1 product.


Products: Teamviewer Teamviewer.

## How do I fix CVE-2021-35005?

No fix has been published for CVE-2021-35005 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-35005 being exploited?

There is no known exploitation of CVE-2021-35005 in the wild and no public exploit code.

## Other vulnerabilities in TeamViewer

- [CVE-2019-18988](https://insights.sbomify.com/CVE-2019-18988/): TeamViewer Desktop Bypass Remote Login (high 7.0, exploited in the wild)
- [CVE-2018-16550](https://insights.sbomify.com/CVE-2018-16550/): Security feature bypass in n/a (critical 9.8)
- [CVE-2010-3128](https://insights.sbomify.com/CVE-2010-3128/): Path traversal in n/a (critical 9.3)
- [CVE-2020-13699](https://insights.sbomify.com/CVE-2020-13699/): Command injection in n/a (high 8.8)
- [CVE-2018-14333](https://insights.sbomify.com/CVE-2018-14333/): Information disclosure in n/a (high 8.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-35005 and fix it if it is affected.

What it is: CVE-2021-35005 is a low-severity vulnerability in TeamViewer, published on 24 Jan 2022. 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-2021-35005 in the wild and no public exploit code.

Affected product: TeamViewer. 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-2021-35005/ (Markdown: https://insights.sbomify.com/CVE-2021-35005/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-35005
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-35005
- OSV: https://osv.dev/vulnerability/CVE-2021-35005

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-35005/
Summaries are generated and may contain mistakes; the official description above is the record.