# CVE-2021-44513: Race condition in n/a

> A local attacker can compromise session integrity in tmate-ssh-server due to insecure temporary directory creation.

- **Severity:** High 7.0 (`CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **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:** Yes
- **Published:** 7 Dec 2021
- **Updated:** 4 Aug 2024
- **Also known as:** DEBIAN-CVE-2021-44513, GHSA-hhg7-mpgg-68qf, UBUNTU-CVE-2021-44513

## What is CVE-2021-44513?

CVE-2021-44513 is a high-severity vulnerability in n/a, published on 7 Dec 2021. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Insecure creation of temporary directories in tmate-ssh-server 2.3.0 allows a local attacker to compromise the integrity of session handling.

Weakness: CWE-362 (Concurrent Execution using Shared Resource with Improper Synchronization)

## Which versions are affected by CVE-2021-44513?

It affects 1 product.


Products: Tmate Tmate-Ssh-Server.

## How do I fix CVE-2021-44513?

Apply the vendor's patch.

## Is CVE-2021-44513 being exploited?

There is no known exploitation of CVE-2021-44513 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2021-44512](https://insights.sbomify.com/CVE-2021-44512/): Misconfiguration in n/a (high 7.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-44513 and fix it if it is affected.

What it is: CVE-2021-44513 is a high-severity vulnerability in n/a, published on 7 Dec 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-2021-44513 in the wild and no public exploit code.

Affected product: n/a. 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-2021-44513/ (Markdown: https://insights.sbomify.com/CVE-2021-44513/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-44513
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-44513
- OSV: https://osv.dev/vulnerability/CVE-2021-44513

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-44513/
Summaries are generated and may contain mistakes; the official description above is the record.