# CVE-2018-4058: Server-side request forgery in coTURN

> An attacker can exploit the default TURN server configuration to relay traffic to the loopback interface, accessing private services on the host.

- **Severity:** High 7.7 (`CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 21 Mar 2019
- **Updated:** 5 Aug 2024
- **Also known as:** DEBIAN-CVE-2018-4058, GHSA-j75v-963h-65p5, UBUNTU-CVE-2018-4058

## What is CVE-2018-4058?

CVE-2018-4058 is a high-severity server-side request forgery vulnerability in Talos coTURN, published on 21 Mar 2019. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

An exploitable unsafe default configuration vulnerability exists in the TURN server functionality of coTURN prior to 4.5.0.9. By default, the TURN server allows relaying external traffic to the loopback interface of its own host. This can provide access to other private services running on that host, which can lead to further attacks. An attacker can set up a relay with a loopback address as the peer on an affected TURN server to trigger this vulnerability.

## Which versions are affected by CVE-2018-4058?

It affects 1 product.


Products: Coturn Project Coturn.

## How do I fix CVE-2018-4058?

Upgrade to a fixed version.

## Is CVE-2018-4058 being exploited?

There is no known exploitation of CVE-2018-4058 in the wild and no public exploit code.

## Other vulnerabilities in Talos coTURN

- [CVE-2018-4056](https://insights.sbomify.com/CVE-2018-4056/): SQL injection in coTURN (critical 9.1)
- [CVE-2026-43994](https://insights.sbomify.com/CVE-2026-43994/): Coturn: Stack buffer overflow in decode_oauth_token_gcm() (high 8.1)
- [CVE-2026-40613](https://insights.sbomify.com/CVE-2026-40613/): Coturn: Misaligned Memory Access in coturn STUN Attribute Parser (Remote DoS on ARM64) (high 7.5)
- [CVE-2026-53450](https://insights.sbomify.com/CVE-2026-53450/): Coturn: IPv4-mapped 127.0.0.1 bypasses default loopback peer protection (high 7.4)
- [CVE-2026-53448](https://insights.sbomify.com/CVE-2026-53448/): Coturn: SQL Injection in HTTPS Admin Panel Delete Operations (high 7.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-4058 and fix it if it is affected.

What it is: CVE-2018-4058 is a high-severity server-side request forgery vulnerability in Talos coTURN, published on 21 Mar 2019. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2018-4058 in the wild and no public exploit code.

Affected product: Talos coTURN. 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-2018-4058/ (Markdown: https://insights.sbomify.com/CVE-2018-4058/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-4058
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-4058
- OSV: https://osv.dev/vulnerability/CVE-2018-4058

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-4058/
Summaries are generated and may contain mistakes; the official description above is the record.