# CVE-2018-10066: Security feature bypass in n/a

> Missing OpenVPN certificate verification allows attackers to impersonate servers and access internal networks via site-to-site tunnels.

- **Severity:** High 8.1 (`CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 13 Apr 2018
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-vjgv-p598-g52v

## What is CVE-2018-10066?

CVE-2018-10066 is a high-severity vulnerability in Mikrotik Routeros, published on 13 Apr 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An issue was discovered in MikroTik RouterOS 6.41.4. Missing OpenVPN server certificate verification allows a remote unauthenticated attacker capable of intercepting client traffic to act as a malicious OpenVPN server. This may allow the attacker to gain access to the client's internal network (for example, at site-to-site tunnels).

Weakness: CWE-295 (Improper Certificate Validation)

## Which versions are affected by CVE-2018-10066?

It affects 1 product.


Products: Mikrotik Routeros.

## How do I fix CVE-2018-10066?

No fix has been published for CVE-2018-10066 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-10066 being exploited?

There is no known exploitation of CVE-2018-10066 in the wild and no public exploit code.

## Other vulnerabilities in Mikrotik Routeros

- [CVE-2018-7445](https://insights.sbomify.com/CVE-2018-7445/): MikroTik RouterOS Stack-Based Buffer Overflow (critical 9.8, exploited in the wild)
- [CVE-2026-86060](https://insights.sbomify.com/CVE-2026-86060/): MikroTik RouterOS Improper Neutralization of Argument Delimiters in a Command (critical 9.2, exploited in the wild)
- [CVE-2018-14847](https://insights.sbomify.com/CVE-2018-14847/): MikroTik Router OS Directory Traversal (critical 9.1, exploited in the wild)
- [CVE-2026-67277](https://insights.sbomify.com/CVE-2026-67277/): MikroTik RouterOS Missing Authentication for Critical Function (high 8.8, exploited in the wild)
- [CVE-2026-67279](https://insights.sbomify.com/CVE-2026-67279/): Mikrotik RouterOS Improper Enforcement of Behavioral Workflow (medium 6.9, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-10066 and fix it if it is affected.

What it is: CVE-2018-10066 is a high-severity vulnerability in Mikrotik Routeros, published on 13 Apr 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2018-10066 in the wild and no public exploit code.

Affected product: Mikrotik Routeros. 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-2018-10066/ (Markdown: https://insights.sbomify.com/CVE-2018-10066/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-10066
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-10066
- OSV: https://osv.dev/vulnerability/CVE-2018-10066

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From sbomify Insights: https://insights.sbomify.com/CVE-2018-10066/
Summaries are generated and may contain mistakes; the official description above is the record.