# CVE-2018-12087: Moderate severity vulnerability that affects OPCFoundation.NetStandard.Opc.Ua

> Attackers can decrypt passwords in OPC UA Client Applications if certificate validation is disabled during insecure communication.

- **Severity:** Medium 5.3 (`CVSS:3.0/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 3 Oct 2018
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-8336-mxp6-v5h9

## What is CVE-2018-12087?

CVE-2018-12087 is a medium-severity vulnerability in n/a, published on 3 Oct 2018. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Failure to validate certificates in OPC Foundation UA Client Applications communicating without security allows attackers with control over a piece of network infrastructure to decrypt passwords.

Weakness: CWE-295 (Improper Certificate Validation)

## Which versions are affected by CVE-2018-12087?

2 open source packages ship an affected version, including OPCFoundation.NetStandard.Opc.Ua. It affects 2 products.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `OPCFoundation.NetStandard.Opc.Ua` | NuGet | All versions | 1.4.353.15 |
| `OPCFoundation.NetStandard.Opc.Ua` | NuGet | All versions | 1.4.353.15 |

Products: Opcfoundation Ua-.Net-Legacy, Opcfoundation Ua-.Netstandard.

## How do I fix CVE-2018-12087?

Upgrade OPCFoundation.NetStandard.Opc.Ua to 1.4.353.15 or later.

## Is CVE-2018-12087 being exploited?

There is no known exploitation of CVE-2018-12087 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2017-12070](https://insights.sbomify.com/CVE-2017-12070/): Supply chain in n/a (high 8.8)
- [CVE-2018-12585](https://insights.sbomify.com/CVE-2018-12585/): XML external entity in n/a (high 8.2)
- [CVE-2021-27432](https://insights.sbomify.com/CVE-2021-27432/): Denial of service in OPC Foundation OPC UA .NET Standard and OPC UA .NET Legacy (high 7.5)
- [CVE-2018-7559](https://insights.sbomify.com/CVE-2018-7559/): OPC UA applications can allow a remote attacker to determine a Server's private key (medium 5.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-12087 and fix it if it is affected.

What it is: CVE-2018-12087 is a medium-severity vulnerability in n/a, published on 3 Oct 2018. 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-2018-12087 in the wild and no public exploit code.

Affected packages and fixed versions:
- OPCFoundation.NetStandard.Opc.Ua (NuGet): affected all versions; fixed in 1.4.353.15
- OPCFoundation.NetStandard.Opc.Ua (NuGet): affected all versions; fixed in 1.4.353.15

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-2018-12087/ (Markdown: https://insights.sbomify.com/CVE-2018-12087/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-12087
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-12087
- OSV: https://osv.dev/vulnerability/CVE-2018-12087

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-12087/
Summaries are generated and may contain mistakes; the official description above is the record.