# CVE-2021-31892: Weak cryptography in SINUMERIK Analyse MyCondition

> An attacker can perform a TLS man-in-the-middle attack due to missing server certificate validation in Siemens SINUMERIK software.

- **Severity:** High 7.4 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 13 Jul 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-wr99-8g6h-68jx

## What is CVE-2021-31892?

CVE-2021-31892 is a high-severity vulnerability in Siemens SINUMERIK Analyse MyCondition, published on 13 Jul 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability has been identified in SINUMERIK Analyse MyCondition (All versions), SINUMERIK Analyze MyPerformance (All versions), SINUMERIK Analyze MyPerformance /OEE-Monitor (All versions), SINUMERIK Analyze MyPerformance /OEE-Tuning (All versions), SINUMERIK Integrate Client 02 (All versions >= V02.00.12 < 02.00.18), SINUMERIK Integrate Client 03 (All versions >= V03.00.12 < 03.00.18), SINUMERIK Integrate Client 04 (V04.00.02 and all versions >= V04.00.15 < 04.00.18), SINUMERIK Integrate for Production 4.1 (All versions < V4.1 SP10 HF3), SINUMERIK Integrate for Production 5.1 (V5.1), SINUMERIK Manage MyMachines (All versions), SINUMERIK Manage MyMachines /Remote (All versions), SINUMERIK Manage MyMachines /Spindel Monitor (All versions), SINUMERIK Manage MyPrograms (All versions), SINUMERIK Manage MyResources /Programs (All versions), SINUMERIK Manage MyResources /Tools (All versions), SINUMERIK Manage MyTools (All versions), SINUMERIK Operate V4.8 (All versions < V4.8 SP8), SINUMERIK Operate V4.93 (All versions < V4.93 HF7), SINUMERIK Operate V4.94 (All versions < V4.94 HF5), SINUMERIK Optimize MyProgramming /NX-Cam Editor (All versions). Due to an error in a third-party dependency the ssl flags used for setting up a TLS connection to a server are overwitten with wrong settings. This results in a missing validation of the server certificate and thus in a possible TLS MITM szenario.

Weakness: CWE-295 (Improper Certificate Validation)

## Which versions are affected by CVE-2021-31892?

It affects 10 products.


Products: Siemens Sinumerik Analyse Mycondition Firmware, Siemens Sinumerik Analyze Myperformance Firmware, Siemens Sinumerik Integrate Client Firmware, Siemens Sinumerik Integrate for Production Firmware, Siemens Sinumerik Manage Mymachines Firmware, Siemens Sinumerik Manage Myprograms Firmware, Siemens Sinumerik Manage Myresources Firmware, Siemens Sinumerik Manage Mytools Firmware, Siemens Sinumerik Operate Firmware, Siemens Sinumerik Optimize Myprogramming Firmware.

## How do I fix CVE-2021-31892?

No fix has been published for CVE-2021-31892 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-31892 being exploited?

There is no known exploitation of CVE-2021-31892 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-31892 and fix it if it is affected.

What it is: CVE-2021-31892 is a high-severity vulnerability in Siemens SINUMERIK Analyse MyCondition, published on 13 Jul 2021. 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-2021-31892 in the wild and no public exploit code.

Affected product: Siemens SINUMERIK Analyse MyCondition. 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-2021-31892/ (Markdown: https://insights.sbomify.com/CVE-2021-31892/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-31892
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-31892
- OSV: https://osv.dev/vulnerability/CVE-2021-31892

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-31892/
Summaries are generated and may contain mistakes; the official description above is the record.