# CVE-2021-40366: Information disclosure in Climatix POL909 (AWB module)

> Unencrypted web server traffic allows remote attackers to intercept or modify sensitive data, including administrator credentials, via man-in-the-middle attacks.

- **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:** 9 Nov 2021
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-49hc-75c3-5637

## What is CVE-2021-40366?

CVE-2021-40366 is a high-severity vulnerability in Siemens Climatix POL909 (AWB module), published on 9 Nov 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 Climatix POL909 (AWB module) (All versions < V11.42), Climatix POL909 (AWM module) (All versions < V11.34). The web server of affected devices transmits data without TLS encryption. This could allow an unauthenticated remote attacker in a man-in-the-middle position to read sensitive data, such as administrator credentials, or modify data in transit.

Weakness: CWE-319 (Cleartext Transmission of Sensitive Information), CWE-311 (Missing Encryption of Sensitive Data)

## Which versions are affected by CVE-2021-40366?

It affects 1 product.


Products: Siemens Climatix Pol909 Firmware.

## How do I fix CVE-2021-40366?

No fix has been published for CVE-2021-40366 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-40366 being exploited?

There is no known exploitation of CVE-2021-40366 in the wild and no public exploit code.

## Other vulnerabilities in Siemens Climatix POL909 (AWB module)

- [CVE-2021-41543](https://insights.sbomify.com/CVE-2021-41543/): Information disclosure in Climatix POL909 (AWB module) (medium 6.5)
- [CVE-2021-41541](https://insights.sbomify.com/CVE-2021-41541/): Cross-site scripting in Climatix POL909 (AWB module) (medium 6.1)
- [CVE-2021-41542](https://insights.sbomify.com/CVE-2021-41542/): Cross-site scripting in Climatix POL909 (AWB module) (medium 6.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-40366 and fix it if it is affected.

What it is: CVE-2021-40366 is a high-severity vulnerability in Siemens Climatix POL909 (AWB module), published on 9 Nov 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-2021-40366 in the wild and no public exploit code.

Affected product: Siemens Climatix POL909 (AWB module). 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-2021-40366/ (Markdown: https://insights.sbomify.com/CVE-2021-40366/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-40366
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-40366
- OSV: https://osv.dev/vulnerability/CVE-2021-40366

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-40366/
Summaries are generated and may contain mistakes; the official description above is the record.