# CVE-2021-22749: Information disclosure in Modicon X80 BMXNOR0200H RTU SV1.70 IR22 and prior

> An attacker can send a crafted HTTP request to the Modicon X80 RTU web server to leak sensitive configuration and telemetry parameters.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/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:** 11 Jun 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-xmrj-wjpx-qx78

## What is CVE-2021-22749?

CVE-2021-22749 is a medium-severity vulnerability in Modicon X80 BMXNOR0200H RTU SV1.70 IR22 and prior, published on 11 Jun 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A CWE-200: Exposure of Sensitive Information to an Unauthorized Actor vulnerability exists in Modicon X80 BMXNOR0200H RTU SV1.70 IR22 and prior that could cause information leak concerning the current RTU configuration including communication parameters dedicated to telemetry, when a specially crafted HTTP request is sent to the web server of the module.

Weakness: CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor)

## Which versions are affected by CVE-2021-22749?

It affects 1 product.


Products: Schneider-Electric Modicon X80 Bmxnor0200h Rtu Firmware.

## How do I fix CVE-2021-22749?

No fix has been published for CVE-2021-22749 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-22749 being exploited?

There is no known exploitation of CVE-2021-22749 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-22749 and fix it if it is affected.

What it is: CVE-2021-22749 is a medium-severity vulnerability in Modicon X80 BMXNOR0200H RTU SV1.70 IR22 and prior, published on 11 Jun 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-2021-22749 in the wild and no public exploit code.

Affected product: Modicon X80 BMXNOR0200H RTU SV1.70 IR22 and prior. 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-2021-22749/ (Markdown: https://insights.sbomify.com/CVE-2021-22749/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-22749
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-22749
- OSV: https://osv.dev/vulnerability/CVE-2021-22749

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-22749/
Summaries are generated and may contain mistakes; the official description above is the record.