# CVE-2021-23858: Information disclosure

> Unauthenticated attackers can access sensitive configuration data, including user credentials and device details, from Rexroth motion controllers.

- **Severity:** High 8.6 (`CVSS:3.1/AV:N/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:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 4 Oct 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-9jpf-vg83-7m3q

## What is CVE-2021-23858?

CVE-2021-23858 is a high-severity vulnerability in Rexroth IndraMotion MLC L20, L40, published on 4 Oct 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Information disclosure: The main configuration, including users and their hashed passwords, is exposed by an unprotected web server resource and can be accessed without authentication. Additionally, device details are exposed which include the serial number and the firmware version by another unprotected web server resource.

Weakness: CWE-306 (Missing Authentication for Critical Functionality), CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor)

## Which versions are affected by CVE-2021-23858?

It affects 12 products.


Products: Bosch Indracontrol Xlc Firmware, Bosch Rexroth Indramotion Mlc L20 Firmware, Bosch Rexroth Indramotion Mlc L25 Firmware, Bosch Rexroth Indramotion Mlc L40 Firmware, Bosch Rexroth Indramotion Mlc L45 Firmware, Bosch Rexroth Indramotion Mlc L65 Firmware, Bosch Rexroth Indramotion Mlc L75 Firmware, Bosch Rexroth Indramotion Mlc L85 Firmware, Bosch Rexroth Indramotion Mlc Xm21 Firmware, Bosch Rexroth Indramotion Mlc Xm22 Firmware, Bosch Rexroth Indramotion Mlc Xm41 Firmware, Bosch Rexroth Indramotion Mlc Xm42 Firmware.

## How do I fix CVE-2021-23858?

No fix has been published for CVE-2021-23858 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-23858 being exploited?

There is no known exploitation of CVE-2021-23858 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-23858 and fix it if it is affected.

What it is: CVE-2021-23858 is a high-severity vulnerability in Rexroth IndraMotion MLC L20, L40, published on 4 Oct 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-2021-23858 in the wild and no public exploit code.

Affected product: Rexroth IndraMotion MLC L20, L40. 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-2021-23858/ (Markdown: https://insights.sbomify.com/CVE-2021-23858/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-23858
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-23858
- OSV: https://osv.dev/vulnerability/CVE-2021-23858

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-23858/
Summaries are generated and may contain mistakes; the official description above is the record.